INTRODUCTION Polyserositis is described as inflammation with effusion of more than one serous membrane. There is very little published literature linking it to COVID-19 as a late complication.
OBJECTIVES Present and describe a case of post–COVID-19 polyserositis.
METHODS Data were collected from the medical record of a female patient admitted for fainting spells and marked weakness. The patient underwent a clinical evaluation, additional hematology, imaging and histopathology tests, and a surgical procedure.
The new index, called the abdominal adipose deposit index, was obtained by multiplying the subcutaneous fat thickness by visceral fat thickness, both measured by ultrasound. A cutoff point was established that facilitated discernment of an unhealthy phenotype: normal weight but metabolically obese, a cardiometabolic risk factor.
RESULTS We present the case of a 57-year-old female patient admitted to hospital for fainting spells and marked weakness, four months after COVID-19 infection. She also had a history of obesity, asthma, type 2 diabetes mellitus and a cholecystectomy in December 1992 for gallstones. Clinical assessment revealed pericardial effusion and bilateral pleural effusion, in addition to a tumor-like lesion outside the pericardium, proximal to the right ventricular wall. A surgical procedure and findings from additional tests led to diagnoses of thymic remnants and polyserositis.
CONCLUSIONS This is a case of polyserositis in a post–COVID-19 patient. After other causes of polyserositis were ruled out, and since there is a likely physiological and pathogenic mechanism operating between the two diseases, the polyserositis was determined to be a late complication of COVID-19. To date, it is the second case reported in the world and the first reported in Cuba.
KEYWORDS COVID-19, SARS-CoV-2, colchicine, pericardial effusion, pleural effusion, pericarditis, thoracoscopy, Cuba
Variant in Cuba July–October 2022, Vol 24, No 3–4
INTRODUCTION In November 2021, omicron—a new SARS-CoV-2 variant—was identified in South Africa and almost immediately, WHO declared it a ‘variant of concern’. In view of its rapid worldwide spread and its imminent introduction in Cuba, genomic surveillance was strengthened.
OBJECTIVES Describe cases during the first eight epidemiological weeks (epiweeks) of SARS-CoV-2 infection attributable to omicron variant in Cuba by clinical and epidemiological variables.
METHODS From epiweek 48, 2021 to epiweek 4, 2022, 288 nasopharyngeal swabs were processed for sequencing of a 1836 bp fragment of the S gene. Variants were identified according to GISAID database and confirmed by phylogenetic analysis. Variants’ association with clinical and epidemiological outcomes was assessed.
RESULTS The first cases of omicron variant were imported, mostly from African countries and the United States. During the period studied, omicron was detected in 83.0% (239/288) of cases processed, while the delta variant was found in 17.0% (49/288). Most persons infected with omicron were symptomatic (63.2%; 151/239) and fully vaccinated (65.3%; 156/239); severe cases and deaths occurred mainly among patients aged ≥65 years (92.9%; 13/14), and 12 of these deaths occurred in fully vaccinated persons (92.3%; 12/13). Omicron spread rapidly throughout the country (from 10% of cases in epiweek 48, 2021, to 100% by epiweek 4, 2022), displacing the formerly predominant delta variant.
CONCLUSIONS Omicron’s rapid expansion in Cuba was associated with increased incidence but not with a higher case fatality rate. The relatively milder disease in those infected with this variant could be influenced by the high vaccination coverage, along with the natural immunity acquired as a consequence of previous virus infection.
KEYWORDS Pandemics, epidemiology, epidemiological monitoring, COVID-19 testing, COVID-19, SARS-CoV-2, COVID-19 vaccines, Cuba
Might Explain Different Clinical Outcomes July–October 2022, Vol 24, No 3–4
Globally, SARS CoV-2 omicron variant has led to a notable increase of COVID-19 diagnoses, although with less severe clinical manifestations and decreased hospitalizations. The omicron wave swelled faster than previous waves, completely displacing the delta variant within weeks, and creating worldwide concern about final, successful pandemic control. Some authors contend that symptoms associated to omicron differ from ‘traditional’ symptoms and more closely resemble those of the common cold.
One major COVID-19 symptom frequent with other variants—loss of taste and smell—is rarely present with omicron. This may be of interest, since it has also been suggested that direct SARS-CoV-2 invasion into the brainstem through the olfactory nerves by transsynaptic pathways could provide one explanation for the acute respiratory distress syndrome refractory to treatment. Brainstem infection by SARS-CoV-2 can severely damage the respiratory center, triggering functional deviations that affect involuntary respiration, leading to acute respiratory distress syndrome refractory to treatment, the main cause of death in COVID-19 patients. A shift in the omicron SARS-CoV-2 entry pathway from cell-surface fusion, triggered by TMPRSS2, to cathepsin-dependent fusion within the endosome, may affect transmission, cellular tropism and pathogenesis. Therefore, we can hypothesize that this entrance modification may impact transmission from the olfactory nerve to the brainstem through transsynaptic pathways. A decrement of the virus’s direct invasion into the brainstem could diminish respiratory center dysfunction, reducing acute respiratory distress syndrome and the need for mechanical ventilation.
KEYWORDS SARS-CoV-2, COVID-19, olfactory nerve, COVID-19 pandemics, respiratory center, smell, anosmia, taste, ageusia, brain stem, cathepsins, endosomes
Hospital Admission July–October 2022, Vol 24, No 3–4
INTRODUCTION Bile acids are signaling molecules with immune, metabolic and intestinal microbiota control actions. In high serum concentrations they increase inflammatory response from the liver-gut axis, until causing multiorgan failure and death; therefore, they may be associated with COVID-19’s clinical progression, as a consequence of tissue and metabolic damage caused by SARS-CoV-2. While this topic is of considerable clinical interest, to our knowledge, it has not been studied in Cuba.
OBJECTIVES Study and preliminarily characterize patients admitted with a diagnosis of COVID-19 and high levels of serum bile acids.
METHODS A preliminary exploratory study was carried out with descriptive statistical techniques in 28 COVID-19 patients (17 women, 11 men; aged 19–92 years) who exhibited high levels of serum bile acids (≥10.1 µmol/L) on admission to the Dr. Luis Díaz Soto Central Military Hospital in Havana, Cuba, from September through November 2021.
RESULTS On admission patients presented hypocholesterolemia (13/28; 46.4%), hyperglycemia (12/28; 43.0%) and hyper gamma-glutamyl transpeptidase (23/28; 84.2%). Median blood glucose (5.8 mmol/L) and cholesterol (4.1 mmol/L) were within normal ranges (3.2‒6.2 mmol/L and 3.9‒5.2 mmol/L, respectively). Severe or critical stage was the most frequent (13/28) and median serum bile acids (31.6 µmol/L) and gamma-glutamyl transferase (108.6 U/L) averaged well above their respective normal ranges (serum bile acids: 0‒10 µmol/L; GGT: 9‒36 U/L). Arterial hypertension was the most frequent comorbidity (19/28; 67.9%).
CONCLUSIONS Severe or critical stage predominated, with serum bile acids and gamma-glutamyl transferase blood levels above normal ranges. The study suggests that serum bile acid is toxic at levels ≥10.1 µmol/L, and at such levels is involved in the inflammatory process and in progression to severe and critical clinical stages of the disease. In turn, this indicates the importance of monitoring bile acid homeostasis in hospitalized COVID-19 patients and including control of its toxicity in treatment protocols.
KEYWORDS COVID-19, SARS-CoV-2, bile acids and salts, gamma-glutamyl transferase, pregnant women, postpartum, Cuba
Need for Psychological Care and Support for Those Who Lost Loved Ones to COVID-19 July–October 2022, Vol 24, No 3–4
The COVID-19 pandemic has caused notable changes in all areas of our lives. Pandemic-coping strategies include attention and care at various levels, for different people and in various scenarios. Death is one of the most feared consequences of COVID-19 for both patients and their families; for the latter, the grief and adaptation processes to loss require that care for grievers be an important part of the public health response to the COVID-19 pandemic.
Grief from losses due to COVID-19 has distinctive features: it is not anticipatory (with virtually no time or progressive stages to facilitate adaptation to loss); closure or goodbyes are not possible (in-person social support decreases due to distancing to minimize risk of infection); it may affect various close relationships (a relevant predictor of complicated grief); it may imply stigmatization by peers, friends and neighbors; it is preceded by a period of absence of fluid and in-person communication between family members and the hospitalized patient; and those who break the news of the death are often professionals in red zones who are stressed and do not always have the skills or the ability to properly communicate bad news.
The death of a family member from COVID-19 generally causes an unexpected crisis in the family, which is already affected by the pandemic and its daily consequences. This has prompted an analysis of COVID-19 loss on family life and how best to mitigate its consequences.
During the COVID-19 pandemic, care and monitoring of the grief of family members and those who were close to the deceased require psychological action within a framework of comprehensive care, which demands preparation of healthcare professionals. Experiences described are taken from some actions developed in Cuba.
KEYWORDS Grief, psychology, death, attitude to death, COVID-19, SARS-CoV-2, Cuba
SARS-CoV-2 Infection in Havana, Cuba April 2022, Vol 24, No 2
INTRODUCTION COVID-19 sequelae, or the short-, medium-, and long-term manifestations of the disease are under continuous study. There are currently few reports on the evolution of hematological variables following a demonstrated absence of SARS-CoV-2 after infection.
OBJECTIVE Identify hematological alterations in Cuban adults recovered from SARS-CoV-2 infection, and their relation with disease severity.
METHODS We selected 348 persons recovered from COVID-19 residing in Havana, Cuba with an RT-PCR study negative for SARS-CoV-2 performed two weeks after hospital discharge; a structured survey was administered to obtain clinical–epidemiological data. Three groups were established according to COVID-19 clinical criteria: asymptomatic, mild/moderately symptomatic, and severely symptomatic, which, in turn, were divided according to hospital discharge date and blood sample collection date. We performed hemograms with differential leukocyte counts and compared results among groups. We then measured the associations between hematological variables, personal medical history, and relevant lifestyle habits (smoking).
RESULTS All hematological variables were within normal reference limits, although men from the group of severely ill patients had increased total leukocytes, neutrophils and lymphocytes, and decreased hemoglobin and eosinophils, which was also evident in those with a recovery time of 31–90 days.
CONCLUSIONS The relation between hematological variables and degree of clinical severity offers evidence as to persistence of systemic alterations (possibly inflammatory) associated with viral infection. Their identification and characterization can facilitate personalized patient followup and rehabilitation.
KEYWORDS COVID-19, SARS-CoV-2, hematology, leukocytosis, neutrophils, eosinophils, Cuba
on the Isle of Youth, Cuba April 2022, Vol 24, No 2
INTRODUCTION The use of various diagnostic techniques is increasingly common in pandemic scenarios. It is important to update evaluations of their metric properties in different times and settings.
OBJECTIVE Evaluate metric properties of a SARS-CoV-2 rapid antigen test relative to a reference standard.
METHODS We carried out a prospective evaluation study of the SARS-CoV-2 rapid antigen test as compared to the RT-PCR test, which is considered the reference standard. Our sample was comprised of 778 individuals, and we calculated sensitivity, specificity, predictive values, prevalence and validity indices.
RESULTS Of the total 778 samples, 70 were true positives, 658 were true negatives, and 27 were false negatives when compared to RT-PCR test results. We obtained a sensitivity of 75.3% (95% CI = 65.96–84.50); a specificity of 96.1% (95% CI = 94.53–97.59); 72.2% for positive predictive value, and 96.6% for negative predictive value. The estimated prevalence was 11.9% and the validity index was 93.6%.
CONCLUSIONS The index values validate use of the SARS- CoV-2 rapid antigen test until prevalence falls below 2.5%, since as SARS-CoV-2 infection prevalence decreases, so does the predictive value of the PCR result.
The use of the SARS-CoV-2 rapid antigen test on the Isle of Youth, Cuba, was decisive in the pandemic’s clinical– epidemiological management.
KEYWORDS SARS-CoV-2, COVID-19, antigens, validation study, sensitivity and specificity, Cuba
We discuss the suitability of innate immune stimulation in acute respiratory infection post-exposure prophylaxis. The induction of innate immunity can be used to reduce susceptibility to immune-evasive pathogens (coronavirus, influenza virus, respiratory syncytial virus and rhinovirus). After the emergence of multiple SARS-CoV-2 variants, scientists are debating whether new variants could affect vaccine efficacy and how antigens could be redesigned to compensate. In addition, there is insufficient vaccine production to cover universal demand, and equitable vaccine distribution is a global challenge. Given these factors, non-specific immune stimulators may be suitable for a quick first response in the case of a suspected or early respiratory infection. Our group completed several HeberNasvac studies in healthy volunteers and patients with respiratory infections, and is currently starting large clinical trials in patients with early SARS-CoV-2 infections. This nasal formulation of hepatitis B vaccine has demonstrated its capacity to stimulate innate immunity markers (TLR3, TLR7 and TLR8 in tonsils) at the virus’ entry site, in systemic compartments (HLA class II in monocytes and lymphocytes) and in the activation of dendritic cells, lymphocytes and other cell lines in vitro and ex vivo. In addition, research generated by the current pandemic may obtain results useful for treating other acute respiratory infections, which have long been main drivers of mortality among older adults and in early childhood.
KEYWORDS Immunity, innate; toll-like-receptors; SARS-CoV-2; COVID-19; respiratory tract infections; Cuba
ABSTRACT
INTRODUCTION SARS-CoV-2 infection can produce endothelial injury and microvascular damage, one cause of the multiorgan failure associated with COVID-19. Cerebrovascular endothelial damage increases the risk of stroke in COVID-19 patients, which makes prompt diagnosis important. Endothelial dysfunction can be evaluated by using transcranial Doppler ultrasound to study cerebral hemodynamic reserve, but there are few of these studies in patients with COVID-19, and the technique is not included in COVID-19 action and follow-up guidelines nationally or internationally.
OBJECTIVE Estimate baseline cerebral hemodynamic patterns, cerebral hemodynamic reserve, and breath-holding index in recovered COVID-19 patients.
METHOD We conducted an exploratory study in 51 people; 27 men and 24 women 20–78 years of age, divided into two groups. One group comprised 25 recovered COVID-19 patients, following clinical and epidemiological discharge, who suffered differing degrees of disease severity, and who had no neurological symptoms or disease at the time they were incorporated into the study. The second group comprised 26 people who had not been diagnosed with COVID-19 and who tested negative by RT-PCR at the time of study enrollment. Recovered patients were further divided into two groups: those who had been asymptomatic or had mild disease, and those who had severe or critical disease. We performed transcranial Doppler ultrasounds to obtain baseline and post-apnea tests of cerebral hemodynamic patterns to evaluate cerebral hemodynamic reserve and breath-holding indices. We characterized the recovered patient group and the control group through simple descriptive statistics (means and standard deviations).
RESULTS There were no measurable differences in baseline cerebral hemodynamics between the groups. However, cerebral hemodynamic reserve and breath-holding index were lower in those who had COVID-19 than among control participants (19.9% vs. 36.8% and 0.7 vs. 1.2 respectively). These variables were similar for patients who had asymptomatic or mild disease (19.9% vs.19.8%) and for those who had severe or critical disease (0.7 vs. 0.7).
CONCLUSIONS Patients recovered from SARS-CoV-2 infection showed decreased cerebral hemodynamic reserve and breath-holding index regardless of the disease’s clinical severity or presence of neurological symptoms. These abnormalities may be associated with endothelial damage caused by COVID-19. It would be useful to include transcranial Doppler ultrasound in evaluation and follow-up protocols for patients with COVID-19.
Keywords: SARS-CoV-2; COVID-19; breath holding; ultrasonography, Doppler, transcranial; endothelium, vascular; cerebrovascular circulation; Cuba
INTRODUCTION The percentage of asymptomatic COVID-19 cases worldwide is estimated at 18–50%; 53% in Cuba specifically, and 58% in Havana, the Cuban capital and the 2020 epicenter of the country’s COVID-19 epidemic. These figures, however, do not represent the transmission capacity or behavior of asymptomatic cases. Understanding asymptomatic transmission’s contribution to SARS-CoV-2 spread is of great importance to disease control and prevention.
OBJECTIVE Identify the epidemiological implications of asymptomatic SARS-CoV-2 infection in Havana, Cuba, during the first wave of the epidemic in 2020.
METHODS We carried out a cross-sectional study of all confirmed COVID-19 cases diagnosed in Havana, Cuba, from March 16 through June 30, 2020. The information was obtained through review of the standardized form for investigation of suspected and confirmed cases. Examined variables included age, sex, occupation, case type and source of infection. Cases were divided into asymptomatic and symptomatic groups, and transmission was characterized through the creation of a contact matrix. Analysis was carried out in Epidat and R.
RESULTS We studied 1287 confirmed cases, of which 57.7% (743) were asymptomatic, and 42.3% (544) were symptomatic. Symptomatic presentation was the most common for both imported and introduced cases, while asymptomatic presentation was more common in autochthonic cases and infections from an undetermined source. Asymptomatic infection was more common in groups aged <20 and 20–59 years, while symptomatic infection was more common in those aged >60 years. In the contact matrix, 34.6% of cases (445/1287) were not tied to other cases, and 65.4% (842/1287) were infectious–infected dyads, with symptomatic–symptomatic being the most common combination. The majority of primary cases (78.5%; 1002/1276) did not generate secondary cases, and 85.6% (658/743) of asymptomatic cases did not lead to other cases (although one asymptomatic superspreader led to 90 cases in a single event). However, 63.2% (344/544) of symptomatic primary cases generated secondary cases, and 11 symptomatic superspreaders spawned 100 secondary cases in different events.
CONCLUSIONS Asymptomatic SARS-CoV-2 infection was the most common form of COVID-19 in Havana during the study period, but its capacity for contagion was lower than that of symptomatic individuals. Superspreader events under specific conditions played an important role in sustaining the epidemic.
KEYWORDS COVID-19, SARS-CoV-2, pandemics, asymptomatic infection, Cuba
One of the most dreadful complications that can occur during the course of COVID-19 is the cytokine storm—also known as cytokine release syndrome—a form of systemic inflammatory response syndrome triggered by SARS-CoV-2 infection.
The cytokine storm is an activation cascade of auto-amplifying cytokines, which leads to excessive activation of immune cells and generation of pro-inflammatory cytokines. It occurs when large numbers of white blood cells are activated and release inflammatory cytokines, in turn activating even more white blood cells, finally resulting in an exaggerated pro-inflammatory–mediated response and ineffective anti-inflammatory control, leading to tissue damage, multiorgan failure, acute respiratory distress syndrome and death. Although cytokine storm pathogenesis is multifactorial, we hypothesize there is a close association between hypoxemia and cytokine storms in COVID-19, although it is difficult to establish the direction of this relationship. Most probably they coexist and, given enough time, one triggers the other in a chain reaction. Careful analysis of the day-to-day clinical evolution of COVID-19 indicates that there are short and slight periods of hypoxemia (confirmed by pulse oximetry and arterial gasometry), even on the day of the onset of persistent cough and/or shortness of breath.
We propose the use of continuous positive airway pressure in early stages of COVID-19, at the onset of respiratory symptoms. This non-invasive ventilation method may be useful in individualized treatments to prevent early hypoxemia in COVID-19 patients and thus avoid triggering a cytokine storm.
We believe such an approach is relevant everywhere, and in Cuba in particular, since the country has initiated national production of mechanical ventilation systems, including non-invasive ventilators. Moreover, as Cuba’s COVID-19 protocols ensure early patient admission to isolation centers or hospitals, clinicians can prescribe the early use of continuous positive airway pressure as soon as respiratory symptoms begin, averting early hypoxemia and its triggering effect on cytokine storm development, and consequently, avoiding acute respiratory distress syndrome, multi-organ failure, and death.
KEYWORDS COVID-19, SARS-CoV-2, cytokine release syndrome, respiratory distress syndrome, noninvasive ventilation, continuous positive airway pressure, Cuba
The COVID-19 pandemic has had an impact worldwide with regions experiencing varying degrees of severity. African countries have mounted different response strategies eliciting varied outcomes. Here, we compare these response strategies in Rwanda, South Africa and Zimbabwe and discuss lessons that could be shared. In particular, Rwanda has a robust and coordinated national health system that has effectively contained the epidemic. South Africa has considerable testing capacity, which has been used productively in a national response largely funded by local resources but affected negatively by corruption. Zimbabwe has an effective point-of-entry approach that utilizes an innovative strategic information system. All three countries would benefit having routine meetings to share experiences and lessons learned during the COVD-19 pandemic.
KEYWORDS COVID-19, SARS-CoV-2, epidemics, pandemic, Africa, Zimbabwe, Rwanda, South Africa
INTRODUCTION COVID-19 is caused by the novel coronavirus SARS-CoV-2 and was declared a pandemic on March 11, 2020, the same day that the first cases in Cuba were diagnosed. In Cuba, all confirmed cases of COVID-19 were hospitalized from this point forward.
OBJECTIVE Characterize the first patients diagnosed with COVID-19 in Cuba.
METHODS We carried out a descriptive, cross-sectional study of 415 suspected cases of COVID-19 admitted to the Pedro Kourí Tropical Medicine Institute in Havana, Cuba, from March 11, 2020 through April 10, 2020. (In Cuba, all patients suspected of being COVID-19–positive were admitted to hospitals or isolation centers for observation and treatment.) Of these 415 individuals, 63 (15.2%) tested positive for SARS-CoV-2. Information was obtained from the Institute’s databases as well as a standardized interview form for cases confirmed or suspected as infected with the novel coronavirus. We considered the following variables: age, sex, occupation at the time of interview, national origin, personal health history, time elapsed between symptom onset and hospital admission, signs and symptoms, diagnosis and status at discharge. We based our analysis on frequency distributions and double-entry contingency tables.
RESULTS The mean age was 50 years (range: 16–94 years). The 45–54 age group represented the largest share of cases (25.4%; 16/63); persons aged ≥65 years were 20.6% (13/63); there were more men than women (55.6% vs. 44.4%). Cubans represented 52.4% (33/63) of patients while 47.6% (30/63) were from 14 countries where COVID-19 had already been identified. All foreigners and Cubans who arrived from abroad were considered imported cases (54.0%; 34/63). Health personnel (10 doctors and 1 nurse) represented 17.5% (11/63) of cases. Cough (50.8%), fever (46.0%), sore throat (22.2%) and headache (19.0%) were the most frequently reported symptoms. Asymptomatic patients represented 25.4% (16/63) of cases. Hypertension was the most frequently associated chronic disease (28.6%), followed by asthma (25.0%) and diabetes (17.9%). Patients who were admitted to hospital ≥3 days after symptom onset represented 66.7% (42/63) of cases. Mean hospital stay was 13.7 days (range: 1–27 days). Factors associated with a higher risk of contracting the disease included occupation as a healthcare worker (OR: 1.85; 95%, CI: 0.88–3.87) and aged ≥65 years (OR: 1.68; 95% CI: 0.85–3.34). Five individuals died, for a fatality rate of 7.9% (three foreigners and two Cubans; four men and one woman). Four of these patients were infected outside of Cuba and one was identified as a contact of a confirmed case. All patients who died had significant comorbidities (diabetes, asthma and hypertension). Age of deceased patients ranged from 54 to 87 years.
CONCLUSION The first patients diagnosed with COVID-19 in Cuba were admitted to the Pedro Kourí Tropical Medicine Institute in Havana. They share characteristics with those reported by other countries: more men than women were affected, and comorbidities including hypertension, diabetes and asthma were all important risk factors, as was age ≥65 years. More than half of all cases were imported, and autochthonous patients were all contacts of confirmed cases.
KEYWORDS Pandemics, COVID-19, SARS-CoV-2, Cuba
A neuroinvasive respiratory coronavirus, SARS-CoV-2 causes a variety of neurological responses in patients. These include dizziness, headache, myalgias, hypogeusia, hyposmia, polyneuropathy, myositis, cerebrovascular disease, encephalitis and encephalopathy. Such susceptibility of the central nervous system (CNS) to the virus has spurred interest in neuropsychological research in COVID-19 patients and convalescents. Earlier health crises provide evidence confirming […]
INTRODUCTION Advanced age and chronic disease comorbidities are indicators of poor prognosis in COVID-19 clinical progression. Fatal outcomes in patients with these characteristics are due to a dysfunctional immune response. Understanding COVID-19’s immunopathogenesis helps in designing strategies to prevent and mitigate complications during treatment.
OBJECTIVE Describe the main immunopathogenic alterations of COVID-19 in patients of advanced age or with chronic non-communicable diseases. DATA
ACQUISITION We carried out a bibliographic search of primary references in PubMed, Elsevier, Science Direct and SciELO. A total of 270 articles met our initial search criteria. Duplicate articles or those unrelated to at least one chronic comorbidity, senescence or inflammation and those that studied only patient clinical characteristics, laboratory tests or treatments were excluded. Finally, our selection included 124 articles for analysis: 10 meta-analyses, 24 original research articles, 67 review articles, 9 editorials, 9 comments, 3 books and 2 websites.
DEVELOPMENT Hypertension and diabetes mellitus are the most common comorbidities in COVID-19 patients. Risk of developing severe manifestations of the disease, including death, is increased insenescent and obese patients and those with cardiovascular disease, cancer or chronic obstructive pulmonary disease. Low-grade chronic inflammation is characteristic of all these conditions, reflected in a pro-inflammatory state, endothelial dysfunction, and changes to innate immunity; mainly of the monocyte-macrophage system with changes in polarization, inflammation, cytotoxicity and altered antigenic presentation. In the case of SARS-CoV-2 infection, mechanisms involved in acute inflammation overlap with the patient’s pro-inflammatory state, causing immune system dysfunction. SARS-CoV-2 infection amplifies already-existing alterations, causing failures in the immune system’s control mechanisms. The resulting cytokine storm causes an uncontrolled systemic inflammatory response marked by high serum levels of inflammatory biomarkers and a pro-inflammatory cytokine profile with decompensation of underlying diseases. In asthma, chronic eosinophilic inflammation protects against infection by producing a reduced interferon-mediated response and a reduced number of ACE2 receptors.
CONCLUSIONS Low-grade chronic inflammation present in advanced age and chronic diseases—but not in bronchial asthma—produces a pro-inflammatory state that triggers a dysregulated immune response, favoring development of severe forms of COVID-19 and increasing lethality.
KEYWORDS SARS-CoV-2, COVID-19, inflammation, aging, chronic disease, immune system
INTRODUCTION Both intrauterine and intrapartum mother-to-child transmission of SARS-CoV-2 have been reported. However, there is still disagreement as to the likelihood and frequency of such vertical transmission.
OBJECTIVE Summarize and analyze the published evidence on forms of SARS-CoV-2 vertical transmission (either intrauterine or intrapartum).
EVIDENCE ACQUISITION We carried out a review of literature published in English and Spanish from January 1, 2020 through October 30, 2020. Search engines included PubMed/MEDLINE, SciELO, LILACS, Cochrane, Google Scholar, ResearchGate and medRxiv. There were no restrictions concerning type of study. The review included 48 original research articles, 11 review articles, a meta-analysis, 2 pre-published articles, 15 systematic reviews, and 10 editorials or comments.
DEVELOPMENT Medical thinking on congenital or intrapartum maternal–fetal/neonatal transmission of SARS-CoV-2 has evolved from preliminary evidence that was divided as to whether these forms of vertical transmission were even possible to current evidence support ing both forms of transmission and hypothesizing as to the mechanisms that guide them. The presence of the SARS-CoV-2 virus in maternal, placental, fetal or neonatal tissues has been demonstrated by RT-PCR, specific immunoglobulin detection tests, immunostaining and in-situ hybridization. It is estimated that infections acquired either congenitally or intrapartum occur in 1.8%–8.0% of newborns born to women who test positive for COVID-19 at the end of their pregnancies. This review found 53 neonates who were diagnosed with COVID-19 in the first 48 hours of life by either RT-PCR or specific IgM tests. According to criteria outlined in this review, the timing of infection corresponded to congenital or intrapartum transmission in 39.6% (21/53) of COVID-19–positive newborns, to postpartum transmission in 15.1% (8/53) and remains unspecified in 45.3% (24/53).
CONCLUSIONS Congenital and intrapartum SARS-CoV-2 infection in the fetus/newborn is possible, but rare. International collaborative studies using common epidemiological surveillance instruments would allow for a more precise specification of the frequency of congenital and intrapartum SARS-CoV-2 infection at the population level.
KEYWORDS COVID-19; SARS-CoV-2; vertical transmission of infectious disease; infant, newborn
