COVID-19, a worldwide public health emergency

Epidemiología y nuevos métodos de estimación del riesgo, en casos de pandemias: COVID-19

Durante el periodo de la pandemia por la COVID-19 se han realizado importantes intervenciones conductuales, clínicas y estatales en busca de mitigar y prevenir la persistencia del virus en la población humana. No obstante, aún no existe claridad de cómo estas intervenciones sin precedentes, incluidas las restricciones de viaje, afectaron la propagación de la COVID-19 en China y en otros países. Por ello, el objetivo de la presente investigación fue describir las principales características epidemiológicas de la COVID-19, a través del análisis de las principales medidas establecidas. Se utilizaron datos de 40 artículos científicos referentes a la pandemia y al virus, considerando información de relevancia respecto a este, como su comportamiento, sintomatología, epidemiología, tratamiento y métodos de mitigación a nivel mundial, así como un plan de medidas de control que se propuso en Perú para mitigar la propagación comunitaria de la enfermedad por coronavirus 2019 y poder estar preparado para futuras enfermedades de igual o mayor proporción que la actual.

Differential risk for COVID-19 in the first wave of the disease among Spaniards and migrants from different areas of the world living in Spain

INTRODUCTION AND OBJECTIVES

Little is known regarding the relevance of racial/ethnic background to the risk for COVID-19 infection, particularly in Europe. We evaluated the risk of COVID-19 among migrants from different areas of the world within the context of universal free access to medical care.

MATERIAL AND METHODS

We conducted a population-based cohort analysis of the cumulative incidence of PCR-confirmed COVID-19 among adult residents of Alcorcon (Spain) in the first wave of the disease up to April 25, 2020.

RESULTS

The crude cumulative incidence among migrants (n=20,419) was higher than among Spaniards (n=131,599): 8.81 and 6.51 and per 1,000 inhabitants, respectively (p<.001), but differed by region of origin. As per a negative binomial regression adjusted for age and sex, relative risk (RR) for COVID-19 for individuals from Europe, Asia, or North Africa was not significantly different from Spaniards. In contrast, a markedly increased risk was found for people from Sub-Saharan Africa (RR 3.66, 95% confidence interval (CI) 1.42-9.41, p=.007), the Caribbean (RR 6.35, 95% CI 3.83-10.55, p<.001), and Latin America (RR 6.92, 95% CI 4.49-10.67, p<.001).

CONCLUSIONS

Migrants from Sub-Saharan Africa, the Caribbean, and Latin America exhibited increased risk for COVID-19 as compared to Spaniards or migrants from Europe, North Africa, or Asia. Our data suggest that the ethnic background may play a role in risk for COVID-19. Migrants from some areas of the world may merit closer attention for both clinical and epidemiological reasons.

Prediction of confirmed cases of and deaths caused by COVID-19 in Chile through time series techniques: A comparative study

BACKGROUND

Chile has become one of the countries most affected by COVID-19, a pandemic that has generated a large number of cases worldwide. If not detected and treated in time, COVID-19 can cause multi-organ failure and even death. Therefore, it is necessary to understand the behavior of the spread of COVID-19 as well as the projection of infections and deaths. This information is very relevant so that public health organizations can distribute financial resources efficiently and take appropriate containment measures. In this research, we compare different time series methodologies to predict the number of confirmed cases of and deaths from COVID-19 in Chile.

METHODS

The methodology used in this research consisted of modeling cases of both confirmed diagnoses and deaths from COVID-19 in Chile using Autoregressive Integrated Moving Average (ARIMA henceforth) models, Exponential Smoothing techniques, and Poisson models for time-dependent count data. Additionally, we evaluated the accuracy of the predictions using a training set and a test set.

RESULTS

The dataset used in this research indicated that the most appropriate model is the ARIMA time series model for predicting the number of confirmed COVID-19 cases, whereas for predicting the number of deaths from COVID-19 in Chile, the most suitable approach is the damped trend method.

CONCLUSION

The ARIMA models are an alternative to modeling the behavior of the spread of COVID-19; however, depending on the characteristics of the dataset, other methodologies can better predict the behavior of these records, for example, the Holt-Winter method implemented with time-dependent count data.

The safety and immunogenicity of an inactivated SARS-CoV-2 vaccine in Chinese adults aged 18-59 years: A phase I randomized, double-blinded, controlled trial

Background

This study examined the safety and immunogenicity of an inactivated SARS-CoV-2 vaccine.

Method

In a phase I randomized, double-blinded, placebo-controlled trial involving 192 healthy adults 18–59 years old, two injections of three doses (50 EU, 100 EU, 150 EU) of an inactivated SARS-CoV-2 vaccine or placebo were administered intramuscularly at a 2- or 4-week interval. The safety and immunogenicity of the vaccine were evaluated.

Results

Vaccination was completed in 191 subjects. Forty-four adverse reactions occurred within 28 days, most commonly mild pain and redness at the injection site or slight fatigue. At days 14 and 28, the seroconversion rates were 87.5% and 79.2% (50 EU), 100% and 95.8% (100 EU), and 95.8% and 87.5% (150 EU), respectively, with geometric mean titers (GMTs) of 18.1 and 10.6, 54.5 and 15.4, and 37.1 and 18.5, respectively, for the schedules with 2-week and 4-week intervals. Seroconversion was associated with synchronous upregulation of antibodies against the S protein, N protein and virion and a cytotoxic T lymphocyte (CTL) response. No cytokines and immune cells related to immunopathology were observed. Transcriptome analysis revealed the genetic diversity of immune responses induced by the vaccine.

Interpretation

In a population aged 18–59 years in this trial, this inactivated SARS-CoV-2 vaccine was safe and immunogenic.

Trial registration: CTR20200943 and NCT04412538.

Factores psicosociales en estudiantes universitarios de Loreto, Ancash, Moquegua y Puno durante el confinamiento por el Covid-19, Perú

The study was carried out with the objective of comparing and analyzing psychosocial factors such as stress, depression and anxiety in undergraduate university students from Loreto, Ancash, Moquegua and Puno during confinement by Covid-19, Peru. The study was based on a non-experimental, quantitative-descriptive, cross-sectional and correlational design with non-probability and intentional sampling, an online survey was applied to a sample of 665 undergraduate students using validated instruments such as the List of Indicators of Vulnerability to stress, the Zung Depression Scale, and the Hamilton Anxiety Scale. The study reports vulnerability to stress in 50.8%, 46.3%, 36.4% and 37.5% in Loreto, Ancash, Moquegua and Puno. The prevalence of depression was 100.0%, 97.6%, 96.9% and 95.2% between mild, moderate and severe; likewise, 100.0% presented anxiety symptoms. It was concluded that a situation of obligatory social confinement is directly related to the presence of stress, depression and anxiety, particularly in undergraduate university students, affecting a greater proportion of women; of these between 19 and 22 years, and with a higher incidence in regions with a greater number of confirmed cases; where insomnia, worry and irritability are the most significant symptoms.

Differential risk for COVID-19 in the first wave of the disease among Spaniards and migrants from different areas of the world living in Spain

INTRODUCTION AND OBJECTIVES

Little is known regarding the relevance of racial/ethnic background to the risk for COVID-19 infection, particularly in Europe. We evaluated the risk of COVID-19 among migrants from different areas of the world within the context of universal free access to medical care.

MATERIALS AND METHODS

We conducted a population-based cohort analysis of the cumulative incidence of PCR-confirmed COVID-19 among adult residents of Alcorcon (Spain) in the first wave of the disease up to April 25, 2020.

RESULTS

The crude cumulative incidence among migrants (n = 20419) was higher than among Spaniards (n = 131599): 8.81 and 6.51 and per 1000 inhabitants, respectively (p <  .001), but differed by region of origin. As per a negative binomial regression adjusted for age and sex, relative risk (RR) for COVID-19 for individuals from Europe, Asia, or North Africa was not significantly different from Spaniards. In contrast, a markedly increased risk was found in people from Sub-Saharan Africa (RR 3.66, 95% confidence interval (CI) 1.42-9.41, p =  .007), the Caribbean (RR 6.35, 95% CI 3.83-10.55, p <  .001), and Latin America (RR 6.92, 95% CI 4.49-10.67, p <  .001).

CONCLUSIONS

Migrants from Sub-Saharan Africa, the Caribbean, and Latin America exhibited increased risk for COVID-19 as compared to Spaniards or migrants from Europe, North Africa, or Asia. Our data suggest ethnic background may play a role in risk for COVID-19. Migrants from some areas of the world may merit closer attention for both clinical and epidemiological reasons.

Predictors of Threat from COVID-19: A Cross-Sectional Study in the Spanish Population

One of the first measures for fighting the worldwide spread of the COVID-19 pandemic is social isolation or quarantine. The perceived threat from COVID-19 in this situation, maintained over time, generates uncertainty and fears, etc., which could lead to mental disorders in the population. This study evaluated the perceived threat from COVID-19 in the Spanish population. The study design was cross-sectional and observational. The sample of 1014 participants recruited in Spain had a mean age of 40.87 (SD = 12.42). The gender distribution was 67.2% (n = 681) women and 32.8% (n = 333) men. Data were collected with an online survey. The instrument used was the Perception of Threat from COVID-19 Questionnaire, validated for the Spanish population. Our data showed a clear correlation between perceived threat with female gender, having children in one's care and level of education. However, no association was observed with age or marital status. Finally, we concluded that there is a greater perception of threat from COVID-19 by women with a lower education who have children in their care, and that they are also more sensitive to minor mental disorders, such as anxiety or stress, appearing.

A multiplex chemiluminescent immunoassay for serological profiling of COVID-19-positive symptomatic and asymptomatic patients

The COVID-19 pandemic affects more than 81 million people worldwide with over 1.7 million deaths. As the population returns to work, it is critical to develop tests that reliably detect SARS-CoV-2-specific antibodies. Here we present results from a multiplex serology test for assessing the antibody responses to COVID-19. In an initial large cohort, this test shows greater than 99% agreement with COVID-19 PCR test. In a second outpatient cohort consisting of adults and children in Colorado, the IgG responses are more robust in positive/symptomatic participants than in positive/asymptomatic participants, the IgM responses in symptomatic participants are transient and largely fall below the detection limit 30 days after symptom onset, and the levels of IgA against SARS-CoV-2 receptor binding domain are significantly increased in participants with moderate-to-severe symptoms compared to those with mild-to-moderate symptoms or asymptomatic individuals. Our results thus provide insight into serology profiling and the immune response to COVID-19.

The Impact of COVID-19 Quarantine on Patients With Dementia and Family Caregivers: A Nation-Wide Survey

INTRODUCTION

Previous studies showed that quarantine for pandemic diseases is associated with several psychological and medical effects. The consequences of quarantine for COVID-19 pandemic in patients with dementia are unknown. We investigated the clinical changes in patients with Alzheimer's disease and other dementias, and evaluated caregivers' distress during COVID-19 quarantine.

METHODS

The study involved 87 Italian Dementia Centers. Patients with Alzheimer's Disease (AD), Dementia with Lewy Bodies (DLB), Frontotemporal Dementia (FTD), and Vascular Dementia (VD) were eligible for the study. Family caregivers of patients with dementia were interviewed by phone in April 2020, 45 days after quarantine declaration. Main outcomes were patients' changes in cognitive, behavioral, and motor symptoms. Secondary outcomes were effects on caregivers' psychological features.

RESULTS

4913 patients (2934 females, 1979 males) fulfilled the inclusion criteria. Caregivers reported a worsening in cognitive functions in 55.1% of patients, mainly in subjects with DLB and AD. Aggravation of behavioral symptoms was observed in 51.9% of patients. In logistic regression analysis, previous physical independence was associated with both cognitive and behavioral worsening (odds ratio 1.85 [95% CI 1.42-2.39], 1.84 [95% CI 1.43-2.38], respectively). On the contrary, pandemic awareness was a protective factor for the worsening of cognitive and behavioral symptoms (odds ratio 0.74 [95% CI 0.65-0.85]; and 0.72 [95% CI 0.63-0.82], respectively). Approximately 25.9% of patients showed the onset of new behavioral symptoms. A worsening in motor function was reported by 36.7% of patients. Finally, caregivers reported a high increase in anxiety, depression, and distress.

CONCLUSION

Our study shows that quarantine for COVID-19 is associated with an acute worsening of clinical symptoms in patients with dementia as well as increase of caregivers' burden. Our findings emphasize the importance to implement new strategies to mitigate the effects of quarantine in patients with dementia.

Clinical characteristics of older patients with COVID-19: a systematic review of case reports

In the context of the current COVID-19 pandemic, higher morbidity and mortality have been reported in older adults. This age group presents physiological changes and its own clinical conditions such as frailty, dementia, among others.

OBJECTIVE

To describe the characteristics of COVID-19 patients, both over and under 80 years old, by conducting a systematic review of the literature describing case reports, and to summarize and critically assess these characteristics.

METHODS

Systematic review. The study was registered on the Registry of Health Research Projects (PRISA) of the Peruvian National Institute of Health (code EI00000631). Five electronic databases (Scopus, PubMed, PubMed Central, LILACS, and SCIELO) were systematically searched during the period between December 31, 2019 and April 16, 2020. The search focused on case reports, case studies, and case series of older people with COVID-19 infection aged over or under 80 years. When selecting the cases, priority was given to clinical and epidemiological profile, laboratory and imaging patterns, and comprehensive geriatric evaluation.

RESULTS

1,149 articles were identified; after applying the filters, a total of 15 publications of case reports and complete records of 27 older adults were obtained. The most frequent age group was between 60 to 69 years old. There is little literature regarding case reports of older adults aged over 80 years. The most frequent parameters were hypertension, fever, cough, respiratory distress, ground-glass opacification in chest radiography and tomography. Furthermore, decrease in PaO2/FiO2 ratio and lymphocytes, and increase in C-reactive protein and Interleukin 6 were observed.

CONCLUSIONS

This systematic review found little available information of patients under 80 years old, and far less for those over 80 years old, and an absence of comprehensive geriatric assessment.

Phylogenetic and full-length genome mutation analysis of SARS-CoV-2 in Indonesia prior to COVID-19 vaccination program in 2021

BACKGROUND

Indonesia has started the big project of COVID-19 vaccination program since 13 January 2021 by employing the first shot of vaccine to the President of Indonesia as the outbreak and rapid transmission of COVID-19 have endangered not only Indonesian but the global health and economy. This study aimed to investigate the full-length genome mutation analysis of 166 Indonesian SARS-CoV-2 isolates as of 12 January 2021.

RESULTS

All data of the isolates were extracted from the Global Initiative on Sharing All Influenza Data (GISAID) EpiCoV database. CoVsurver platform was employed to investigate the full-length genome mutation analysis of all isolates. This study also focused on the phylogeny analysis in unlocking the mutation of S protein in Indonesian SARS-CoV-2 isolates. WIV04 isolate that was originated from Wuhan, China was used as the virus reference according to the CoVsurver default. The result showed that a full-length genome mutation analysis of 166 Indonesian SARS-CoV-2 isolates was successfully generated. Every single mutation in S protein was described and then visualized by utilizing BioRender platform. Furthermore, it also found that D614G mutation appeared in 103 Indonesian SARS-CoV-2 isolates.

CONCLUSIONS

To sum up, this study helped to observe the spread of COVID-19 transmission. However, it also proposed that the epidemiological surveillance and genomics studies might be improved on COVID-19 pandemic in Indonesia.

SUPPLEMENTARY INFORMATION

The online version contains supplementary material available at 10.1186/s42269-021-00657-0.

Conocimiento, actitudes y prácticas de los estudiantes de cuarto, quinto y sexto año de la carrera de medicina de la Universidad Francisco Marroquín con relación a la pandemia COVID 19

Introducción: Medidas sin precedentes han tenido que tomarse para controlar la propagación rápida de la pandemia COVID-19 en Guatemala. La adherencia que tienen las personas a estas medidas se ve afectada por el conocimiento, actitud y prácticas (CAP) utilizadas ante el COVID-19. Objetivo: el propósito del estudio fue el de investigar CAP que tienen los estudiantes de medicina de cuarto, quinto y sexto año de la Universidad Francisco Marroquín durante la pandemia. Metodología: Un cuestionario en línea fue completado por los participantes. El cuestionario fue dividido en dos secciones. En la primera sección se solicitaban datos demográficos del participante. La segunda sección evaluó el conocimiento en 20 preguntas acerca de las características clínicas y prevención del COVID-19. Se evaluó la actitud y práctica de los participantes ante la enfermedad con preguntas simples en cuanto a la confianza que tienen los estudiantes en disminuir el contagio de la enfermedad y las medidas de protección que practican cada día como el uso de mascarilla, lavado de manos, distanciamiento social, entre otras. Resultados: Entre los participantes que completaron el cuestionario (n=108) 64.8% fueron mujeres. De todos los participantes el 47.2% pertenece a sexto año, 28.7% a quinto año y 24.1% a cuarto año. El promedio de conocimiento fue de 16.35 sobre 20 puntos en el cuestionario. El 100% de los participantes utiliza mascarilla al salir de casa. Y el 100% está de acuerdo con que la educación puede ayudar a prevenir la cantidad de casos de COVID-19. Conclusión: A medida que la amenaza global de COVID-19 continúa emergiendo, es fundamental mejorar el conocimiento y las percepciones entre los estudiantes de medicina. Se necesitan con urgencia intervenciones educativas para llegar a los trabajadores de la salud.

A district-level susceptibility and vulnerability assessment of the COVID-19 pandemic's footprint in India

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Examines the spread of the COVID-19 pandemic in India in four separate time steps.

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Uses geospatial and geostatistical measure to identify viral hotspots and clusters.

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Analyses COVID-19′s correlates at the district level, eliciting detailed outputs.

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Gauges epidemiological susceptibility and socioeconomic vulnerability to COVID-19.

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Provides a framework for denoting districts where lockdown measures can be eased.

In this study, we trace the COVID-19 pandemic's footprint across India's districts. We identify its primary epicentres and the outbreak's imprint in India's hinterlands in four separate time-steps, signifying the different lockdown stages. We also identify hotspots and predict areas where the pandemic may spread next. Significant clusters in the country's western and northern parts pose risk, along with the threat of rising numbers in the east. We also perform epidemiological and socioeconomic susceptibility and vulnerability analyses, identifying resident populations that may be physiologically weaker, leading to a high incidence of cases and pinpoint regions that may report high fatalities due to ambient poor demographic and health-related factors. Districts with a high share of urban population and high population density face elevated COVID-19 risks. Aspirational districts have a higher magnitude of transmission and fatality. Discerning such locations can allow targeted resource allocation to combat the pandemic's next phase in India.

[Medicine, epidemiology and humanism before and after COVID-19]

The rapid spread of SARS-CoV-2 requires evidence to help mitigate its global harm. Generating accurate measurements of the appropriate clinical and epidemiological indicators associated with COVID-19 is a necessary step in reducing the current pandemic's burden on individuals and the population at large. These unprecedented times have presented a challenge to chronic disease epidemiologists and have required a practical approach "to do something to help during this disaster." Options include returning to clinical care or resorting to online textbooks and resources for crash courses on outbreak research. However, being aware of the magnitude of individual suffering endured by so many, including many esteemed, close colleagues, becomes a personal challenge of enormous proportions. It is envisaged that the arts and other humanities can help re-establish balance, both during the pandemic and especially after it.

[Impact of the COVID-19 pandemic on emergency department: Early findings from a hospital in Madrid]

INTRODUCTION

SARS-CoV-2, coronavirus that causes coronavirus disease 2019 (COVID-19), was first detected in Spain on 31 January 2020. On 14 March 2020, a state of emergency was declared in Spain in a bid to control the spread of the COVID-19 pandemic in the country. The aim of our study is to analyse the impact on emergency medicine attendance after the national lockdown, as well as the clinical presentation and the management of patients with suspected COVID-19 in the Paediatric Emergency Department.

PATIENTS AND METHODS

This retrospective observational study included children and adolescents under the age of 18, attended in our Paediatric Emergency Department during the period March 14 to April 17, 2020.

RESULTS

A total of 1,666 patients were attended during the study period, 65.4% less than in the same period of 2019. Just over half (51.2%) were males, and mean age was 5.4 years. In triage, 39.9% were high priority levels, 6.5% more than 2019. Most frequent reasons for consultation at the Paediatric Emergency Department were fever (26.5%), respiratory symptoms (16.1%), and trauma (15.2%). A total of 218 patients (13%) received a diagnosis of possible COVID-19, with SARS-CoV-2 infection confirmed in 18.4%, and 23.8% (52/218) were hospitalised. At discharge, 44% (96/218) were diagnosed with lower, and 33.9% (74/218) with upper respiratory infection.

CONCLUSIONS

During the SARS-CoV-2 outbreak, the demand for urgent paediatric care decreased, with the proportion of cases with high priority triage levels increasing. Most of the patients with suspected or microbiological confirmation of COVID-19 had mild respiratory symptoms.

Detection of Bacterial and Viral Pathogens Using Photonic Point-of-Care Devices

Infectious diseases caused by bacteria and viruses are highly contagious and can easily be transmitted via air, water, body fluids, etc. Throughout human civilization, there have been several pandemic outbreaks, such as the Plague, Spanish Flu, Swine-Flu, and, recently, COVID-19, amongst many others. Early diagnosis not only increases the chance of quick recovery but also helps prevent the spread of infections. Conventional diagnostic techniques can provide reliable results but have several drawbacks, including costly devices, lengthy wait time, and requirement of trained professionals to operate the devices, making them inaccessible in low-resource settings. Thus, a significant effort has been directed towards point-of-care (POC) devices that enable rapid diagnosis of bacterial and viral infections. A majority of the POC devices are based on plasmonics and/or microfluidics-based platforms integrated with mobile readers and imaging systems. These techniques have been shown to provide rapid, sensitive detection of pathogens. The advantages of POC devices include low-cost, rapid results, and portability, which enables on-site testing anywhere across the globe. Here we aim to review the recent advances in novel POC technologies in detecting bacteria and viruses that led to a breakthrough in the modern healthcare industry.

Double Burden of COVID-19 Pandemic and Military Occupation: Mental Health Among a Palestinian University Community in the West Bank

Background

The Covid-19 pandemic created major global health crises, with serious effects on all aspects of life. The pandemic reached the Israeli occupied West Bank of Palestine in early March 2020, and lockdown immediately ensued.

Objectives

To assess the prevalence and predictors of distress and insecurity among Birzeit University's community during the COVID-19 pandemic and lockdown.

Methods

An online survey completed in March-April 2020 using standardized and previously validated distress and insecurity scales. The survey was placed on the University portal accessed by students, faculty and employees, and was sent by email to faculty and employees. Data were weighted to reflect the University community's distribution.

Findings

There were 1,851 participants in the study: 84% were undergraduate students, 10% graduate students, and 6% faculty and employees. Sixty two percent were women. Ages ranged from 17 to 70 years (mean 24 ± 9.7). Prevalence of moderate/high distress and insecurity were 40% and 48% respectively. Multiple logistic regression revealed that women, those under 35 years old and those with worse reported income, had significantly higher odds of distress and insecurity compared to their counterparts. Undergraduate students or living with a person at home with high risk of illness with COVID-19 were associated with higher odds of distress compared to their counterparts (OR = 1.56, 95%CI[1.13-2.15]) and (OR = 1.34, 95%CI[1.11-1.62]) respectively. A COVID-19 worry score was significantly associated with higher odds of distress and insecurity (OR = 1.77, 95%CI[1.46-2.14]) and (OR = 4.3, 95%CI[3.53-5.23]) respectively.

Conclusion

This study emphasizes the need to pay attention not only to physical health but also to mental health during the COVID-19 pandemic, especially among young people, women, those with lower economic status, and those living with high risk persons during the pandemic. We hope that this study will inform the policies and interventions of the Palestinian Authority, local non-governmental organization, international groups working in the occupied Palestinian territory, and beyond.

Psychological Impact of COVID-19 Confinement and Its Relationship with Meditation

The objective of this study was to evaluate the psychological impact of confinement due to the COVID-19 pandemic, considering any protective factors, such as the practice of meditation or self-compassion, and their relationship with different lifestyles and circumstances of adults residing in Spain. A cross-sectional study was done using an anonymous online survey in which 412 participants filled out the Depression, Anxiety and Stress Scale-2; the Impact of Events Scale; and the Self-Compassion Scale-Short Form, reporting severe symptomatology of posttraumatic stress and mild anxiety and depression. Quality of cohabitation and age were found to be key variables in the psychological impact of confinement. The impact of confinement was more negative for those who reported very poor cohabitation as opposed to very good (F (3, 405) = 30.75, p ≤ 0.001, d = 2.44, r = 0.054) or for those under 35 years of age compared to those over 46 (F (2, 409) = 5.14, p = 0.006, d = 0.36). Practicing meditation was not revealed as a protective factor, but self-compassion was related to better cohabitation during confinement (F (3, 403) = 11.83, p ≤ 0.001, d = 1.05). These results could be relevant in designing psychological interventions to improve coping and mental health in other situations similar to confinement.

SARS-CoV-2 IgG seroprevalence in blood donors located in three different federal states, Germany, March to June 2020

Most cases of coronavirus disease 2019 are mild or asymptomatic. Therefore, many cases remain unrecorded. We determined seroprevalence of IgG antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in 3,186 regular blood donors in three German federal states between 9 March and 3 June 2020. The IgG seroprevalence was 0.91% (95% confidence interval (CI): 0.58-1.24) overall, ranging from 0.66% (95% CI: 0.13-1.19) in Hesse to 1.22% (95% CI: 0.33-2.10) in Lower-Saxony.

Epidemiology of COVID-19 in Mexico: from the 27th of February to the 30th of April 2020

BACKGROUND

The first case of COVID-19 detected in Mexico was on the 27^th of February 2020. On the 30^th of April, 64 days after this first diagnosis, the number of patients had increased exponentially, reaching 19 224 confirmed cases and 1859 (9.67%) deaths. In response to this global outbreak, we summarize the current state of our understanding regarding COVID-19 in Mexico.

METHODS

We obtained the data from the official website of the Ministry of Health in Mexico. The study period was between the 27^th of February and the 30^th of April 2020. The cases were confirmed using real-time reverse transcription-polymerase chain reaction, and we analysed epidemiological, demographic and clinical data.

RESULTS

In Mexico, most cases of COVID-19 were located in Mexico City. The mean age of the patients was 46 years. Of the 12 656 confirmed cases, most infected individuals were between the ages of 30 and 59 years (65.85%), and there was a higher incidence rate in men (58.18%) than in women (41.82%). The patients who died had one or more comorbidities, mainly hypertension (45.53%), diabetes (39.39%) and obesity (30.4%). In the first 64 days of the epidemic, China had reported 80 304 cases with a mortality rate of 3.66%.

CONCLUSIONS

Our results indicate an early transmission of COVID-19 in Mexico. The descriptive epidemiology shows similarities between the cases of COVID-19 in Mexico and those in China. In the same period of the epidemic curve, we observed a reduction in the number of confirmed cases of COVID-19 in Mexico and a higher mortality rate compared with that of China.

Contributions of Latin American researchers in the understanding of the novel coronavirus outbreak: a literature review

This article aimed to give the visibility of Latin American researchers' contributions to the comprehension of COVID-19; our method was a literature review. Currently, the world is facing a health and socioeconomic crisis caused by the novel coronavirus, SARS-CoV-2, and its disease COVID-19. Therefore, in less than 4 months, researchers have published a significant number of articles related to this novel virus. For instance, a search focused on the Scopus database on 10 April 2020, showed 1,224 documents published by authors with 1,797 affiliations from 80 countries. A total of 25.4%, 24.0% and 12.6% of these national affiliations were from China, Europe and the USA, respectively, making these regions leaders in COVID-19 research. In the case of Latin America, on 10 April 2020, we searched different databases, such as Scopus, PubMed and Web of Science, finding that the contribution of this region was 2.7 ± 0.6% of the total publications found. In other words, we found 153 publications related to COVID-19 with at least one Latin American researcher. We summarized and processed the information from these 153 publications, finding active participation in topics like medical, social and environmental considerations, bioinformatics and epidemiology.

[Epidemiology of COVID-19 in Mexico: from the 27th of February to the 30th of April 2020]

Antecedentes

El primer caso de COVID-19 se detectó en México el 27 de febrero de 2020. El 30 de abril, 64 días después de este primer diagnóstico, el número de pacientes aumentó exponencialmente, alcanzando un total de 19.224 casos confirmados y 1.859 (9,67%) fallecidos. En respuesta a este brote global, resumimos el estado actual del conocimiento sobre COVID-19 en México.

Métodos

Los datos se obtuvieron del sitio web oficial del Ministerio de Salud en México. El período analizado fue entre el 27 de febrero y el 30 de abril de 2020. Los casos se confirmaron mediante RT-PCR en tiempo real y se analizaron los datos epidemiológicos, demográficos y clínicos.

Resultados

La mayoría de los casos de COVID-19 se ubicaron en la Ciudad de México. La edad promedio de los pacientes fue de 46 años. De los 12.656 casos confirmados, el mayor número de infectados ocurre en el rango de edad entre 30 y 59 años (65,85%), y hubo una mayor incidencia en hombres (58,18%) que en mujeres (41,82%). Los pacientes fallecidos tenían una o múltiples comorbilidades, principalmente hipertensión (45,53%), diabetes (39,39%) y obesidad (30,4%). En los primeros 64 días de epidemia, China había reportado 80.304 casos con una tasa de mortalidad del 3,66%.

Conclusiones

Nuestros resultados indican la transmisión temprana de COVID-19 en México. La epidemiología descriptiva muestra las similitudes entre los casos de COVID-19 de México y China. En el mismo período de la curva epidémica, observamos en México una reducción en el número de casos confirmados de COVID-19 y una mayor tasa de mortalidad en comparación con China.

Estandarización de Emergencia para el Diagnóstico del virus SARS-CoV-2 mediante la Reacción en Cadena de la Polimerasa de Transcripción Reversa en Tiempo Real (RT-PCR) en situación de pandemia de COVID-19

Ante la pandemia del coronavirus emergente SARS-CoV-2 (Coronavirus 2 relacionado con el Síndrome Respiratorio agudo severo), es necesaria la estandarización precisa del diagnóstico hospitalario para reducir el tiempo de respuesta en la confirmación de un caso de sospecha. Por esta razón el diagnóstico de laboratorio es una prioridad de los sistemas de salud pública. En la provincia de Soria, de cerca de 100.000 habitantes, con una población muy envejecida, un índice de mortalidad por COVID-19 del doble que el observado en España, el único Hospital Santa Bárbara de la red pública es el único centro diagnóstico de SARS-CoV-2. En el Servicio de Microbiología, hemos establecido una robusta metodología diagnóstica para la detección del ARN viral presente en muestras de pacientes infectados mediante la técnica de Reacción en Cadena de la Polimerasa de Transcripción Reversa (RT-PCR) en Tiempo Real, que permiten en aproximadamente 4 horas emitir un informe. Este estudio describe el proceso que podría guiar a Servicios de Microbiología de otros Centros Hospitalarios.