COVID-19: What we talk about when we talk about masks

Prevalence of virological and serological markers of SARS-CoV-2 infection in the population of Ribeirão Preto, Southeast Brazil: an epidemiological survey

INTRODUCTION:

This epidemiological household survey aimed to estimate the prevalence of the current and past SARS-CoV-2 infections in Ribeirão Preto, a municipality of southeast Brazil.

METHODS:

The survey was conducted in two phases using a clustered sampling scheme. The first phase spanned May 1-3 and involved 709 participants. The second phase spanned June 11-14, 2020, and involved 646 participants.

RESULTS:

During the first phase, RT-PCR performed on nasopharyngeal swabs was positive at 0.14%. The serological tests were positive in 1.27% of the patients during the first phase and 2.79% during the second phase. People living in households with more than five members had a prevalence of 10.83% (95%CI: 1.58-74.27) higher than those living alone or with someone other. Considering the proportion of the positive serological test results with sex and age adjustments, approximately 2.37% (95%CI: 1.32-3.42) of the population had been cumulatively infected by mid-June 2020, which is equivalent to 16,670 people (95%CI: 9,267-24,074). Considering that 68 deaths from the disease in the residents of the city had been confirmed as at the date of the second phase of the survey, the infection fatality rate was estimated to be 0.41% (95%CI: 0.28-0.73). Our results suggest that approximately 88% of the cases of SARS-CoV-2 infection at the time of the survey were not reported to the local epidemiological surveillance service.

CONCLUSIONS:

The findings of this study provide in-depth knowledge of the COVID-19 pandemic in Brazil and are helpful for the preventive and decision-making policies of public managers.

Impacto de la introducción del cubrebocas contra el COVID-19: una revisión narrativa

El objetivo de este trabajo fue identificar el impacto de la introducción del cubrebocas contra el COVID-19: qué características tiene y cómo se ha introducido alrededor del mundo. Para ello, se realizó una revisión de la literatura disponible en una base de datos especializada, PUBMED, la cual se ajustó a las directrices enmarcadas en la metodología PRISMA . Se definieron ecuaciones de búsqueda bajo los términos MeSH: humans, COVID-19, severe acute respiratory síndrome coronavirus 2, masks y equipment design, utilizando el carácter booleano AND. Con estas ecuaciones se buscaron artículos publicados en 2020, recuperando 676 registros en total, eligiendo 82 que abordan el tema de interés e incluyendo en la revisión final 49 artículos que cumplían con todos los criterios de inclusión y exclusión definidos. Los resultados sugieren que la introducción de mascarillas tuvo un impacto positivo para reducir el riesgo de COVID-19 y el uso inadecuado del cubrebocas es un factor de riesgo.