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Objective. To describe the design of the Mexican 2021 National Health and Nutrition Survey (Ensanut 2021). Materials and methods. The Ensanut 2021 is a probabilistic household survey that is part of the continuous Ensanut 2020-2024; survey outreach, sampling, measurement and logistic organization are described. Results. It is planned to obtain at least 12 060 complete household interviews and 9 837 samples to determine SARS-CoV-2 seropositivity at the national level. Conclusions. Ensanut 2021 will allow to estimate the seroprevalence of SARS-CoV-2 antibodies at regional and national level; also, it will accumulate information to make state inferences for the year 2024. [ABSTRACT FROM AUTHOR]

Objective. To assess the association of family and housing characteristics with the number of seropositive cases to SARS-CoV-2 in households. Materials and methods. We analyzed 874 households from Encuesta Nacional de Salud y Nutrición (Ensanut) 2020 Covid-19 using Poisson regression models. Results. The number of seropositive family members was higher among families composed of children/adolescents, adults and older adults, households with more than two members per bedroom, and among households with closed windows. No association was found for bathroom availability and piped water. Conclusions. Family composition and housing characteristics can impose significant structural barriers to safe home confinement. [ABSTRACT FROM AUTHOR]

Objective. To analyze the association between the presence of anti SARS-CoV-2 antibodies and other household characteristics and the food insecurity in a national sample of Mexican households. Materials and methods. Information at household level about food security (FS), sociodemographic factors, changes in family economy and food consumption was obtained in a national and representative sample. The relation between food insecurity (FI) and household characteristics was established through ordinal logistic regression, multinomial regression models were used to study the self-reported changes in food consumption and FI in the presence of antibodies against SARS-CoV-2 in at least one inhabitant of the household. Results. Households with seropositive cases shown a lower meat consumption. In those households which suffered an income reduction and had at least one individual positive for anti SARS-CoV-2 antibodies, the FI-in its higher levels-worsened (OR=1.225; CI95%: 1.04, 1.44). Conclusions. The food insecurity in households during pandemic worsened due to many factors, in this sense integral actions of public policies are required. [ABSTRACT FROM AUTHOR]

Objective. To estimate the seroprevalence of SARSCoV-2 in school aged children in Mexico. Materials and methods. We categorized children and adolescents who participated in 2020 National Health and Nutrition Survey on Covid-19 according to school age and educational level. In seropositive participants, we identified the proportion of asymptomatic infections. We estimated prevalence ratios using a log-binomial regression model. Results. Seroprevalence of SARS-CoV-2 for primary and secondary education were 18.7% (95%IC: 14.9, 22.5) and 26.7% (95%IC: 22.1, 31.3), respectively. Asymptomatic infection was more frequent among primary school children (88.5% [95%IC: 80.5, 93.5]). Conclusions. In primary schoolchildren seroprevalence for SARSCoV-2 was low and infections were usually asymptomatic. [ABSTRACT FROM AUTHOR]

Objective. To estimate the prevalence of Covid-19 sequelae and its association with sociodemographic and medical care characteristics. Materials and methods. Mexican adults that experienced Covid-19 symptoms and were seropositive to the N-protein of Sars-CoV-2 in the Ensanut 2020 responded to a question regarding sequelae. Associations were estimated using Poisson regression. Results. The prevalence of sequelae was 15.7%, being higher for people with higher education and who were hospitalized or treated at an emergency room during the acute Covid-19 phase. Conclusions. Self-reported sequelae associated to Covid-19 was frequent. Covid-19 sequelae could represent an important challenge for the health system and the Mexican society. [ABSTRACT FROM AUTHOR]

Objective. To analyze the association between seropositivity to SARS-CoV-2 and chronic diseases in Mexican adults and older adults. Materials and methods. We used the 2020 National Health and Nutrition Survey on Covid-19 to evaluate the association of seropositivity to SARS-CoV-2 with high blood pressure, type 2 diabetes, body mass index, elevated LDL-c, low HDL-c, high total cholesterol, and hypertriglyceridemia. Results. We observed a higher seropositivity at higher body mass index levels. In adjusted models, seroprevalence was 25% higher among adults with obesity compared to those of normal weight (PR: 1.25 95%CI: 1.08,1.46). We did not observe any association between seropositivity and other chronic diseases in adults or older adults. Conclusions. Adults with obesity could be at increased susceptibility of SARS-CoV2 infection. This observation needs to be confirmed through longitudinal studies. We did not find evidence of an association with other chronic diseases. [ABSTRACT FROM AUTHOR]

Objective. To analyze the relationship between chronic exposures to air pollution with Covid-19 death rate in Mexican cities. Materials and methods. Ecological study in 25 Mexican cities using the report of daily Covid-19 deaths (from February to June 2020) and validated data of air pollutants, considering average concentrations in each city for the last year. Poisson regression models using generalized additive models with adjustment variables (GAM) were used. Results. A significant increase of 3.5% (95% CI 2.3-4.7) was found in Covid-19 death rate for each 1µg/m3 in annual concentration of NO2. The association with PM2.5 was not significant, with an increase of 1.8% for each 1µg/m3. Conclusions. Results suggest an association between Covid-19 mortality and chronic exposure to NO2. This first approximation of the risk associated with air pollution requires a more precise analysis, but is consistent with what was observed in other studies. [ABSTRACT FROM AUTHOR]