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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 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 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]