Secondary attack rate of COVID-19 among contacts and risk factors, Tamil Nadu, March-May 2020: a retrospective cohort study.

Objective: To describe the characteristics of contacts of patients with COVID-19 case in terms of time, place and person, to calculate the secondary attack rate (SAR) and factors associated with COVID-19 infection among contacts.

Design: A retrospective cohort study SETTING AND PARTICIPANTS: Contacts of cases identified by the health department from 14 March 2020to 30 May 2020, in 9 of 38 administrative districts of Tamil Nadu. Significant proportion of cases attended a religious congregation.

Prevalence of open defecation among households with toilets and associated factors in rural south India: an analytical cross-sectional study.

Background: India's National Sanitation Mission aims to end open defecation by changing social norms and behaviours coupled with financial subsidies to build toilets. An earlier evaluation in the rural Dharmapuri district of Tamil Nadu reported poor use of household toilets constructed with government assistance. Our objectives were to estimate the prevalence of adults with a household toilet practicing open defecation and determine the factors associated with it.