Secondary attack rate of COVID-19 among contacts and risk factors, Tamil Nadu, March–May 2020: a retrospective cohort study by Prabhdeep Kaur, Parasuraman Ganeshkumar, Kolandaswamy Karumanagoundar, Mohankumar Raju, Manickam Ponnaiah, Vidhya viswanathan, Polani Rubeshkumar, Manikandanesan Sakthivel, Porchelvan Shanmugiah, Santhosh Kumar Muthusamy, Muthappan Sendhilkumar, Vettrichelvan Venkatasamy, Irene Sambath, Kumaravel Ilangovan, Jagadeesan Murugesan, Rameshkumar Govindarajan, Soundammal Shanmugam, Selvakumar Rajarathinam, KST Suresh, M Varadharajan, Manivannan Thiagarajan, K Jagadeeshkumar, Velmurugan Ganesh, Sateesh Kumar, Prakash Venkatesan, Yogananth Nallathambi, Sampath Palani, TS Selvavinayagam, Madhusudhan Reddy, Beela Rajesh, Manoj V Murhekar

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