Secondary attack rate of COVID-19 among contacts and risk factors, Tamil Nadu, March-May 2020: a retrospective cohort study.
Kolandaswamy KarumanagoundarMohankumar RajuManickam PonnaiahPrabhdeep KaurVidhya ViswanathanPolani RubeshkumarManikandanesan SakthivelPorchelvan ShanmugiahParasuraman GaneshkumarSanthosh Kumar MuthusamySendhilkumar MuthappanVettrichelvan VenkatasamyIrene SambathKumaravel IlangovanJagadeesan MurugesanRameshkumar GovindarajanSoundammal ShanmugamSelvakumar RajarathinamKst SureshM VaradharajanManivannan ThiagarajanK JagadeeshkumarVelmurugan GaneshSateesh KumarPrakash VenkatesanYogananth NallathambiSampath PalaniT S SelvavinayagamMadhusudhan ReddyBeela RajeshManoj V MurhekarPublished in: BMJ open (2021)
Our study showed an increase in disease transmission among household contacts than community contacts. Also, symptomatic primary cases and primary cases with exposure to the congregation had more secondary cases than others.