Slow Spread of SARS-CoV-2 in Southern Brazil Over a 6-Month Period: Report on 8 Sequential Statewide Serological Surveys Including 35 611 Participants. - Hallal PC; Silveira MF; Menezes AMB; Horta BL; Barros AJD; Pellanda LC; Victora GD; Dellagostin OA; Struchiner CJ; Burattini MN; Mesenburg MA; Jacques N; et al. (American journal of public health, 2021)