Alencar do Nascimento CM, Freire De Souza CD, de Oliveira Silva LE, Oliveira Silva W, Amaro Barbosa N, Feliciano do Carmo R, de Lima Andrade E, Henrique de Oliveira Teixeira S, José Matos Rocha T (2022) COVID-19 risk areas associated with social vulnerability in northeastern Brazil: an ecological study in 2020. J Infect Dev Ctries 16:1285–1293. doi: 10.3855/jidc.15214