0028-3746 0028-3746 S0028-37462021000100004 10.35366/99446 Mexico 00 03 2021 00 03 2021 80 1 4 5 1 European Center for Disease Control 2021 29 2 2021 70 2 2 58-62 3 2021 4 2020 586 7830 7830 481-2