Cluster of SARS-CoV-2 Gamma Variant Infections, Parintins, Brazil, March 2021
Juliana F. da Silva

, Roberto J. Esteves, Charlene Siza, Elaine P. Soares, Tatyana C. Ramos, Evelyn C. Campelo, Cristiano F. da Costa, Leila C. de Alencar, Rafaela P. Cavalcante, Clerton R. Florêncio, Tirza P. Mattos, Maria G. Bonecini-Almeida, Luciana Silva-Flannery, Barbara J. Marston, Juliette Morgan, Mateusz Plucinski, Felipe Naveca, and
CDC Brazil Investigation Team1
Author affiliations: US Centers for Disease Control, Atlanta, Georgia, USA (J.F. da Silva, C. Siza, L. Silva-Flannery, B.J. Marston, M. Plucinski); US Centers for Disease Control and Prevention, Brasilia, Brazil (R.J. Esteves, J. Morgan); Secretaria Municipal de Saúde de Parintins, Parintins, Brazil (E.P. Soares, R.P. Cavalcante, C.R. Florêncio); Fundação de Vigilância em Saúde do Amazonas, Manaus, Brazil (T.C. Ramos, E.C. Campelo, C.F. da Costa, L.C. de Alencar); Laboratório Central de Saúde Pública do Amazonas, Manaus (T.P. Mattos); Fundação Oswaldo Cruz, Rio de Janeiro, Brazil (M.G. Bonecini-Almeida); Instituto Leônidas and Maria Deane, Manaus (F. Naveca); Team members are listed at the end of the article.1
Main Article
Table
History of previous infection among 81 persons infected with SARS-CoV-2 Gamma variant, infected with SARS-CoV-2 non–Gamma variant, or not infected with SARS-CoV-2, Parintins, Brazil, March 2021*
Infection status |
No. (%)
|
p value (Gamma . negative)‡ |
Gamma variant, n = 31 |
Non–Gamma variant, n = 14 |
Negative, n = 36† |
Previous infection according to clinical history |
|
|
|
|
Yes |
4 (13) |
4 (29) |
18 (50) |
0.0016
|
No
|
27 (87)
|
10 (71)
|
18 (50)
|
IgG result at time of investigation |
|
|
|
|
Positive |
5 (16) |
10 (71) |
25 (69) |
<0.0001
|
Negative
|
26 (84)
|
4 (29)
|
11 (31)
|
Previous infection according to clinical history and positive IgG at time of investigation |
|
|
Yes |
0 |
3 (21) |
16 (44) |
<0.0001 |
No |
31 (100) |
11 (79) |
20 (56) |
Main Article
Page created: November 10, 2021
Page updated: December 20, 2021
Page reviewed: December 20, 2021
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