Cadernos de Saúde Pública versão impressa ISSN 0102-311X CODECO,
Cláudia Torres et al. The epidemic wave of influenza A (H1N1) in
Brazil, 2009. Cad. Saúde Pública [online]. 2012, vol.28, n.7,
pp. 1325-1336. ISSN 0102-311X.
http://dx.doi.org/10.1590/S0102-311X2012000700011. This study
describes the main features of pandemic influenza A (H1N1) in
Brazil during 2009. Brazil is a large country that extends
roughly from latitudes 5ºN to 34ºS. Brazil has tropical and sub-
tropical climates, a heterogeneous population distribution, and
intense urbanization in the southern portions of the country and
along its Atlantic coast. Our analysis points to a wide
variation in infection rates throughout the country, and
includes both latitudinal effects and strong variations in
detection rates. Two states (out of a total of 23) were
responsible for 73% of all cases reported. Real time
reproduction numbers demonstrate that influenza transmission was
sustained in the country, beginning inMay of 2009. Finally, this
study discusse