RIO DE JANEIRO, BRAZIL - In addition to the considerable number of cases, the flu epidemic in Rio de Janeiro has a worrisome component. Among the variants of the influenza virus circulating in the city, there is a recent mutation of the H3N2 that had not yet been identified in Brazil.
The variant is provisionally named H3N2 Darwin, because it was first reported in the city of Darwin, Australia. "It is a mutation of the virus circulating in the Northern Hemisphere that has reached Brazil," says virologist Fernando Motta of the Laboratory of Respiratory Viruses and Measles of the Oswaldo Cruz . . .
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