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Epidemiological Update - Yellow Fever - 2 March 2017

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Situation summary in the Americas

Since epidemiological week (EW) 1 to EW 7 of 2017, Brazil, Colombia, Peru, and the Plurinational State of Bolivia, have reported suspected and confirmed yellow fever cases.

The following is a situation summary in Brazil.

In Brazil, since the beginning of the outbreak in December 2016 to EW 7 of 2017, there were 1,368 cases of yellow fever reported (326 confirmed, 125 discarded, and 916 suspected cases remain under investigation), including 220 deaths (109 confirmed, 6 discarded, and 105 under investigation). The case fatality rate (CFR) is 33% among confirmed cases and 11% among suspected cases.

According to the probable site of infection, 83% of the suspected and confirmed cases were reported in the state of Minas Gerais (1,209), followed by Espírito Santo (185), São Paulo (10),
Bahia (9), Tocantins (2), Goías (1) and Rio Grande do Norte (1). The confirmed cases are distributed in three states: Minas Gerais (269), Espírito Santo (53), and São Paulo (4). Figure 1 illustrates the municipalities with confirmed cases and cases under investigation, as well as confirmed epizootics, and epizootics under investigation.

In Minas Gerais, the downward trend in cases in the four administrative regions of the state continues to be observed. Nonetheless, the decreasing trend will continue to be monitored to see if it continues in all the regions in the coming weeks (Figure 2).

In Espírito Santo, there were 120 new cases (confirmed and under investigation) reported from 2 February to 24 February, bringing the total from 65 to 185 cases over a period of four weeks.
In Minas Geraís, during the same period there were 256 new cases reported, bringing the total from 773 to 1,029 cases.

There is possibility of a change in the yellow fever transmission cycle in this current outbreak, however, to date Aedes aegypti has not been reported to have a role in transmission.