By Lise Alves, Senior Contributing Reporter

SÃO PAULO, BRAZIL – After the confirmation of at least twelve deaths since 2017 from yellow fever in the São Paulo metropolitan area, health officials have announced a massive vaccination campaign against yellow fever in February. Authorities say that the vaccine given during the campaign, however, will be ‘fractionized’, or divided into four doses.

"There is no difference in efficacy between fractional and integral vaccines. What we are discussing is the time it endures by protecting at the level of sufficient antibodies for number of years,” noted David Uip São Paulo state . . .

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