SÃO PAULO—Health officials in Brazil reported two cases of the Zika virus being transmitted through blood transfusions, the latest challenge in the global battle against the fast-spreading mosquito-borne epidemic.
Both cases were reported by health officials in Campinas, a wealthy industrial city of about one million people an hour northwest of São Paulo, the country’s largest city.
A number of countries are tightening their rules on blood donations in response to the global Zika outbreak.
The American Red Cross said on Wednesday it is asking potential blood donors who have been in Mexico, the Caribbean or Central or South America to wait at least 28 days after their trip before donating.
Cármino Antonio de Souza, health secretary of Campinas, said on Wednesday that both transfusions occurred during the first four months of 2015, but the presence of Zika in the two transfusion recipients wasn’t confirmed until recently, in part because they were initially suspected of being infected with dengue, another mosquito-borne virus.
As many as 1.5 million Brazilians may have been infected with the mosquito-borne Zika virus and now the U.S. and other countries are also reporting new cases. But what is the Zika virus? And why does it pose a threat to pregnant women? Dipti Kapadia explains. Photo: Getty Images
The first case involved a liver-transplant recipient who contracted Zika through blood donated in March 2015. The second was a gunshot victim who tested positive for Zika after receiving multiple blood transfusions; he later died of his wounds, not the Zika virus, Campinas health officials said.