A resurgence of swine flu has killed more than 1,000 people in Brazil since the start of this year, announced the health minister.
With the Rio Olympics just two months away, health officials reported 1,003 deaths so far this year from swine flu -- also known as H1N1 virus.
That number is the most fatalities linked to the disease in Brazil since 2009, when 2,060 people died.
‘The number of swine flu cases increased in May and June as the temperature declined. The virus has affected nearly all of Brazil's 27 states, particularly the southeast region.’
Government health officials said they have recorded 5,214 total swine flu cases between January 3 and June 11 of this year.
More people tend to fall victim to the disease in May and June, when the weather starts to get cooler. The uptick began earlier than usual this year, catching health authorities off-guard.
"Vulnerable, unvaccinated populations have been left unprotected," Caio Rosenthal of the Emilio Ribas infectology Institute told the Brazilian news website G1.
"As soon as we began to distribute the vaccine, cases have decreased," Rosenthal noted.
The virus has affected nearly all of Brazil's 27 states, but is particularly concentrated in the southeast region, where 2,606 infections and 540 deaths have been reported.
The majority of those cases have come from the Sao Paulo region, Brazil's political and economic epicenter, where 2,197 cases have been recorded, 434 of them fatal.
Rio de Janeiro, where the Olympics will be held from August 5-21, has recorded 150 cases and 44 deaths linked to the virus.
The rise in swine flu cases is another blow to the South American country already dealing with a Zika virus epidemic, an illness transmitted by the Aedes aegypti mosquito with symptoms similar to dengue.
Zika is of particular concern because it can cause infected pregnant women to bear children with microcephaly, a birth defect that causes abnormally small heads and deformed brains.
As of June 18, Brazil has registered 1,616 microcephaly cases. Authorities do not anticipate the epidemic will affect the half a million tourists expected to attend the Olympics because temperatures are expected to cool.
The world's fourth-ranked golfer Rory McIlory of Northern Ireland announced Wednesday he would not compete in Rio for fear of contracting Zika virus.