CDC to investigate swine flu virus behind woman's death in Brazil


The Centers for Disease Control and Prevention plans to probe samples collected from a fatal influenza infection in Brazil, the World Health

Organization announced, after investigators discovered the death was caused by an H1N1 variant spreading in pigs. 

Occasional so-called "spillovers" of H1N1 swine flu have been spotted throughout the world in people who interacted with infected pigs.

However, it is unclear how the patient in this case caught the virus. The patient, a 42-year- old woman living in the Brazilian state of Paraná, never had direct contact with pigs. 

Two of her close contacts worked at a nearby pig farm, investigators found, but both have tested negative for influenza and never had respiratory symptoms. 

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