The CDC plans to probe samples collected from a fatal influenza infection in Brazil, after investigators discovered the death was caused by an H1N1 variant spreading in 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.
"Based on the information currently available, WHO considers this a sporadic case, and there is no evidence of person-to-person transmission of this event. The likelihood of community-level spread among humans and/or international disease spread through humans is low," the WHO saidInitial analyses of the sample by health authorities in Brazil have confirmed the virus behind this death to be H1N1. It is closely related to previous samples of H1N1 spotted in the region.
"To date, sporadic human infections caused by influenza Av and Av viruses have been reported in Brazil, and there has been no evidence of sustained human-to-human transmission," the WHO said.thousands of sequenced flu viruses collected each year, comparing its genes with previous variants that have infected animals and humans.
This summer, the Biden administration has been planning to ramp up efforts to spot cases of these potentially deadly new
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