Bird Flu Heat Tolerance: Scientists Uncover Pandemic Threat

Imagine a virus that treats your body's best defense—a fever—like a warm bath. New research reveals how bird flu's incredible heat tolerance makes it a major pandemic threat. While a fever can stop human flu, which prefers cooler 33°C airways, avian flu strains are built to withstand the 40-42°C heat of a bird's gut. Scientists have pinpointed the PB1 gene as the culprit, a genetic key that allows this heat resistance and was swapped into human flu strains during the deadly 1957 and 1968 pandemics. This discovery explains why some pandemics are so severe and gives us a new way to predict future threats. This allows for targeted surveillance of bird flu strains and could even reshape how we use fever-reducing drugs during an outbreak.