Bird flu has reached polar bears in Alaska

This is the first time a polar bear infected with bird flu has been reported dead in northern Alaska.

Previous studies have shown that the influenza virus is highly adaptive and capable of exchanging genetic material with related viruses affecting the same cells. This increases the viability of the pathogen and its ability to reproduce.

But in order to adapt to a mammal, the virus needs certain gene changes that have not yet been discovered in the strain. This is possible, however, if mammals feed on infected birds.

Among animals and birds, scavengers are particularly affected by H5N1. Many sea birds have been killed by the virus, and their bodies are eaten by seals and polar bears, among others.