US health officials are concerned about a potential outbreak of avian flu, which has already affected poultry populations in several countries.
Avian flu, also known as bird flu, is a virus that can infect birds and, in some cases, humans. The virus is transmitted through contact with infected birds, their feces, or contaminated surfaces.
While human-to-human transmission is rare, it can happen, and the virus has the potential to mutate into a more dangerous form.
The US Department of Agriculture (USDA) has raised the alert level for avian flu and is taking measures to prevent its spread. These include increased surveillance of poultry farms, restrictions on bird imports from affected countries, and the development of a vaccine for the virus.