10. Avian Influenza (Bird Flu)
Avian Influenza, or bird flu, is a viral infection primarily affecting birds but can also infect humans. In rare cases, it can lead to severe illness or death, especially if the virus mutates and spreads easily between humans. The H5N1 strain is one of the deadliest, with a fatality rate of over 50% in humans who become infected.
Despite limited human-to-human transmission, its potential to cause a pandemic remains a public health concern.