Gladys Porter Zoo veterinary staff euthanized Neb, a 17-year-old white tiger, as medical remedies couldn't resolve the tiger's severe mobility issues, the zoo wrote in a Monday Facebook post.

Four antiviral drugs are available for the prevention and treatment of influenza infections: oseltamivir, zanamivir, rimantadine and amantadine. Oseltamivir and zanamivir are neuraminidase ...