Lucio Fulci’s “Zombi 3”.
After a botched theft of a bio weapon, one of the thieves is exposed and becomes a zombie. He infects others, but when the army burns his corpse, the virus survives, infecting birds who infect other humans. The army’s method is simple. Quarantine the area and kill every person they find inside, zombie and human alike, to check the spread and to eliminate the witnesses!
