(Undated) The New World screwworm (NWS), a parasitic fly larva, is back after being eradicated from the U.S. in 1966. The first case was confirmed in a Texas calf last week, but it is possible for the insect to also infect pets, wildlife, birds, and even people. There has not been an outbreak since a small one in the Florida Keys in 2017.
NWS lay eggs in wounds of these animals, and then the larvae feed on live or dead flesh. If left untreated, it can become deadly for the host. The CDC advises medical experts to completely remove eggs and larvae from a patient’s body.
Those who spend a lot of time outdoors and around animals are most likely to be exposed to NWS, but regularly checking pets, livestock, and vehicles for flies or larvae is advised. Report or seek medical care if you or another animal have visible larvae or eggs, a sensation of movement, foul odor, bloody discharge, and/or pain on or around a wound.
While there are no specific vaccines or treatments for NWS, the FDA has approved emergency use authorizations for certain topical sprays, injections, and tablets for multiple species on June 11. Visit the Animal Drugs for New World Screwworm website for more updates and information.
