# FDA emergency authorizations for screwworm prevention

> Live situation record from CLSTR: https://clstr.news/situations/fda-emergency-authorizations-for-screwworm-prevention
> Updated: 2026-08-31T20:00:00.000Z. Sources: 5. Developments: 2.

The U.S. Food and Drug Administration (FDA) has issued multiple Emergency Use Authorizations (EUAs) to combat New World screwworm infestations.

In mid-August, the FDA authorized CLiK Extra, a wound spray that acts as an insect growth regulator. This authorization covers livestock such as cattle, sheep, and swine, as well as various wildlife species including deer and bison. The goal is to disrupt larval development and prevent animals from contributing to the spread of the parasite.

By late August, the FDA expanded available treatments by authorizing Bimectin (ivermectin) injection for use in cattle. This generic option allows for administration during birth, castration, or wound appearance, though it is restricted for use in lactating dairy cows or calves intended for veal. Officials noted that providing generic options like Bimectin ensures producers are not dependent on a single manufacturer for parasite protection.

## Claims

- The FDA issued an Emergency Use Authorization for Bimectin injection to prevent New World screwworm infestations in cattle. (corroborated by 4 sources)
- Bimectin injection is not authorized for use in lactating dairy cows or calves intended for veal production. (corroborated by 4 sources)
- The authorization allows administration within 24 hours of birth, during castration, or when a wound appears. (corroborated by 4 sources)
- Bimectin is a generic version of the drug Ivomec. (corroborated by 4 sources)
- Cattle producers must follow a 35-day slaughter withdrawal period to prevent drug residues in the food supply. (corroborated by 3 sources)
- The application for Bimectin was submitted by the Ireland-based company Bimeda Animal Health. (single source)

## Timeline

### 2026-08-31: FDA authorizes generic Bimectin injection to prevent screwworm in cattle

The FDA has issued an Emergency Use Authorization for Bimectin (ivermectin) injection to prevent New World screwworm infestations in cattle, expanding generic drug options for producers.

5 sources. https://clstr.news/cluster/fda-authorizes-generic-bimectin-injection-to-prevent-screwworm-in-cattle

### 2026-08-16: FDA authorizes CLiK Extra wound spray to prevent screwworm

The FDA has issued an emergency use authorisation for CLiK Extra wound spray to prevent New World screwworm infestations in livestock and various captive wildlife species.

3 sources. https://clstr.news/cluster/fda-authorizes-clik-extra-wound-spray-to-prevent-screwworm

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Cite as: FDA emergency authorizations for screwworm prevention. CLSTR, https://clstr.news/situations/fda-emergency-authorizations-for-screwworm-prevention