The US previously eradicated NWS through releasing sterile male flies to mate with female NWS blowflies.
Mexico has reported 92 cases of myiasis caused by New World screwworm as of November.
Mexico has seen 55 human cases of New World screwworm this year.
FDA officials say they have determined Dectomax-CA1 is safe and has a reasonable expectation of effectiveness against the flesh-eating parasitic infection.
The 8-month-old cow had recently been moved to a certified feedlot in Nuevo Leon from a southern Mexico area with active infections.
HHS says the last time NWS was detected in animals or livestock in the United States was in the Florida Keys in 2017.
So far, US federal officials have not confirmed any cases in animals this year.
NYC has now reported 4 deaths among 101 Legionnaire's cases, and 15 people are currently hospitalized.
The program, which has battled tickborne disease since 1906, will now round-up stray livestock for preventive screwworm treatment.
The CDC's latest chikungunya travel advisory is for a hot spot in China's Guangdong province.
