US screwworm cases rise as outbreak spreads beyond initial contamination zones

Screwworm cases are rising in the US as the outbreak spreads beyond the initial contamination zones. Twelve animal cases have been confirmed so far, a significant increase from the first case detected in a calf in south Texas on 3 June. The growing number of infections has alarmed agricultural experts, who warn that a wider outbreak could have serious consequences for the Texas beef industry. Of the 12 reported cases, 11 remain active and one is inactive, according to an update issued last Thursday by the US Department of Agriculture’s animal and plant health inspection service. The most recent case was reported on 12 June in Sutton countyin west Texas, where a sheep was discovered with the infection. Other cases have been identified in the Texas counties of Edwards, Tom Green, Gillespie, La Salle and Zavala, as well as in Lea county, New Mexico. The infected animals include cattle, goats, sheep and one dog. The screwworm is a fly larva that burrows into open wounds on livestock and other warm-blooded animals, feeding on living tissue. For nearly six decades, the parasite was rarely seen in the US after being largely eradicated in the 1970s. However, its re-emergence and rapid spread have raised concerns that the parasite is making a comeback at a time when beef prices are at record highs. …