An outbreak of New World Screwworm in the United States began in 2026.
The outbreak threatens the cattle industry in Texas.
Cases As of September 5, 2026, there are 48 known NWS cases in the US.
+ 2026 Table of NWS Cases in the United States Confirmed Date State County Case Type Animal Type Species June 3, 2026 Texas Zavala Domestic Domestic Cattle June 5, 2026 Texas Zavala Domestic Domestic Cattle June 7, 2026 Texas La Salle Domestic Domestic Cattle June 7, 2026 New Mexico Lea Domestic Domestic Dog June 8, 2026 Texas La Salle Domestic Domestic Cattle June 8, 2026 Texas Gillespie Domestic Domestic Goats June 9, 2026 Texas Edwards Domestic Domestic Cattle June 11, 2026 Texas Zavala Domestic Domestic Cattle June 11, 2026 Texas Tom Green Domestic Domestic Cattle June 11, 2026 Texas Edwards Domestic Domestic Cattle June 11, 2026 Texas Edwards Domestic Domestic Goats June 12, 2026 Texas Sutton Domestic Domestic Sheep June 20, 2026 Texas Crockett Domestic Domestic Sheep June 21, 2026 Texas Edwards Domestic Domestic Cattle June 21, 2026 Texas Edwards Domestic Domestic Cattle June 22, 2026 Texas Terrell Domestic Domestic Goats June 23, 2026 Texas Terrell Domestic Domestic Cattle June 23, 2026 Texas Terrell Domestic Domestic Cattle June 23, 2026 Texas Terrell Domestic Domestic Cattle June 24, 2026 Texas Medina Domestic Domestic Cattle June 24, 2026 Texas Edwards Domestic Domestic Sheep June 24, 2026 Texas Crockett Domestic Domestic Sheep June 24, 2026 Texas Crockett Domestic Domestic Sheep June 24, 2026 Texas Crockett Domestic Domestic Sheep June 24, 2026 Texas Crockett Domestic Domestic Sheep June 26, 2026 Texas Jim Hogg Domestic Domestic CattleJune 27, 2026TexasCrockettDomesticDomesticCattleJune 29, 2026TexasPecosDomesticDomesticDogJune 29, 2026TexasUvaldeDomesticDomesticSheepJune 30, 2026TexasCrockettDomesticDomesticSheepJuly 3, 2026TexasCrockettDomesticDomesticSheepJuly 7, 2026TexasCrockettDomesticDomesticCattleJuly 9, 2026TexasBrewsterDomesticDomesticCattleJuly 10, 2026TexasCrockettDomesticDomesticGoatsJuly 13, 2026TexasSuttonDomesticDomesticDogJuly 13, 2026TexasBrewsterDomesticDomesticCattleJuly 14, 2026TexasPecosDomesticDomesticSheepJuly 14, 2026TexasPecosDomesticDomesticSheepJuly 17, 2026TexasStarrDomesticDomesticCattleJuly 18, 2026TexasScheleicherDomesticDomesticSheepJuly 21, 2026TexasSuttonDomesticDomesticGoatsJuly 29, 2026TexasBrewsterDomesticDomesticCattleJuly 30, 2026TexasBrewsterDomesticDomesticCattleJuly 31, 2026TexasPecosDomesticDomesticSheepAugust 5, 2026TexasTerrellDomesticDomesticSheepAugust 16, 2026TexasVal VerdeDomesticDomesticSheepAugust 25, 2026TexasVal VerdeDomesticDomesticGoatsAugust 31, 2026TexasCrockettDomesticDomesticDog
Domestic response The USDA has released sterile screwworm flies in Texas, a technique that has eradicated screwworm from the United States previously. In June, Texas governor Greg Abbott pledged to assist the USDA to accelerate the construction of a sterile screwworm fly factory in Texas.
International response On June 5, 2026, Canada instituted a ban on imported cattle that were in Texas within the past 21 days.
In June 2026, Mexico halted most livestock imports from the United States.
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