Texas agricultural officials have issued emergency quarantines in 21 counties due to the presence of the screwworm parasite. The parasite has been confirmed in 26 cases in the United States. Further details on the quarantines and the affected areas can be found through federal and state agricultural officials.

The emergency measures are aimed at containing the parasite's spread in Deep South Texas. For more information on the screwworm parasite and the quarantine orders, readers can refer to the source, which provides updates on the situation and the efforts to combat the parasite's expansion.