Though no new Vesicular Stomatitis Virus infections have been identified since April 23, 2020, three additional premises have been identified in Arizona, all in Maricopa County, reports the United States Department of Agriculture. Two of the premises have been confirmed positive and one is suspected as having VSV. Once a county is confirmed as having a positive VSV case, new premises that have animals presenting with clinical signs can be quarantined and classified as a suspect premise without additional testing.
Quarantines last for a minimum of 14 days from the onset of lesions in the last affected animal on the premises.
New Mexico has had one premise released from quarantine in De Baca County. Texas has had one premise released from quarantine in Hudspeth County.
The 2020 VSV outbreak began on April 13 in Dona Ana County, New Mexico. Arizona and Texas subsequently broke with VSV cases which were confirmed on April 22, 2020 (Cochise County, Arizona) and April 23, 2020 (Starr County, Texas).
Since the start of the outbreak, 37 VSV-affected premises have been identified (33 confirmed positive, 4 suspect); 33 of these premises had mainly horses affected by VSV and four premises had cattle affected. Arizona has identified 11 affected premises in Cochise, Gila, Maricopa, Pima, Pinal and Santa Cruz Counties. New Mexico has identified 16 affected premises in six counties: De Baca, Dona Ana, Eddy, Grant and Sierra. Texas has identified 10 affected premises in El Paso, Hudspeth, Kerr, McMullen, Starr, and Zapata counties.
There are 23 previously VSV-infected or suspect premises that have been released from quarantine; 14 premises remain under VSV quarantine.
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