Mosquitoes are being trapped and frozen at Fort Benning and other posts as part of the military‘s effort to combat the Zika virus that has infected at least 11 service members among more than 1,000 Americans.

Army Pvt. 1st Class Mary Pendris at Benning in Georgia near the Alabama line is among those troops on mosquito trapping duty to detect the presence of the Aedes aegypti mosquitoes whose bites can spread the virus which can cause birth defects, including microcephaly, according to the Centers for Disease Control.

Once the mosquitoes are trapped at Benning, they are frozen and shipped to the Environmental Health Department of Preventative Medicine on the Georgia post, and then sent to the Army’s Public Health Command-Atlantic at Fort Meade in Maryland for testing.

“We haven’t found any, at least not yet,” of the Aedes aeqypti mosquitoes at Benning, although they are known to be present in the southeast, said Maj. Scott Robinson, chief of preventive medicine at Benning’s Martin Army Community Hospital.