Coconino County Health and Human Services (CCHHS) officials confirmed a second mosquito pool has tested positive for West Nile virus (WNV). The mosquito sample was taken from the Cheshire area in northwest Flagstaff.Coconino County Health and Human Services (CCHHS) officials confirmed a second mosquito pool has tested positive for West Nile virus (WNV). The mosquito sample was taken from the Cheshire area in northwest Flagstaff.