Fresno County Department of Public Health

Fresno County is warning residents that mosquito-borne illnesses are on the rise.

At a press conference earlier this week, Joe Prado of the Department of Public Health reported that so far this year, Fresno County has already seen three times as many cases of West Nile Virus as in all of 2013.

Prado: “We are now up to 23 cases to date. If this trend continues we will exceed our highest year, which was back in 2005, where we had 68 cases.”

Fresno County Department of Public Health

Two different types of mosquitoes – one that carries West Nile Virus and another that can spread dengue and yellow fever have Fresno County health officials on high alert.

The county says a crow reported earlier this month tested positive for West Nile Virus. Officials have also detected the presence of another invasive mosquito species that can spread potentially serious tropical diseases. In severe cases, the more serious symptoms stemming from these diseases can lead to death.

David Luchini is the assistant director for the county’s Department of Public Health.

Fresno County Public Health Department

The Fresno County Public Health Department has announced that yellow fever  mosquitoes have been found two more valley cities. The mosquitoes, which are not native to California, were discovered earlier this week in the cities of Fowler and Fresno.

It’s not the first time the potentially dangerous insects have been spotted in the county. In June, the mosquitoes were detected in Clovis. They have also been found in Madera County and San Mateo County.