THERMAL, Calif. (CNS) — Mosquitoes collected in Thermal tested positive for West Nile virus, the first detection of the virus in the city this year, the Coachella Valley Mosquito and Vector Control District announced Wednesday.

The mosquitoes were collected near 68th Avenue and Fillmore Street in Thermal, according to the district.

In response, mosquito-control technicians increased their presence in the Coachella Valley, carrying out control treatments in hopes of reducing any spread of the virus. District officials, however, urged residents to take precautions.

“Before going out, apply insect repellent containing the EPA- registered ingredients,” district public information officer Tammy Gordon said in a statement. “There is no cure or vaccine for West Nile virus, it’s not worth getting sick.”

CVMVCD’s control treatments consist of applying ultra low volume adulticides -- an insecticide used to kill mosquitoes with viruses.

To prevent mosquito bites, CVMVCD recommends people stay inside when the sun is below the horizon, wear insect repellent, wear covering clothing and ensure that window and door screens prevent mosquitoes from entering homes.

CVMVCD also recommends people clean water surfaces, sources and containers that have been sitting out for long periods of time.

A mosquito contracts the West Nile virus when it feeds on an infected bird. After that, the mosquito can transmit the virus to people through a bite.

No human cases of the virus have been reported this year in the Coachella Valley or the state.

According to CVMVCD, mild symptoms of the virus include fever, headaches, body aches, nausea, skin rash and swollen lymph nodes. The symptoms usually last a few days.

Severe symptoms that could require hospitalization include high fever, headache, neck stiffness, disorientation, coma, tremors and paralysis, according to CVMVCD. Such symptoms usually last several weeks.

The most susceptible groups are small children, the elderly and people with compromised immune systems.

More information about mosquito viruses and preventing the spread in the Coachella Valley can be found at CVMosquito.org.