فيروس غرب النيل
Due to a citizen petition aimed at controlling mosquitoes emerging from the Los Angeles River, GLACVCD's first vector to control are mosquitoes. Mosquitoes are primary vectors in transmitting West Nile virus in California. The first reported sign of West Nile virus didn't appear until 2003. Since then, GLACVCD has been controlling mosquitoes as well as monitoring West Nile virus.