The San Gabriel Valley Mosquito & Vector Control District continues to find evidence of West Nile virus (WNV) in the San Gabriel Valley. Tests conducted this week identified WNV in another of the District’s chicken flocks located just north of the main campus of the Claremont Colleges in the city of Claremont
The District routinely tests mosquitoes, birds, and chickens from flocks it maintains throughout the San Gabriel Valley as part of its disease surveillance program.
Residents are urged to take precautions against mosquito bites as transmission is expected to continue throughout the summer and fall months.
So far this year the Los Angeles County Department of Public Health reports a total of 74 human infections in Los Angeles County.
- 46 are listed as the more severe West Nile neuroinvasive disease (WNND)
- 15 are the milder West Nile fever (WNF)
- 13 are asymptomatic blood donors
Only one in approximately 150 infections result in severe illness, however 62% percent of cases reported this year have been the more severe West Nile neuroinvasive disease. It is entirely possible that more than 1,300 cases of WNV in Los Angeles County this year have not been tested and reported. This has District officials very concerned.


from the San Gabriel Valley Mosquito Control & Vector Control District
The District routinely tests mosquitoes, birds, and chickens from flocks it maintains throughout the San Gabriel Valley as part of its disease surveillance program.
Residents are urged to take precautions against mosquito bites as transmission is expected to continue throughout the summer and fall months.
So far this year the Los Angeles County Department of Public Health reports a total of 74 human infections in Los Angeles County.
Only one in approximately 150 infections result in severe illness, however 62% percent of cases reported this year have been the more severe West Nile neuroinvasive disease. It is entirely possible that more than 1,300 cases of WNV in Los Angeles County this year have not been tested and reported. This has District officials very concerned.