Oregon health officials have issued a public health advisory about new cases of West Nile virus.

PORTLAND — Oregon health officials have issued a public health advisory about new cases of West Nile virus.

Six cases of the mild, flu-like disease spread by mosquitoes have been reported recently by the Oregon State Public Health Laboratory.

The Oregon Department of Human Services is advising the public to take precautions against mosquitoes in order to avoid the risk of infection.

Precautions include eliminating sources of standing water that are a breeding ground for mosquitoes, avoiding outdoor activities at dusk and dawn when mosquitoes are most active, and long-sleeved shirts and long pants.

The current cases of West Nile virus appear to be concentrated along the Columbia River in Eastern Oregon and in Baker and Malheur counties.

Tests have also found West Nile virus in birds and horses in those counties and in Baker County.