A recent spike in West Nile virus activity has Los Angeles County health officials urging caution and awareness.

As of Nov. 14, 2017, 235 people in the county have been infected by the disease and 17 people have died, according to the Los Angeles County Department of Public Health.

We’ve mapped out all the Valley communities where mosquito samples and dead birds have tested positive for West Nile virus so far in 2017.

• RELATED STORY: San Fernando Valley West Nile Virus cases spark ‘heightened concern’

Residents are urged to take precautions during warm temperatures by remembering the three D’s:

• DEET: Use it as insect repellent.

• Dawn and dusk: Mosquitoes bite in the early morning and evening.

• Drain: Eliminate all sources of standing water on your property, because that’s where mosquitoes breed.

Source: Greater Los Angeles County Vector Control District

Staff writer Susan Abram contributed to this report.