Three firefighters, three residents and two ambulance workers were sickened Monday night by fumes from a pesticide fogger set off in a San Mateo County trailer.

The San Mateo County Sheriff's Office and the Redwood City Fire Department responded to Sequoia Trailer Park in North Fair Oaks after receiving a 911 call requesting medical aid at about 8:10 p.m., Redwood City spokesman Malcolm Smith said.

Two residents who had apparently been using a fogger to exterminate fleas were found inside their trailer in a cloud of pesticide, Smith said.

Those two residents and a neighbor were washed off and taken to a hospital to be treated for shortness of breath and eye irritation, Smith said.

Three firefighters were also taken to a hospital as a precaution and later released.

A hazardous materials team responded to the trailer park to monitor the situation. No evacuations were necessary, according to the fire department.

Fire officials reminded residents to fallow all written instructions when handling household chemicals.