HARRIS COUNTY, Texas – There are a growing number of mosquito samples that have come into Harris County's Public Health Mosquito and Vector Division that have tested positive for the West Nile virus.
The number has risen from 18 samples on Tuesday to 32 on Friday.
READ: How to prevent mosquito-borne diseases
"So we found West Nile so far in several mosquito populations around the county," said Chris Freregill, field operations manager at the Harris County Public Health Mosquito and Vector Division. "It's normal for this time of the year, it starts to go around this time and builds up slowly, as soon as we get mosquito-positives, we send out vehicles to handle the area."
Even though it looks like mosquitoes are in full swing in recent weeks, Fredregill says that because of the cold winter here in Greater Houston, their numbers have actually dropped. Now the mosquito population is back to normal.
The accumulation of mosquito samples tested positive for West Nile is also common at this time of year and the county has a map on its website to show where these mosquito samples were found.
Fredregill says even if your West Nile area seems to be free, it's important to stay proactive.
The southern mosquito house contracts the virus of birds and these West Nile-positive mosquitoes can emerge everywhere.
"Just because your area is not positive for the West Nile virus or a mosquito-borne disease, keep the stagnant water to maintain your alertness and keep your property clean," Fredregill said.
When celebrating the Fourth of July holiday, remember to remember your EPA-approved bug spray along with your sunscreen.
Experts say that your mosquito repellent is most effective, first apply your sunscreen and then wait about 10 minutes. Then you can apply your bug spray.
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