TAKE A FULL LOOK AT THE FORECAST IN A FEW MINUTES. >>> MOSQUITOES THRIVE IN WET CONDITIONS. THREE COMMUNITIES ARE ON HIGH ALERT FOR TRIPLE E. THERE HAVEN'T BEEN ANY REPORTED HUMAN INFECTIONS YET BUT A HORSE IN PLYMOUTH HAS THE DISEASE AND THERE ARE SEVERAL COMMUNITIES IN MASSACHUSETTS RIGHT NOW THAT ARE AT EITHER MODERATE OR HIGH RISK FOR MOSQUITO BORN VIRUSES. WBZ'S TIFFANY CHAN IS LIVE IN MIDDLEBORO TONIGHT. >> Reporter: HEALTH OFFICIALS IN CARVER, PLYMOUTH, ASKING PEOPLE TO STAY INDOORS DURING DUSK UNTIL DAWN WHICH COULD BE HARD. I DID SPEAK TO SOME PEOPLE WHO SAY THEY ARE BUSTING OUT THAT BUG SPRAY. >> MIDDLEBORO IS AT HIGH RISK. >> Reporter: HIGH RISK OF TRIPLE E IN CARVER, MIDDLEBORO AND NOW PLYMOUTH AFTER A HORSE TESTED POSITIVE FOR THE VIRUS. OFFICIALS ARE ASKING RESIDENTS NOT TO PANIC BUT KEEP AN EYE OUT FOR MOSQUITOES IF YOU SPEND A LOT OF TIME OUTSIDE. >> I READ IT WAS AT A HIGHER RISK FOR TRIPLE E. I DON'T KNOW WHY. >> Reporter: THE TOWN'S LANDSCAPE IS BLAMED AND THIS RAINY SUMMER. >> AND WE HAVE A LOT OF LAND. SO THAT INCLUDES WETLANDS. >> Reporter: TRIPLE E LINGERING IN PEOPLE'S MINDS AFTER THE SUMMER OF 2019 WHEN SIX PEOPLE DIED AFTER GETTING BITTEN BY THE INFECTED MOSQUITOES. >> IT MAKES ME NERVOUS NOR THE KIDS. >> Reporter: PRECAUTIONS START WITH TRYING TO STAY INDOORS FROM DUSK UNTIL DAWN. >> TRY TO AVOID THE OUTSIDE PARTIES THOUGH IT IS THE SUMMER. WEAR LONG SLEEVES OR ANY BUG REPELLANT THAT YOU CAN. AND IF YOU START FEELING SICK, HEADACHES, NAUSEA, DIZZINESS, HEAD ISSUES, CONTACT YOUR DOCTOR IMMEDIATELY. >> Reporter: RESIDENT SAM MOSHER SAW THE TOWN'S ONLINE ALERT AND HE IS TAKING PRECAUTIONS. >> JUST THAT IT WAS SUPPOSED TO BE REALLY BAD BECAUSE OF THE RAIN AND DANGEROUS. >> Reporter: NOW DEADHAM'S TRIPLE E RISK WAS ELEVATED TO LOW