THE VIRUS HAS LEFT THEIR TEENAGED SON PARALYZE AND FIGHTING FOR HIS LIFE. >> Reporter: TONIGHT, MORE AMERICAN FAMILIES IN AGONY. >> IT'S HARD TO SEE HIM LIKE THIS. >> Reporter: IN ST. LOUIS, JOHN PROCTOR'S ONCE HEALTHY 18-YEAR-OLD SON LIES PARALYZED ON A VENTILATOR AT BARNES JEWISH HOSPITAL AFTER JOHN SAYS HE GOT WEST NILE VIRUS FROM A MOSQUITO BITE EARLIER THIS MONTH. HOW DOES THAT HIT YOU THIS WAS IN ALL LIKELY DOCTORS SAY A MOSQUITO BITE, AND HERE WE ARE. >> IT'S HARD TO FATHOM HOW SUCH A MALL INSIGNIFICANT CREATURE CAN TAKE A PERFECTLY 100% HEALTHY HUMAN BEING AND MAKE IT SO THAT THEY CAN'T EVEN MOVE OR SUPPORT THEIR HEAD AND THEY CAN'T REGULATE THEIR BODY TEMPERATURE. AND IT'S CAUSING HAVOC ON HIS BODY THAT FAST. >> Reporter: THE PROCTOR FAMILY'S NIGHTMARE MARKING ANOTHER ALARMING SEVERE CASE OF MOSQUITO-BORNE VIRUS. TODAY, WISCONSIN PUBLIC HEALTH OFFICIALS REVEALING TWO PEOPLE THERE DIED THIS MONTH FROM WEST NILE. THE DEATHS IN WISCONSIN COME AS WEST NILE CASES HIT 33 STATES ACROSS THE COUNTRY. EXPERTS POINT TO A HOTTER, MORE HUMID SUMMER, CONDITIONS JUST RIGHT FOR MOSQUITOS TO THRIVE, SPREADING WEST NILE AND A DEADLY VIRUS CALLED EEE. HEALTH OFFICIALS IN MASSACHUSETTS TODAY ANNOUNCING A SECOND HUMAN CASE OF EASTERN EQUINE ENCEPHALITIS, A WOMAN IN HER 30s. FIVE STATES NOW REPORTING CASES AS THE EFFECTS OF MOSQUITO-BORNE ILLNESSES HIT HOME FOR A GROWING NUMBER OF FAMILIES. >> I KEEP TELLING HIM. LOOK AT MY FACE. IS DAD SCARED? AND THAT'S HOW WE GET THROUGH. >> Reporter: ARE YOU SCARED? >> I'M SCARED. I'M SCARED. >> Reporter: BB'S FAMILY IS INS