STATE HEALTH OFFICIALS HAVE REPORTED TWO CONFIRMED CASES OF WEST NILE VIRUS.      TWO PATIENTS FROM CONTRA COSTA AND SAN JOAQUIN COUNTIES WERE THE FIRST TO TEST POSITIVE FOR THE VIRUS THIS SEASON.    THE PATIENT FROM CONTRA COSTA HAS RECOVERED AND BEEN RELEASED FROM THE HOSPITAL.    THE SAN JOAQUIN PATIENT IS CURRENTLY NOT SHOWING SYMPTOMS.     WEST NILE IS TRANSMITTED TO HUMANS AND ANIMALS BY MOSQUITO BITES.    TO LEARN MORE, VISIT WESTNILE.CA.GOV.