WITH REGIONAL BLOOD LEVELS BELOW NORMAL IN THE TRI CITIES, LOCAL AMERICAN RED CROSS OFFICIALS ARE MAKING AN URGENT PLEA TO THE PUBLIC FOR THEIR HELP. GWEN HUNTER, JOHNSON CITY DONOR CENTER COORDINATOR, SAYS THE CURRENT LOW SUPPLY OF BLOOD HAS RED CROSS OFFICIALS VERY CONCERNED. SHE ADDED THAT SUPPLIES TYPICALLY DROP OFF IN THE SUMMER DUE TO VACATIONS, SCHOOLS BEING OUT, AND BUSINESSES BEING OUT. THE MOST CRITCAL BLOOD TYPES RIGHT NOW ARE O POSITIVE, O NEGATIVE, A POSITIVE, AND A NEGATIVE. HOWEVER, ALL BLOOD TYPES ARE NEEDED.