CDC SAYS IT'S PREPARING FOR A POSSIBLE INCREASED RISK OF BIRD FLU TO HUMAN HEALTH. >> THIS IS THE VIRUS CONTINUES TO SPREAD AMONG CATTLE. THE ORGANIZATION SAYS BIRD FLU HAS AFFECTED HERDS OF NEARLY A DOZEN STATES SO FAR AND WAS FOUND IN BEEF TISSUE FROM A SICK COW ON FRIDAY. SO FAR, ONLY 2 FARM WORKERS HAVE TESTED POSITIVE FOR THE VIRUS AFTER COMING INTO CONTACT WITH INFECTED ANIMALS. DOCTORS SAY THERE'S NO EVIDENCE OF PERSON TO PERSON TRANSMISSION, BUT THEY ARE TAKING STEPS TO