text: it is a virus..it mutates over time..\nthe question you should be asking is how to make your eniviroment safe for you...\n1. good hygene..keep your hands clean,maybe even wear gloves\n2.do not touch your face with unclean hands.\n3. do not touch dead birds or cats that roam out side.\n4. whatch out for cats who may carry it from eating infected birds or rodents