Common infectious diseases are divided into three categories: Category A infectious diseases are plague and cholera. Category B infectious diseases, including infectious atypical pneumonia, AIDS, viral hepatitis, poliomyelitis, human highly pathogenic avian influenza, measles, epidemic hemorrhagic fever, rabies, epidemic BSE, dengue fever, anthrax, bacterial and amoebic dysentery, tuberculosis, typhoid and paratyphoid fever, epidemic cerebrospinal meningitis, pertussis, diphtheria, neonatal tetanus, scarlet fever, brucellosis, gonorrhea, syphilis, leptospirosis. Category C infectious diseases, including influenza, mumps, rubella, leprosy, black fever, cholera, encephalitis, filariasis, etc.