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Disease Classifications
Class A Diseases (1)
Diseases of major public health concern because of the severity of disease or potential for epidemic spread • report by telephone immediately upon recognition that a case, a suspected case, or a positive laboratory result exists
| Anthrax |
Rabies, human |
| Botulism, foodborne |
Rubella (not congenital) |
| Cholera |
Severe Acute Respiratory Syndrome (SARS) |
| Diphtheria |
Smallpox |
| Measles |
Tularemia |
| Meningococcal disease |
Viral hemorrhagic fever (VHF) |
| Plague |
Yellow fever |
Any unexpected pattern of cases, suspected cases, deaths or increased incidence of any other disease of major public health concern, because of the severity of disease or potential for epidemic spread, which may indicate a newly recognized infectious agent, outbreak, epidemic, related public health hazard or act of bioterrorism.
Class A Diseases (2)
Diseases of pubic health concern needing timely response because of potential for epidemic spread • report by the end of the next business day after the existence of a case, a suspected case, or a positive laboratory result is known
Arboviral neuroinvasive and non-neuroinvasive disease
- Eastern equine encephalitis virus disease
- LaCrosse virus disease (other California serogroup virus disease)
- Powassan virus disease
- St. Louis encephalitis virus disease
- West Nile virus disease (also current infection)
- Western equine encephalitis virus disease
- Other arthropod-borne disease |
| Chancroid |
| Cyclosporiasis |
| Coccidioidomycosis * |
| Dengue |
| E. coli O157:H7 and other enterohemorrhagic (Shiga toxin-producing) E. coli |
| Foodborne disease outbreaks |
| Granuloma inguinale |
| Haemophilus influenzae (invasive disease) |
| Hantavirus |
| Hemolytic uremic syndrome (HUS) |
| Hepatitis A |
| Hepatitis B, perinatal |
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| Influenza-associated pediatric mortality |
| Legionnaires’ disease |
| Listeriosis |
| Lymphogranuloma venereum |
| Malaria |
| Meningitis, aseptic, including viral meningoencephalitis |
| Mumps |
| Pertussis |
| Poliomyelitis (including vaccine-associated cases) |
| Psittacosis |
| Q fever |
| Rubella (congenital) |
| Salmonellosis |
| Shigellosis |
| Staphylococcus aureus, with resistance or intermediate resistance to Vancomycin (VRSA, VISA) |
| Syphilis |
| Tetanus |
| Tuberculosis, including multi- drug resistant tuberculosis (MDR-TB) |
| Typhoid fever |
| Waterborne disease outbreaks |
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Class A Diseases (3)
Diseases of significant public health concern • report by the end of the work week after the existence of a case, a suspected case, or a positive laboratory result is known
| Amebiasis |
| Botulism, wound |
| Botulism, infant |
| Brucellosis |
| Campylobacteriosis |
| Chlamydia infections (urethritis, epididymitis, cervicitis, pelvic inflammatory disease, neonatal conjunctivitis and pneumonia) |
| Creutzfeldt-Jakob disease (CJD) |
| Cryptosporidiosis |
| Cytomegalovirus (CMV) (congenital) |
| Ehrlichiosis |
| Encephalitis, other viral |
| Encephalitis, post-infection |
| Giardiasis |
| Gonococcal infections (urethritis, cervicitis, pelvic inflammatory disease, pharyngitis, arthritis, endocarditis, meningitis and neonatal conjunctivitis) |
| Hepatitis B, non perinatal |
| Hepatitis C |
| Hepatitis D (delta hepatitis) |
| Hepatitis E |
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| Herpes (congenital) |
| Kawasaki disease (mucocutaneous lymph node syndrome) |
| Leprosy (Hansen disease) |
| Leptospirosis |
| Lyme disease |
| Meningitis, including other bacterial |
| Mycobacterial disease, other than tuberculosis (MOTT) |
| Reye syndrome |
| Rheumatic fever |
| Rocky Mountain spotted fever (RMSF) |
| Streptococcal disease, group A, invasive (IGAS) |
| Streptococcal disease, group B, in newborn |
| Streptococcal toxic shock syndrome (STSS) |
| Streptococcus pneumoniae, invasive disease (ISP) |
| Toxic shock syndrome (TSS) |
| Toxoplasmosis (congenital) |
| Trichinosis |
| Varicella |
| Vibriosis |
| Yersiniosis |
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Class B Diseases - the number of cases is to be reported by the close of each working week
Influenza
Class C Diseases - report an outbreak, unusual incidence, or epidemic by the end of the next working day
| Blastomycosis |
| Conjunctivitis, acute |
| Histoplasmosis |
| Nosocomial infections of any type |
| PediculosisScabies |
| Sporotrichosis |
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| Staphylococcal skin infections |
| Toxoplasmosis |
| Outbreak, unusual incidence, or epidemic of other infectious diseases of known etiology not categorized as Class A, Class B or Class C |
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Updated January 2006
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