Diseases of Public Health Significance

Diseases of public health significance must be reported to the Medical Officer of Health immediately or by the next working day. PDF version (260 kb)

To be reported immediately

The following diseases must be reported immediately to the Medical Officer of Health in accordance with Ontario Regulations 135/18 and amendments under the Health Protection and Promotion Act:

 

• Anthrax
• Botulism
• Brucellosis
• Carbapenemase-producing Enterobacteriaceae (CPE) outbreaks
• Clostridium difficile infection (CDI) outbreaks and outbreak-associated cases within hospitals, preliminary notification
• Creutzfeldt-Jakob disease, all types
• Cyclosporiasis
• Diphtheria
• Diseases caused by a novel coronavirus, including Severe Acute Respiratory Syndrome (SARS), Middle East Respiratory Syndrome (MERS) and coronavirus disease (COVID-19)
• Food poisoning, all causes
• Gastroenteritis, institutional outbreaks
• Group A Streptococcal disease, invasive
• Haemophilus influenzae disease, all types, invasive
• Hantavirus pulmonary syndrome (HPS)
• Hemorrhagic fevers, including:
  1. Ebola virus disease
  2. Marburg virus disease
  3. Other viral causes
• Hepatitis A, viral
• Influenza, laboratory confirmed cases of novel (not seasonal)
• Lassa fever
• Legionellosis
• Listeriosis
• Measles
• Meningitis, acute:
  1. Bacterial
  2. Viral
  3. Other
• Meningococcal disease, invasive
• Mumps
• Novel coronavirus
• Paralytic shellfish poisoning (PSP)
• Pertussis (Whooping cough)
• Plague
• Poliomyelitis, acute
• Q fever
• Rabies
• Respiratory infection outbreaks in institutions and public hospitals
• Rubella
• Rubella, congenital syndrome
• Salmonellosis
• Shigellosis
• Smallpox and other orthopoxviruses, including monkeypox (now referred to as mpox)
• Tetanus
• Tuberculosis (all sites)
• Tularemia
• Verotoxin-producing E.coli infection indicator conditions including hemolytic uremic syndrome
• West Nile Virus illness:
  1. Neurological Syndromes
  2. Non-Neurologic Syndromes
  3. Asymptomatic Infection
• Yersiniosis

To be reported by next working day

The following diseases must be reported by the next working day to the Medical Officer of Health in accordance with Ontario Regulations 135/18 and amendments under the Health Protection and Promotion Act:

• *Acquired immunodeficiency syndrome (AIDS)
• Acute flaccid paralysis (AFP)
• Adverse Event Following Immunization (AEFIs)
• Amebiasis
• Anaplasmosis
• Babesiosis
• Blastomycosis
• Campylobacter enteritis
• Carbapenemase-producing Enterobacteriaceae (CPE) colonizations and infections (cases)
• Chancroid
• Chickenpox (Varicella)
• Chlamydia trachomatis infections
• Cholera
• Cryptosporidiosis
• Echinococcus multilocularis infection
• Encephalitis, including:
  1. Primary, viral
  2. Post-infectious
  3. Vaccine-related
  4. Subacute sclerosing panencephalitis
  5. Unspecified
• Giardiasis
• Gonorrhea
• Group B Streptococcal disease, neonatal
• Hepatitis, viral:
  1. Hepatitis B
  2. Hepatitis C
• Influenza, seasonal cases
• Leprosy
• Lyme disease
• Ophthalmia neonatorum
• Paratyphoid fever
• Powassan Virus Infection
• Pneumococcal disease, invasive
• Psittacosis/Ornithosis
• Syphilis
• Trichinosis
• Typhoid fever

*Although not on the list of reportable diseases, Human Immunodeficiency Virus (HIV) infection is also reportable to the Medical Officer of Health since it is the agent responsible for AIDS.

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This item was last modified on July 4, 2024