Health Professionals

Reportable Infectious Diseases

Timely reporting can help minimize the spread of communicable diseases. If you suspect, or have confirmation of, any of the below named diseases or their etiologic agents specified in O. Reg. 135/18 Designation of Diseases under the Health Protection and Promotion Act, R.S.O. 1990, c. H.7, report this to the local Medical Officer of Health.

How to report? Contact us by phone at 905-546-2063 or by fax at 905-546-4078.

Diseases that should be reported immediately

Suspect and confirmed cases of these diseases must be reported immediately by calling 905-546-2063 or by fax (Monday to Friday 8:30 am to 4:30 pm only)

  • Anthrax
  • Botulism
  • Brucellosis
  • Cholera
  • Creutzfeldt-Jakob disease, all types
  • Diphtheria
  • Group A Streptococcal disease, invasive
  • Haemophilus influenzae disease, all types, invasive
  • Hantavirus pulmonary syndrome
  • Hemorrhagic fevers - Ebola, Marburg, other
  • Lassa fever
  • Measles
  • Meningitis, acute - bacterial
  • Meningococcal disease, invasive
  • Plague
  • Poliomyelitis, acute
  • Q fever
  • Rabies
  • Severe Acute Respiratory Syndrome (SARS)
  • Smallpox

Diseases that should be reported the same day

Suspect and confirmed cases of the following diseases should be reported same day by phone (8:30 am to 4:30 pm including weekends and holidays) or fax during business hours (Monday to Friday 8:30 am to 4:30 pm). Cases after hours, can be reported the next day by phone.

  • Acute flaccid paralysis
  • Clostridium difficile infection (CDI) outbreaks in public hospitals
  • Cryptosporidiosis
  • Cyclosporiasis
  • Encephalitis - primary, viral
  • Food poisoning, all causes
  • Gastroenteritis, institutional outbreaks
  • Giardiasis, except asymptomatic cases
  • Hepatitis A, viral
  • Hepatitis B, viral
  • Legionellosis
  • Listeriosis
  • Meningitis, acute - viral, other
  • Mumps
  • Paralytic shellfish poisoning
  • Paratyphoid fever
  • Pertussis (whooping cough)
  • Respiratory infection outbreaks in institutions
  • Rubella
  • Salmonellosis
  • Shigellosis
  • Tularemia
  • Typhoid fever
  • Verotoxin-producing E. coli infection, including Haemolytic Uraemic Syndrome (HUS)
  • Yersiniosis

Diseases that should be reported the next business day

Suspect and confirmed cases of the following diseases should be reported no later than next business day by phone or fax:

  • Acquired Immunodeficiency Syndrome (AIDS)
  • Amebiasis
  • Blastomycosis
  • Campylobacter enteritis
  • Carbapenemase-producing Enterobacteriaceae (CPE), infection or colonization
  • Chancroid
  • Chickenpox (varicella)
  • Chlamydia trachomatis infections
  • Echinococcus multilocularis infection
  • Encephalitis - post-infectious
  • Encephalitis - vaccine-related
  • Encephalitis - subacute sclerosing panencephalitis
  • Encephalitis - unspecified
  • Gonorrhea
  • Group B Streptococcal disease, neonatal
  • Hepatitis C, viral
  • Influenza
  • Leprosy
  • Lyme Disease
  • Ophthalmia neonatorum
  • Pneumococcal disease, invasive
  • Psittacosis/ Ornithosis
  • Rubella, congenital syndrome
  • Syphilis
  • Tetanus
  • Trichinosis
  • Tuberculosis
  • West Nile Virus Illness
  • Acquired Immunodeficiency Syndrome (AIDS)
  • Acute Flaccid Paralysis
  • Amebiasis
  • Anthrax
  • Blastomycosis
  • Botulism
  • Brucellosis
  • Campylobacter enteritis
  • Carbapenemase-producing Enterobacteriaceae (CPE), infection or colonization
  • Chancroid
  • Chickenpox (Varicella)
  • Chlamydia trachomatis infections
  • Cholera
  • Clostridium difficile infection (CDI) outbreaks in public hospitals
  • Creutzfeldt-Jakob Disease
  • Cryptosporidiosis
  • Cyclosporiasis
  • Diphtheria
  • Echinococcus multilocularis infection
  • Encephalitis, including,
    • i. Primary, viral
    • ii. Post-infectious
    • iii. Vaccine-related
    • iv. Subacute sclerosing panencephalitis
    • v. Unspecified
  • Food poisoning, all causes
  • Gastroenteritis, institutional outbreaks
  • Giardiasis, except asymptomatic cases
  • Gonorrhoea
  • Group A Streptococcal disease, invasive
  • Group B Streptococcal disease, neonatal
  • Haemophilus influenza disease, all types, invasive
  • Hantavirus pulmonary syndrome
  • Hemorrhagic fevers, including,
    • i. Ebola virus disease
    • ii. Marburg virus disease
    • iii. Other viral causes
  • Hepatitis A, viral
  • Hepatitis B, viral
  • Hepatitis C, viral
  • Influenza
  • Lassa Fever
  • Legionellosis
  • Leprosy
  • Listeriosis
  • Lyme Disease
  • Measles
  • Meningitis, acute,
    • i. bacterial
    • ii. viral
    • iii. other
  • Meningococcal disease, invasive
  • Mumps
  • Ophthalmia neonatorum
  • Paralytic Shellfish Poisoning
  • Paratyphoid Fever
  • Pertussis (Whooping Cough)
  • Plague
  • Pneumococcal disease, invasive
  • Poliomyelitis, acute
  • Psittacosis/Ornithosis
  • Q Fever
  • Rabies
  • Respiratory infection outbreaks in institutions
  • Rubella
  • Rubella, congenital syndrome
  • Salmonellosis
  • Severe Acute Respiratory Syndrome (SARS)
  • Shigellosis
  • Smallpox
  • Syphilis
  • Tetanus
  • Trichinosis
  • Tuberculosis
  • Tularemia
  • Typhoid Fever
  • Verotoxin-producing E. coli infection, including Haemolytic Uremic Syndrome (HUS)
  • West Nile Virus Illness
  • Yersiniosis

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