Health Care Professionals

Reporting Infectious Diseases

Viral infection concept, floating virus icons overlay on people walking on the street.

How to report

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.

Contact us by phone at 905-546-2063

Or by fax at 1-844-444-0295

How to Report

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.

Contact us by phone at 905-546-2063 or by fax at 1-844-444-0295

Report Immediately

Report Same Day

Report Next Business Day

Complete List of Reportable Infectious Diseases

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
Diseases caused by a novel coronavirus, including Severe Acute Respiratory Syndrome (SARS), Middle East Respiratory Syndrome (MERS) and coronavirus disease (COVID-19)
Diphtheria
Group A Streptococcal disease, invasive

Haemophilus influenzae disease, all types, invasive
Hantavirus pulmonary syndrome
Hemorrhagic fevers, including,
- i. Ebola virus disease
- ii. Marburg virus disease
- iii. Lassa fever, and other viral causes
Measles
Meningitis, acute - bacterial
Meningococcal disease, invasive

Plague
Poliomyelitis, acute
Q fever
Rabies
Smallpox and other orthopoxviruses, including monkeypox

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, outbreaks in institutions and public hospitals
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 and public hospitals

Rubella
Salmonellosis
Shigellosis
Tularemia
Typhoid fever
Verotoxin-producing E. coli infection, including Haemolytic Uraemic Syndrome (HUS)
Yersiniosis

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
Anaplasmosis
Babesiosis
Blastomycosis
Campylobacter enteritis
Carbapenemase-producing Enterobacteriaceae (CPE), infection or colonization
Candida auris infection
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
Powassan
Psittacosis/ Ornithosis
Rubella, congenital syndrome
Syphilis
Tetanus
Trichinosis
Tuberculosis
West Nile Virus Illness

Acquired Immunodeficiency Syndrome (AIDS)
Acute Flaccid Paralysis
Amebiasis
Anaplasmosis
Anthrax
Babesiosis
Blastomycosis
Botulism
Brucellosis
Campylobacter enteritis
Candida auris infection
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
Diseases caused by a novel coronavirus, including Severe Acute Respiratory Syndrome (SARS), Middle East Respiratory Syndrome (MERS) and coronavirus disease (COVID-19).
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, outbreaks in institutions and public hospitals
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. Lassa fever, and other viral causes
Hepatitis A, viral
Hepatitis B, viral
Hepatitis C, viral
Influenza
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
Powassan
Psittacosis/Ornithosis
Q Fever
Rabies
Respiratory infection outbreaks in institutions and public hospitals
Rubella
Rubella, congenital syndrome
Salmonellosis
Shigellosis
Smallpox and other orthopoxviruses, including Mpox
Syphilis
Tetanus
Trichinosis
Tuberculosis
Tularemia
Typhoid Fever
Verotoxin-producing E. coli infection, including Haemolytic Uremic Syndrome (HUS)
West Nile Virus Illness
Yersiniosis

Date modified

January 24, 2025