The tables below summarize reportable communicable disease data for the City of Toronto, for 2017 and the previous five year period (2012-2016). Monthly surveillance data for the current year are posted to Toronto Open Data and detailed summaries of 2017 data by gender and age group are also available on Open Data (see under Download Data tab on the Monthly Communicable Disease Surveillance Data for year specific data).

All reports of communicable diseases for Toronto included in this report were collected by Toronto Public Health (TPH) under the authority of the Health Protection and Promotion Act, Ontario Regulations 559/91, which mandates the notification of all confirmed or suspect reportable diseases to the Medical Officer of Health for the jurisdiction where the patient resides.

Reports of diseases included in this document are for individuals who lived in Toronto at the time of their diagnosis. All data for Toronto included in these tables were extracted from the Integrated Public Health Information System (iPHIS), the provincial communicable disease information system.

Incidence rates for Toronto were calculated using population estimates extracted from intelliHealth on April 30, 2018.

Note: Only those diseases with at least one reported case in 2017 are included on this page.

Ranking Reportable disease Cases (2017) Rate per 100,000 population
(5-year mean)
Cases
(5-year mean)
Rate per 100,000 population
(5-year mean)
1 Chlamydia 12,609 438.4 10,431 371.7
2 Influenza* 4,224 146.9 2,799 99.7
3 Gonorrhea 3,318 115.4 2,492 88.8
4 Syphilis, infectious 1,020 35.5 647 23.0
5 Campylobacter enteritis 832 28.9 903 32.2
6 Hepatitis C 694 24.1 718 25.6
7 Salmonellosis 619 21.5 638 22.7
8 Hepatitis B carriers 602 20.9 982 35.0
9 Chickenpox (Varicella) 512 17.8 815 29.0
10 HIV 500 17.4 439 15.6
11 Hepatitis B, unclassified 432 15.0 219 7.8
12 Giardiasis 400 13.9 391 13.9
13 Amebiasis 376 13.1 409 14.6
14 Syphilis, late latent 291 10.1 262 9.4
15 Tuberculosis 287 10.0 279 9.9
16 Pneumococcal disease, invasive 210 7.3 196 7.0
17 Mumps 138 4.8 4 0.1
17 Shigellosis 138 4.8 122 4.3
19 Group A Streptococcal disease, invasive 135 4.7 122 4.3
20 Cyclosporiasis 106 3.7 39 1.4
21 Lyme disease 78 2.7 31 1.1
22 Malaria 66 2.3 74 2.6
23 Yersiniosis 65 2.3 56 2.0
24 Cryptosporidiosis 64 2.2 60 2.2
25 Hepatitis A 63 2.2 32 1.2
26 Pertussis 57 2.0 69 2.5
27 Encephalitis/meningitis: viral 50 1.7 48 1.7
28 Legionellosis 37 1.3 39 1.4
29 Typhoid fever 33 1.1 21 0.8
30 West Nile Virus 28 1.0 29 1.0
31 Verotoxin-producing E. coli infection 26 0.9 29 1.0
32 AIDS 21 0.7 32 1.1
33 Encephalitis/meningitis: bacterial 20 0.7 20 0.7
34 Listeriosis 14 0.5 17 0.6
35 Encephalitis/meningitis: unclassified 13 0.5 4 0.1
36 Hepatitis B cases 9 0.3 12 0.4
36 Syphilis, other 9 0.3 4 0.1
38 Group B Streptococcal disease, neonatal 8 0.3 15 0.5
39 Creutzfeldt-Jakob disease 6 0.2 3 0.1
40 Measles 5 0.2 4 0.1
40 Meningococcal disease, invasive 5 0.2 6 0.2
42 Paratyphoid fever 4 0.1 12 0.4
43 Encephalitis/meningitis: fungal 3 0.1 2  <0.1
44 Cholera 2  <0.1 0 0.0
44 Q fever 2  <0.1 1  <0.1
46 Acute flaccid paralysis 1  <0.1  <1  <0.1
46 Brucellosis 1  <0.1 2  <0.1
46 Haemophilus influenzae b disease, invasive 1  <0.1 1  <0.1
46 Syphilis, congenital 1  <0.1  <1  <0.1
46 Trichinosis 1  <0.1  <1  <0.1

*Seasonal year from September 1, 2017 to August 31, 2018.

†Excludes infectious, late latent and congenital syphilis.

Communicable diseases without any cases reported in 2017 were not included in this table. These were: anthrax, botulism, chancroid, diphtheria, hantavirus, haemorrhagic fevers, and lassa.

These are infections caused by infectious agents that are found in bodily fluids such as blood, semen, vaginal secretions, breast milk and saliva. Transmission generally occurs from person to person via sexual contact, although other modes of transmission exist (e.g. IV drug use and perinatal transmission).

Sexually Transmitted and Bloodborne Cases (2017) Rate per 100,000 population
(5-year mean)
Cases
(5-year mean)
Rate per 100,000 population
(5-year mean)
Chlamydia 12,609 438.4 10,431 371.7
Gonorrhea 3,318 115.4 2,492 88.8
Syphilis, infectious 1,020 35.5 647 23.0
Hepatitis C 694 24.1 718 25.6
Hepatitis B carriers 602 20.9 982 35.0
HIV 500 17.4 439 15.6
Hepatitis B, unclassified 432 15.0 219 7.8
Syphilis, late latent 291 10.1 262 9.4
AIDS 21 0.7 32 1.1
Hepatitis B cases 9 0.3 12 0.4
Syphilis, other 9 0.3 4 0.1
Syphilis, congenital 1  <0.1  <1  <0.1

These are diseases caused by infectious agents that are shed in the feces and can contaminate food or water sources. Transmission occurs primarily through ingestion of contaminated food, beverages or water, or more rarely, though direct or fecal-oral contact with an infected person.

Enteric, Food and Waterborne Cases (2017) Rate per 100,000 population
(5-year mean)
Cases
(5-year mean)
Rate per 100,000 population
(5-year mean)
Campylobacter enteritis 832 28.9 903 32.2
Salmonellosis 619 21.5 638 22.7
Giardiasis 400 13.9 391 13.9
Amebiasis 376 13.1 409 14.6
Shigellosis 138 4.8 122 4.3
Cyclosporiasis 106 3.7 39 1.4
Yersiniosis 65 2.3 56 2.0
Cryptosporidiosis 64 2.2 60 2.2
Hepatitis A 63 2.2 32 1.2
Typhoid fever 33 1.1 21 0.8
Verotoxin-producing E. coli infection 26 0.9 29 1.0
Listeriosis 14 0.5 17 0.6
Paratyphoid fever 4 0.1 12 0.4
Cholera 2  <0.1 0 0.0
Trichinosis 1  <0.1  <1  <0.1

These are diseases caused by infectious agents transmitted through direct contact with, and/or droplet spread of, the contagious secretions of an infected person, usually secretions from the respiratory tract.

Direct Contact and Respiratory Cases (2017) Rate per 100,000 population
(5-year mean)
Cases
(5-year mean)
Rate per 100,000 population
(5-year mean)
Tuberculosis 287 10.0 279 9.9
Pneumococcal disease, invasive 210 7.3 196 7.0
Group A Streptococcal disease, invasive 135 4.7 122 4.3
Legionellosis 37 1.3 39 1.4
Group B Streptococcal disease, neonatal 8 0.3 15 0.5
Meningococcal disease, invasive 5 0.2 6 0.2

These are diseases caused by agents which can be spread a variety of ways, but for which there are effective vaccines readily available and routinely used.


Vaccine Preventable Diseases Cases (2017) Rate per 100,000 population
(5-year mean)
Cases
(5-year mean)
Rate per 100,000 population
(5-year mean)
Influenza 4,224 146.9 2,799 99.7
Chickenpox (Varicella) 512 17.8 815 29.0
Mumps 138 4.8 4 0.1
Pertussis 57 2.0 69 2.5
Measles 5 0.2 4 0.1
Haemophilus influenzae b disease, invasive 1  <0.1 1  <0.1

These are diseases caused by infectious agents transmitted between animals and humans. Most transmission occurs through the bite of an arthropod (mosquito and tick), which introduces infectious agents into the bloodstream.


Vectorborne and Zoonotics Cases (2017) Rate per 100,000 population
(5-year mean)
Cases
(5-year mean)
Rate per 100,000 population
(5-year mean)
Lyme disease 78 2.7 31 1.1
Malaria 66 2.3 74 2.6
West Nile Virus 28 1.0 29 1.0
Q fever 2  <0.1 1  <0.1
Brucellosis 1  <0.1 2  <0.1

 


Human Prion Disease Cases (2017) Rate per 100,000 population
(5-year mean)
Cases
(5-year mean)
Rate per 100,000 population
(5-year mean)
Creutzfeldt-Jakob disease 6 0.2 3 0.1

 


Encephalitis and meningitis are illnesses caused by a variety of organisms which lead to inflammation of the brain and/or membranes surrounding the brain and spinal cord. Rare diseases are those that are observed infrequently in Toronto.


Encephalitis/Meningitis Cases (2017) Rate per 100,000 population
(5-year mean)
Cases
(5-year mean)
Rate per 100,000 population
(5-year mean)
Encephalitis/meningitis: viral 50 1.7 48 1.7
Encephalitis/meningitis: bacterial 20 0.7 20 0.7
Encephalitis/meningitis: unclassified 13 0.5 4 0.1
Encephalitis/meningitis: fungal 3 0.1 2  <0.1

 


Rare Diseases Cases (2017) Rate per 100,000 population
(5-year mean)
Cases
(5-year mean)
Rate per 100,000 population
(5-year mean)
Acute flaccid paralysis 1 <0.1 <1 <1