Infectious Diseases - Statistics in Niagara

Infectious diseases can be spread from one person to another, directly or indirectly, through fluid exchange, exposure to vectors, or from the environment. Niagara Region Public Health receives information about and follows up all reportable diseases as identified in Ontario Regulation 559/91 and under the Ontario Health Protection and Promotion Act.

This section contains incidence data for Niagara region related to select infectious diseases.

For more information, see infectious disease trends in Ontario.

Direct contact and respiratory infections Top of Page

Infectious diseases that can be spread by touching people or objects that have germs on them and diseases that can be spread from a sick person's cough or sneeze.

Diseases Number of cases January - March 2024 Number of cases April - June 2024 Number of cases July - September 2024 Number of cases October - December 2024 Year-to-date 2024 Comparison to three-year average in Niagara
Acute Flaccid Paralysis 0 0 0 0 0
Encephalitis / Meningitis <5 <5 <5 <5 12
Group A Streptococcal disease, invasive 20 19 18 16 73
Group B Streptococcal disease, neonatal 0 <5 0 <5 <5
Influenza A, laboratory confirmed 617 51 20 99 787
Influenza B, laboratory confirmed 201 62 0 <5 264
Legionellosis <5 <5 9 <5 16
Meningococcal Disease, invasive <5 0 0 0 <5
Tuberculosis, active <5 <5 <5 <5 10

Source: Integrated Public Health Information System [2025].

Three-year average based on 2021-2023 data, rounded to nearest whole number

All reportable disease data are stored in and retrieved from the provincially mandated Integrated Public Health Information System (iPHIS). Only confirmed cases are provided.

Infectious disease data may be underreported due to testing availability, case and contact management guidelines and delays in data entry.

Food, waterborne and enteric infections Top of Page

Infectious diseases that can be spread by eating or drinking contaminated food or water and not cleaning your hands.

Diseases Number of cases January - March 2024 Number of cases April - June 2024 Number of cases July - September 2024 Number of cases October - December 2024 Year-to-date 2024 Comparison to three-year average in Niagara
Amebiasis <5 <5 <5 <5 6
Campylobacter Enteritis 16 32 34 27 109
Cryptosporidiosis 5 5 20 <5 33
Cyclosporiasis <5 <5 12 0 16
Giardiasis <5 <5 13 <5 24
Hepatitis A 0 <5 0 <5 5
Listeriosis 0 <5 <5 <5 5
Paratyphoid Fever 0 <5 0 0 <5
Salmonellosis 23 14 32 16 85
Shigellosis <5 0 <5 0 <5
Typhoid fever 0 <5 0 0 <5
Trichinosis 0 0 0 0 0
Verotoxin-Producing E. coli Including HUS) <5 <5 <5 <5 5
Yersiniosis <5 <5 <5 <5 6

Source: Integrated Public Health Information System [2025].

Three-year average based on 2021-2023 data, rounded to nearest whole number

All reportable disease data are stored in and retrieved from the provincially mandated Integrated Public Health Information System. Only confirmed cases are provided.

Infectious disease data may be underreported due to testing availability, case and contact management guidelines and delays in data entry.

Sexually transmitted and bloodborne infections Top of Page

Infections that can be spread through sexual contact and exposure to infected fluids, such as semen, vaginal fluid and blood.

Diseases Number of cases January - March 2024 Number of cases April - June 2024 Number of cases July - September 2024 Number of cases October - December 2024 Year-to-date 2024 Comparison to three-year average in Niagara
AIDS 0 0 <5 0 <5
HIV 19 23 11 8 61
Chlamydia 350 328 325 301 1,304
Gonorrhea 58 83 81 100 322
Hepatitis C 33 36 31 26 126
Syphilis 48 56 50 43 197

Source: Integrated Public Health Information System [2025].

Three-year average based on 2021-2023 data, rounded to nearest whole number

All reportable disease data are stored in and retrieved from the provincially mandated Integrated Public Health Information System. Only confirmed cases are provided.

Infectious disease data may be underreported due to testing availability, case and contact management guidelines and delays in data entry.

Vaccine preventable infections Top of Page

Infectious diseases that can be controlled and/or avoided by getting recommended immunizations.

Diseases Number of cases January - March 2024 Number of cases April - June 2024 Number of cases July - September 2024 Number of cases October - December 2024 Year-to-date 2024 Comparison to three-year average in Niagara
Hepatitis B <5 0 0 <5 <5
Diphtheria 0 0 0 0 0
Chickenpox (Varicella) <5 <5 <5 <5 13
Measles 0 0 0 0 0
Mumps 0 <5 0 0 <5
Pertussis (Whooping Cough) 0 <5 23 <5 28
Rubella 0 0 0 0 0
Streptococcus pneumoniae, invasive 20 19 10 33 82
Tetanus 0 0 0 0 0

Source: Integrated Public Health Information System [2025].

Three-year average based on 2021-2023 data, rounded to nearest whole number

All reportable disease data are stored in and retrieved from the provincially mandated Integrated Public Health Information System. Only confirmed cases are provided.

Infectious disease data may be underreported due to testing availability, case and contact management guidelines and delays in data entry.

Vectorborne and zoonotic infections Top of Page

Infectious diseases that can be spread from infected insects or animals.

Diseases Number of cases January - March 2024 Number of cases April - June 2024 Number of cases July - September 2024 Number of cases October - December 2024 Year-to-date 2024 Comparison to three-year average in Niagara
Brucellosis 0 0 0 0 0  
Lyme <5 11 20 <5 33
West Nile Virus 0 0 <5 0 <5

Source: Integrated Public Health Information System [2025].

Three-year average based on 2021-2023 data, rounded to nearest whole number

All reportable disease data are stored in and retrieved from the provincially mandated Integrated Public Health Information System. Only confirmed cases are provided.

Infectious disease data may be underreported due to testing availability, case and contact management guidelines and delays in data entry.

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