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Communicable Disease Case Counts

Communicable disease case counts are shown below for vaccine preventable diseases, selected communicable diseases, and sexually transmitted infections in suburban Cook County. Case counts are provided quarterly for the current year only. 

Additional communicable disease surveillance data can be viewed in our surveillance web application located here, or in our health equity application located here.

Vaccine Preventable Diseases2022-Q4*202120202019201820175-yr Median
Diphtheria0000000
Haemophilus Influenzae†33161548345034
Hepatitis B (Acute) 84310414
Hepatitis B (Chronic) 251356324282258262282
Measles0001100
Mumps52212343912
Pertussis (Whooping Cough)138681102712068
Pneumococcal Disease (Invasive)¶32344114
Rubella0000000
Tetanus0000000
Varicella (Chickenpox)38301359786959
Selected Communicable Diseases2022-Q4*202120202019201820175-yr Median
Campylobacteriosis302271244378344332332
Cryptosporidiosis65403360533840
E.coli O157:H74718888
Hepatitis A73824131212
Hepatitis C (Chronic)4585794656477921093647
Histoplasmosis21411516183618
Legionnaires' Disease931455713012975129
Listeriosis4540885
Lyme Disease251162245275645
Malaria107115161212
Meningococcal Disease0122122
Salmonellosis272260216347336304304
Shigellosis78544077445050
Streptococcal Invasive (Group A)54337568744868
Tuberculosis 65625372848672
Typhoid Fever1143101655
West Nile Virus (Neuroinvasive)916127372016
Sexually Transmitted Infections202020192018201720165-yr Median
Chlamydia10,59912,33311,72611,24410,45611,244
Gonorrhea4,0073,5733,1732,9412,5552,941
HIV (Any Stage) **271238241246246
Syphilis§167172196178189178

Excludes Chicago, Evanston, Oak Park, Skokie and Stickney Township. For tuberculosis, excludes Chicago only.
* Provisional cases through the fourth quarter of 2022
† Includes type B
¶ Reportable only in those under 5 years of age
§ Primary and secondary syphilis
** Due to reporting lags, data are not available

Updated January 6, 2023, 3:53 PM