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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 Diseases2023-Q2*202220212020201920185-yr Median
Diphtheria0000000
Haemophilus Influenzae†18361615483434
Hepatitis B (Acute) 28431044
Hepatitis B (Chronic) 158260353324282256282
Measles0000110
Mumps452212345
Pertussis (Whooping Cough)18158681102727
Pneumococcal Disease (Invasive)¶4323443
Rubella0000000
Tetanus0000000
Varicella (Chickenpox)27393013597839
Selected Communicable Diseases2023-Q2*202220212020201920185-yr Median
Campylobacteriosis156309271244378344309
Cryptosporidiosis20674033605353
E.coli O157:H71471887
Hepatitis A683824138
Hepatitis C (Chronic)285427579468648792579
Histoplasmosis11224115161818
Legionnaires' Disease259214557130129129
Listeriosis6454084
Lyme Disease182711622452727
Malaria51171151611
Meningococcal Disease1012211
Salmonellosis115275260216347336275
Shigellosis32835440774454
Streptococcal Invasive (Group A)102493375687468
Tuberculosis 37656253728465
Typhoid Fever21143101610
West Nile Virus (Neuroinvasive)09161273712
Sexually Transmitted Infections2022202120202019201820175-yr Median
Chlamydia**11,21410,59812,33311,72611,24411,244
Gonorrhea**3,9764,0073,5733,1732,9413,573
HIV (Any Stage) **265214271238241241
Syphilis§**277167172196178178

Excludes Chicago, Evanston, Oak Park, Skokie and Stickney Township. For tuberculosis, excludes Chicago only.
* Provisional cases through the second quarter of 2023
† 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 August 9, 2023, 10:10 AM