Communicable Diseases

Communicable diseases are infectious diseases that are spread from person to person (e.g., E.coli, salmonella, chickenpox) or from animals to people (e.g., rabies, H1N1). We prevent the spread of infectious diseases through disease surveillance, community education, outbreak response and by providing recommendations to control the spread of communicable diseases in suburban Cook County. There are about 65 communicable diseases that are reportable to the Cook County Department of Public Health (CCDPH) by healthcare providers and hospitals. The CCDPH Reportable Diseases poster indicates which diseases to report and in what timeframe and is available for download in two sizes: letter-size (8.5X11, PDF) and pocket-size (5X7, PDF)

Communicable Disease Case Counts

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

Vaccine Preventable Diseases 2010 2011 2012 2013 2014 5-yr Median 2015-Q1*
Diphtheria 0 0 0 0 0 0 0
Haemophilus Influenzae 32 23 26 26 23 26 5
Hepatitis B              
  Acute 26 25 15 23 6 25 2
  Chronic 326 315 264 371 246 326 26
Measles 0 1 0 5 0 0 14
Mumps 4 2 4 4 11 4 0
Pertussis (Whooping Cough) 142 280 461 81 81 142 35
Pneumococcal Disease (Invasive)¶ 17 9 7 3 3 9 0
Rubella 0 0 0 0 0 0 0
Tetanus 1 0 1 0 0 0 0
Selected Communicable Diseases
Cryptosporidiosis 27 17 8 23 23 17 2
E.coli O157:H7 10 16 18 0 8 16 2
Hepatitis A 5 6 6 20 9 6 2
Hepatitis C 852 920 868 801 948 852 257
Histoplasmosis 15 12 20 20 19 15 8
Legionnaires' Disease 39 27 51 73 69 39 5
Listeriosis 6 6 4 11 5 6 1
Lyme Disease 32 31 36 42 33 32 2
Malaria 12 19 7 15 15 15 0
Meningococcal Disease 3 3 3 0 3 3 1
Salmonellosis 356 260 308 311 314 308 50
Shigellosis 128 60 52 49 144 60 21
Streptococcal Invasive (Group A) 50 49 69 65 59 50 17
Tuberculosis  93 75 89 78 68 89 18
Typhoid Fever 6 8 2 0 3 3 2
West Nile Virus (Neuroinvasive) 15 10 61 15 10 15 0
Sexually Transmitted Infections
Chlamydia 8,825 8,403 8,820 8,977 ** ** **
Gonorrhea 2,093 2,067 2,102 2,099 ** ** **
HIV (not AIDS) 172 166 174 154 ** ** **
AIDS 78 58 86 92 ** ** **
Syphilis** 98 91 91 65 ** ** **

Except for tuberculosis, excludes Evanston, Oak Park, Skokie and Stickney Township
* Provisional cases through the first quarter of 2015
† Includes type B
¶ As of 3/08, reportable only in those < 5 years of age
§ Primary and secondary syphilis
** Due to reporting lags, data are not available