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.

Vaccine Preventable Diseases 2013 2014 2015 2016 2017 5-yr Median 2018-Q4*
Diphtheria 0 0 0 0 0 0 0
Haemophilus Influenzae 26 34 33 45 50 34 33
Hepatitis B          
  Acute 23 7 13 9 1 9 4
  Chronic 371 371 321 258 263 321 246
Measles 5 0 14 0 0 0 1
Mumps 4 12 22 39 39 22 33
Pertussis (Whooping Cough) 143 186 171 196 120 171 27
Pneumococcal Disease (Invasive)¶ 8 9 8 7 11 8 4
Rubella 0 1 0 0 0 0 0
Tetanus 0 0 0 1 0 0 0
Varicella 99 85 63 73 69 73 76
Selected Communicable Diseases
Campylobacteriosis¶¶ 308 332 320 301
Cryptosporidiosis 23 23 10 36 38 23 50
E.coli O157:H7 11 8 8 30 8 8 7
Hepatitis A 20 9 12 7 12 12 13
Hepatitis C 801 950 962 936 1093 950 809
Histoplasmosis 20 21 22 34 36 22 16
Legionnaires' Disease 73 69 47 69 75 69 126
Listeriosis 11 5 13 10 8 10 8
Lyme Disease 42 33 41 51 56 42 27
Malaria 15 15 13 17 12 15 15
Meningococcal Disease 0 3 1 2 2 2 1
Salmonellosis 311 314 314 313 304 313 315
Shigellosis 49 144 94 66 50 66 29
Streptococcal Invasive (Group A) 65 60 56 58 49 58 74
Tuberculosis  78 64 85 83 86 83 85
Typhoid Fever 4 3 8 8 5 5 12
West Nile Virus (Neuroinvasive) 15 10 4 24 20 15 37
Sexually Transmitted Infections
Chlamydia 8,977 9,384 9,760 10,456 11,244 9,760 **
Gonorrhea 2,009 1,928 2,128 2,555 2,941 2,128 **
HIV (not AIDS) 154 187 201 225 156 187 **
AIDS 92 79 78 81 57 79 **
Syphilis§ 65 69 146 189 178 146 **

Except for tuberculosis, excludes Evanston, Oak Park, Skokie and Stickney Township
* Provisional cases through the fourth quarter of 2018
† Includes type B
¶ As of March 2008, reportable only in those < 5 years of age
¶¶ Reportable beginning April 2016
§ Primary and secondary syphilis
** Due to reporting lags, data are not available