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-Q1*
Diphtheria 0 0 0 0 0 0 0
Haemophilus Influenzae 26 34 33 45 50 34 7
Hepatitis B          
  Acute 23 7 13 9 1 9 2
  Chronic 371 371 321 258 260 321 45
Measles 5 0 14 0 0 0 0
Mumps 4 12 22 39 39 22 9
Pertussis (Whooping Cough) 143 186 171 196 120 171 2
Pneumococcal Disease (Invasive)¶ 8 9 8 7 11 8 1
Rubella 0 1 0 0 0 0 0
Tetanus 0 0 0 1 0 0 0
Varicella 99 85 63 73 69 73 19
Selected Communicable Diseases
Campylobacteriosis¶¶ 308 333 48
Cryptosporidiosis 23 23 10 36 38 23 4
E.coli O157:H7 11 8 8 30 7 8 1
Hepatitis A 20 9 12 7 12 12 1
Hepatitis C 801 950 962 936 1103 950 215
Histoplasmosis 20 21 22 34 37 22 5
Legionnaires' Disease 73 69 47 69 75 69 7
Listeriosis 11 5 13 10 8 10 1
Lyme Disease 42 33 41 51 57 42 4
Malaria 15 15 13 17 12 15 1
Meningococcal Disease 0 3 1 2 2 2 0
Salmonellosis 311 314 314 313 302 313 39
Shigellosis 49 144 94 66 52 66 5
Streptococcal Invasive (Group A) 65 60 56 58 49 58 23
Tuberculosis  78 64 85 83 86 83 25
Typhoid Fever 4 3 8 8 5 5 1
West Nile Virus (Neuroinvasive) 15 10 4 24 20 15 0
Sexually Transmitted Infections
Chlamydia 8,977 9,384 9,760 10,456 ** 9,572 **
Gonorrhea 2,009 1,928 2,128 2,555 ** 2,069 **
HIV (not AIDS) 154 187 201 225 ** 194 **
AIDS 92 79 78 81 ** 80 **
Syphilis§ 65 69 146 189 ** 108 **

Except for tuberculosis, excludes Evanston, Oak Park, Skokie and Stickney Township
* Provisional cases through the first 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