- Confirmed Case: An acute illness with maculo-papulovesicular rash and epidemiologic link to another confirmed case or laboratory confirmation. Unvaccinated person with 200-400 lesions.
- Probable Case: An acute illness with maculo-papulovesicular rash and lack of epidemiologic link to another confirmed or probable case or lack of laboratory confirmation.
- Breakthrough Case: Vaccinated cases that are milder, less contagious, have lower fever and fewer lesions (<50). Lesions are often maculopapular instead of vesicular. Atypical appearance often leads to misdiagnosis. Consider laboratory confirmation given atypical appearance.
Please see the Varicella Clinical Guidelines for important information about varicella, including information on testing and specimen requirements.
For more information about collecting specimens click here.
Suspect Cases should be reported within 24 hours.
Do not wait for laboratory confirmation.
Complete the : CDPH Case Report Form
Fax Form To: (312) 746-6388
Questions: (312) 746-9867
Sign up for electronic reporting through the
- Provide education and technical assistance to providers
- Conduct public health investigation on all positive cases by confirming patient diagnosis; ensure appropriate medical follow-up; locate persons who may have been exposed; and provide education on post-exposure prophylaxis.
- Implement control measures for outbreaks
- Provide training, education and access to the Illinois National Disease Surveillance System
- Ensure provider reporting is completed on all chicken pox cases
For Clinical Questions Contact:
Dr. Marielle Fricchione, Medical Director
For Program Questions Contact:
Erika Davis, Varicella Coordinator
For questions during non-business hours call 311.
(312-744-5000 if outside the City of Chicago.)
- Rash generally appears first on the head and is most concentrated on the trunk.
- Those who have not been vaccinated with varicella vaccine will have a generalized rash that is pruritic and progresses rapidly from macules to papules to vesicular lesions before crusting.
- Lesions are usually 1 to 4mm in diameter.
- Healthy children will usually have 200 to 500 lesions in 2 to 4 successive crops.
Breakthrough varicella is defined as a case of varicella due to infection with wild-type VZV occurring more than 42 days after varicella vaccination.
HERPES ZOSTER VIRUS (SHINGLES):
Characterized by vesicular lesions in one dermatome. Many labs automatically report + VZV PCRs to the health department. Talk to your lab about filtering out shingles results so they are not reported to CDPH.
Shingles is not a reportable disease