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Disease Name: Measles

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Please review the Idaho Reportable Disease Rules (IDAPA 16.02.10) for the most up-to-date information.

Idaho Department of Health and Welfare. (2016). Investigative Guidelines. Boise, ID:  Division of Public Health.

Overview / Case Definition

Clinical description

An acute illness characterized by:

Case classification


An acute febrile rash illness† with:

  1. † Temperature does not need to reach ≥101°F/38.3°C and rash does not need to last ≥3 days.
  2. ‡ Not explained by MMR vaccination during the previous 6-45 days.
  3. § Not otherwise ruled out by other confirmatory testing or more specific measles testing in a public health laboratory.


In the absence of a more likely diagnosis, an illness that meets the clinical description with:


Daycare Facility and School

A child diagnosed with Measles must not attend a daycare facility or school as longas the disease is in a communicable form. 

In the event of a case of measles in a daycare of school, susceptible children must be excluded until adequate immunization is obtained, or the threat of further spread of the disease is contained.

A person who is diagnosed as having measles must not work in any occupation in which there is direct contact with children, as long as the disease is in a communicable form.

Health Care Facility

A person diagnosed with Measles in a health care facility must be managed under the “Guideline for Isolation Precautions in Hospitals.”


Within one working day

Reportable by Healthcare and Labs:

Reportable by Food Service Facility:

Suspect Reportable: Yes

Reporting Timeframe: Within one working day

Diagnosis / Testing

The Idaho Bureau of Laboratories (IBL) offers IgM testing (reporting and turnaround time 1 business day) upon request and prior notification, during periods of heightened measles awareness, IgG testing (within 7 business days), and RT-PCR (within 2 business days).  Call IBL at (208) 334-2235 if you have questions.

Clinical specimens (throat or nasopharyngeal swabs preferred), for virus isolation should be collected at the same time as samples taken for serologic testing. IBL has only validated testing on throat or NP swabs; if other specimens (i.e., nasopharyngeal aspirates, urine, or heparinized blood) are the only specimens available, please contact a BCDP epidemiologist to discuss testing prior to submission. Virus is more likely to be isolated when the specimens are collected within 3 days of rash onset and should not be collected if the opportunity to collect a specimen occurs more than 10 days after rash onset. Information on sample collection and preservation can be found at http://www.cdc.gov/measles/lab-tools/serology.html and http://www.cdc.gov/measles/lab-tools/rt-pcr.html


Persons who have been or may have been exposed to measles should be contacted immediately, since immunization within 72 hours of exposure may prevent measles.

See MMWR for complete recommendations. Note that a person exposed to measles may still be a candidate for vaccination or IG, especially in a high-risk exposure, even if meeting the evidence of immunity as outlined in Table 3 of the MMWR: http://www.cdc.gov/mmwr/preview/mmwrhtml/rr6204a1.htm?s_cid=rr6204a1_w

Additional Information

Idaho Department of Health and Welfare. (2016). Investigative Guidelines. Boise, ID:  Division of Public Health.

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