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Measles Contact Tracing in the Ridesharing Economy — Oregon, 2018

Steven Rekant, DVM, MPH

EIS Officer

Center for Surveillance, Epidemiology, and Laboratory Services

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Measles?

16-year-old female from New Zealand

Visited Oregon for a wedding

Signs and symptoms consistent with measles, but no known exposure

August

8

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Specimens were sent to the California Department of Public Health’s Viral and Rickettsial Disease Laboratory.

Results came back Friday the 10^th. She had measles.

8

10

13

August

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Measles has an attack rate of over 90% in susceptible close contacts.

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How is exposure defined?

Any time spent indoors

Within 10 meters of a patient’s location

Within 20 minutes of the patient having been there

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The patient’s infectious period ended before she left Oregon.

30

2

4

6

Rash onset

Infectious period

August

8

10

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A second patient is found

Attended the same wedding in Oregon on 8/4
Rash onset 8/18
Laboratory confirmation on 8/21
She was in Texas for most of her infectious period.

Rash onset

Infectious period

4

14

18

20

22

Texas

Oregon

August

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Each patient exposed people to measles while using ridesharing services.

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How is exposure defined?

Any time spent indoors

Within 10 meters of a patient’s location

Within 20 minutes of the patient having been there

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Our objective was to identify all people exposed to measles through ridesharing.

Anyone who drove the case

Any subsequent passenger within 20 minutes

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The patient had some information.

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“I am disconnecting this call now.”

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We hoped by going in person we could convey the urgency of this unconventional request.

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Success!