Generate an explanation for the given claim using the provided supporting material from the paragraph. Please consider the following points while generating an output. 1) The claim will always have supporting proof in the paragraph, and the paragraph will have a clear point of view supporting the claim. 2) There can be instances where direct correlation to the claim is not available. Make use of the sentences in the paragraph to provide a corresponding output supporting the claim. 3) The explanation should be at least one and at most twelve sentences long.

Paragraph: Clark County Public Health says people who visited PeaceHealth Urgent Care - Memorial in Vancouver in the afternoon Dec. 31 may have been exposed. The Oregon Health Authority said a measles case was confirmed in a person who spent time in The Dalles and Hood River. People in The Dalles may have been exposed Dec. 29 at the Discovery Center or Dec. 31 at Fred Meyer. People in Hood River may have been exposed Dec. 30 if they were at Doppio Cafe, Goodwill or Full Sail Brewery in the early afternoon. People who were at the Oregon Health & Science University Emergency Department Jan. 2 in the morning may have been exposed. Officials advise anyone who may have measles symptoms to call before visiting a medical office. Measles symptoms begin with a fever, cough, runny nose and red eyes, followed by a rash. Claim: Measles cases confirmed in Vancouver and Portland.
Authorities in Vancouver, Washington, have confirmed a case of measles in a child while the Oregon Health Authority has confirmed a separate measles case in Portland, Oregon.