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.
Q: Paragraph: The Centers for Disease Control and Prevention had issued warnings for travelers who passed through Denver International Airport or Los Angeles International Airport on Dec. 11. Colorado's Tri-County Health Department told KCNC-TV that the incubation period expired Friday. The department's Dr. Bernadette Albanese says authorities detected a secondary case of measles affecting a passenger on the international flight. She says that individual lives outside Colorado and that Tri-State had no additional information. In Colorado, Tri-County notified 258 people who were at Children's Hospital Colorado on Dec. 12 while the infected children were being treated there. No new cases were reported. The children who contracted the highly contagious disease did not have the measles, mumps and rubella vaccine. Measles symptoms include high fever, cough, runny nose, watery eyes and a rash. The illness can lead to pneumonia and swelling of the brain. Claim: Incubation period ends for possible Denver measles exposure.
A:
Health officials say an incubation period has expired for people who may have been exposed to three children infected with measles and had traveled from New Zealand to Los Angeles and to Denver last month.