City officials confirmed Monday that a UC Berkeley student diagnosed with measles had spent time on campus, in the community and on public transportation before being isolated.

According to a press release from the city, the community was exposed starting Aug. 24, when the student rode the AC Transit 25-A bus about 3:30 p.m. and again at 5:30 p.m. During the infectious period, before any rash developed, the student spent time on the Berkeley campus and in the surrounding community.

The student was placed in isolation Saturday. The virus can remain in the air for up to two hours, the release said, potentially exposing many Berkeley community members to the virus in multiple places around the city.

Since the student was put in isolation, Berkeley Public Health has worked with the campus to contact exposed individuals who lived with or took classes with the student. The city, with the California Department of Public Health and other public health officials, is in the process of relaying information to those who may have been exposed as well as to health care providers, the release said.

According to a statement released by campus officials Tuesday morning, the city and the campus have not identified any other measles infections related to this case.

“I encourage Berkeley community members to make sure they and their children have received the required two doses,” said city Health Officer Janet Berreman in the release. “Obtaining records of your vaccination could prove critical in the event of a local outbreak.”

The infectious virus spreads quickly, and symptoms develop usually between seven to 21 days after exposure, but those who have been vaccinated with the MMR vaccine face little risk of contracting the disease.

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Bo Kovitz is the city news editor. Contact her at bkovitz@dailycal.org and follow her on Twitter at @beau_etc.