PORTLAND A Portland TriMet bus driver was diagnosed with whooping cough after working a 3-and-a-half hour shift, according to a TriMet spokeswoman.

KGW s news partner, The Oregonian, first reported Wednesday morning that Twitter user @DailyCyclist took a picture of the condoned off bus sealed in caution tape with a sign reading Do not enter, infected bus.

On Wednesday, KGW learned the driver was on the 10 route from 5:30 a.m. to 9 a.m., but the agency did not specify the day.

The 10-Harold Street bus line travels through inner Southeast Portland from the Lents Town Center to downtown.

Anyone who thinks they may be experiencing whooping cough symptoms should contact their health provider or call Multnomah County Health at 503-988-3406.

TriMet released information about the possible exposure just after noon Wednesday, more than 20 hours after pictures of the cordoned-off bus first emerged on social media. The agency did not say how many people were possibly exposed.

Whooping cough, or pertussis, is a bacterial infection that spreads through the air. The symptoms include coughing or sneezing that starts like a cold but gets worse over developing weeks.

According to the Centers for Disease Control, whooping cough is very contagious and severe for babies.

More: Protecting your family from whooping cough

The bus that was possibly exposed was sanitized and returned to service, according to Angie Murphy with TriMet. Murphy said the agency would not comment any further about the incident.

Sign warning people of #Trimet whooping cough bus. Daily Cyclist (@DailyCyclist) November 5, 2013
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