That makes three South Bay locations now where people were possible exposed to measles. The man had gone to a Walmart and to a Costco in Gilroy a day earlier.
Customers who were inside the Costco in Gilroy on January 18 between 4 p.m. and 6 p.m. may have been exposed to measles. Signs warn customers to look for symptoms -- including fever, cough, runny nose, rash -- for 21 days.
Jim and Jody Marshall were taking their grandson Brian to Dave & Buster's to play video games.
"I'm from the older generation," said Judy, "So we all had measles when we were kids. So I don't know if the strain is worse or better or what. I'm not overly concerned about it."
Brian added, "Yeah, it kind of bothers me. I'm still worried about my school."
VIDEO: Bay Area school district take measures to tackle measles
ABC News Health Editor Dr. Richard Besser says the risk of exposure is a relatively short, two-hour window.
Public health records indicate most children in the Gilroy area of kindergarten age have been vaccinated. Three of nine schools indicated 100 percent. The lowest was 96 percent.
But some born after 1957 who got vaccinated may have little or no immunity. The early vaccine contained the dead virus. Later doses had live viruses.
"There are some who were vaccinated with the first vaccines who might not be fully protected, and they should probably go check with their provider and see if another dose might be indicated," said county health officer Sara Cody, MD.
A blood test can determine if a person still has immunity.
For full coverage on the measles outbreak, click here.