dr. george hahn. what is shigella? >> it is caused by a bacteria. it infects you when you eat it. you have little bacteria that gets into the food or someone is preparing food and you eat it and after six or 12 hours you will get cramps, diarrhea, fever, perhaps blood in the diarrhea, and vomiting. >> very serious symptoms, the the recommendation is what? >> if you have the symptoms see your doctor. get tested. possibly get treated. >> get evaluated. >> thank you, doctor, we appreciate your time. my colleague will follow-up on had story and bring you more details coming up later abc7 news. >>> thank you, matt. engineers will inspect the overpass that partly collapsed in oakland. a driver whose scar was -- whose car was smashed is speaking to us. amy hollyfield? >> yes, he worked here in emeryville. we just interviewed him. he said even though this happened to him last night, he is still upset this morning. >> it is pregnancy sure -- it is pretty surreal. i was terrified that the overpass was coming down on me. >> he was driving home from work last nature and part of the overpass s

dr. george hahn says we may never know. >> it's likely we will never be able to pinpoint the exact causeor the source of the back tear yachl >> reporter: that's common for the majority of public health problems of shigella. >> we know it came from the restaurant on these two days of >> reporter: most likely an infected employee didn't wash their hand, contaminated the food, and tested negative after not contracting the disease. the same goes for 22 people who contracted the disease and work with the public. for now the restaurant remains closed. >>> san francisco is teaming up with a major cosmetics company in an effort to eliminate hiv and aids in the city. an outreach program they're called getting to zero. that refers to zero new infections by 2020 and 0 aids deaths. mack says the approach to stopping aids is not so different than selling lipstick. >> we spent a lifetime in the cosmetic company thinking why people walk into our store and walk out. and you've all done the sakt same thing. how do we keep them in treatment in the protective store? >> there were a record low number of hiv