we bring in stephanie chung who joins us in san francisco where a source has been narrowed down to a cafe in inside of in order some. >> it's inside the stones storm in order storm. only 3 to 400 cases of the typhoid fever in the u.s. each year but this is the first time that the typhoid fever has been linked to a food handler. the number one way of contamination is food and drink and that's the way typhoid fever is passed on. a line cook at the nordstrom cafe has typhoid fever. >> it is not highly transmissable but it can be transmitted through food that's been touched by someone who has had an infection if contaminated. the doctor says the cook likely got infected after his recent trip outside the country. symptoms show up one to three weeks after infection ranging from fever to stomach pain, headaches, nausea and loss of appetite. >> the majority of people do not progress to very serious illness although some people can become very sick out treatment. >> anyone who at it there april 16, 20 and, 20th through the 27th is at risk. >> if people are really sick, there ou there shouldn'