at the county health department nurse diane kerr contacted everyone who fell ill and discovered theyll eaten a salad from one of ten local restaurants. >> most of the people seemed to have eaten potato salad. at another restaurant most of the people seemed to have eaten a green salad. and so what was going on? >> they looked at common suppliers of food. they looked, you know, where did everybody get their lettuce? where did everybody get this? where did everybody get that? >> we couldn't find one source of cucumbers or lettuce or of meat or of anything that would explain all those restaurants being contaminated at once. >> dr. michael skeels runs the laboratory that processed samples from the dalles salmonella outbreak. microbiologists discovered that all of the victims had the same strain of salmonella, one that was exceptionally rare. >> it was dulcitol negative, which means it didn't biochemically break down a sugar called dulcitol. and that's only the case for 2% of salmonellas of this type. >> this salmonella had another odd characteristic. unlike most bacteria, this one was not

kerr taking over for mark jackson. >> thanks for joining us for abc7 news at 4:00 >> world news is diane sawyer is next. >>> welcome toews." tonight on fire inside the neighborhood set ablaze after the military jet crash. the families describing the horror after several homes go up in flames. >>> the manhunt underway at this hour. families barricading themselves inside as they take pictures of the gunman firing outside their window. authorities say he's heavily armed. our correspondent on the scene. >>> no apologies. what president obama said today about that soldier saved from the taliban and that tape, what the pictures reveal from the tapping of his arm to what he's wearing and what it says about the soldier and his captors. >>> come on down. remember the price is right contestant getting workers' comp even though she could spin the wheel? tonight who did authorities fi