The FDA announced there are multi-state outbreaks of salmonellosis reported to be from the consumption of raw, red tomatoes. If you have any doubts or concerns regarding already purchased tomatoes, contact your retailer. (Personally, I'd throw them out.)
At this point, it's easier to describe what tomatoes are considered safe.
The FDA reports 145 cases of salmonellosis (Salmonella Serotype Saintpaul) including some hospitalized.
Check your tomatoes!