Take it from someone who has experienced a bout with salmonella...you don't want to take any chances with this monster.
Refraining from eating a product until it is cleared by the powers that be certainly trumps finding yourself laying on the bathroom floor praying to die just so you can feel better.
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Or, you can get the tomatoes from a reliable, locally-grown source.
Robert, let's say the salmonella bacteria is on the outside of the tomato, due to unsanitary hands picking the tomatoes. The tomato contaminates other tomatoes and everything with which the tomatoes comes into contact. The tomatoes hit the blade of the knife as they are being chopped, and the salmonella is now on the inner parts of the tomato, and possibly every tomato cut by that knife or blades.