Over the weekend, the threat of salmonella triggered the recall of 10,000 cartons of organic eggs sold at Costco and whole cucumbers sold in 28 states.

Walmart, Wegmans and Albertsons stores have recalled cucumbers for possible contamination with salmonella. They were sold in more than half of states.

Federal regulators, which have fielded reports from 19 states, say the number of people sickened may be much higher.