Last year, salmonella cases fell 9 percent, compared to the previous three years. The Centers for Disease Control and Prevention says that’s the largest drop in a decade.

But officials were cautious about making too much of it. Last year was compared to a time period that included a large salmonella outbreak tied to eggs.

Overall, there wasn’t much change. The CDC report found no significant change in most kinds of food poisoning. There was a spike in illnesses caused by a bacteria found in raw shellfish like oysters, but the number of cases was still relatively small.

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Online:

CDC report: http://www.cdc.gov/mmwr