Atlanta, Ga. ? Most Americans know about a peanut-based national salmonella outbreak but many are wrong about what products are involved and few have confidence in food safeguards, according to a Harvard survey released Friday.

About 1 in 4 of those polled mistakenly think that national peanut butter brands are involved in the product recalls, but fewer than half are worrying about recalled snack bars, baked goods, ice cream and dry-roasted peanuts.

The recall of 1,900 products includes mainly minor-label peanut butter and a range of other items, but not major brand names of jarred peanut butter.

“A lot of people have taken some precautions but they’re not looking at the ingredients in products not related to peanut butter,” said Robert Blendon, the Harvard health policy professor who directed the survey.

About 93 percent know about the outbreak and recall, and most of them understood it was caused by salmonella bacteria — an unusually high level of awareness for a public health issue, Blendon noted.

The poll also indicated little faith in corporations and the government. Only 1 in 3 Americans said they have a good or great amount of confidence in food manufacturers or government inspectors to keep food safe, the survey found.