A produce department worker who tested positive for hepatitis A prompted the Denver-area Tri-County Health Department to issue an advisory and recall of more than 3,000 items.

The health department is encouraging consumers who ate green onions, cut celery, bulk lettuce or fresh-cut watermelon, honeydew or cantaloupe from the Littleton, Colo., Albertsons between April 6 and April 21 to get a hepatitis A shot.

Albertsons employee sets off health advisory

It is too soon to tell if there will be any illnesses reported, said Richard Vogt, executive director of the health department.

The incubation for hepatitis A is anywhere from a month to 50 days.

"We may or may not find cases that are actually occurring," he said. "Our hope is that we won't find any because we think that the preventative measures that have been put in place will be effective."

Vogt said he believes the risk to the public is low because the employee followed good hygiene practices and wore gloves, but the health department decided to offer shots to prevent illness to anyone who may have been exposed.