A Dec. 4, 2009 photo provided by the Center for Disease Control shows an African dwarf tree frog. Centers for Disease Control and Prevention officials on Wednesday, July 20, 2011 said Blue Lobster Farms, a California company, in June had resumed shipping African dwarf frogs from its Madera County, California, breeding facility. The company had voluntarily stopped shipping the frogs in April, after an investigation found them to be the source of a salmonella outbreak that sickened about 240 people nationwide over two years. CDC officials believe the frogs may still pose a serious health risk. (AP Photo/Center for Disease Control)

(AP) -- A California company has resumed selling a kind of pet frog that caused salmonella illnesses in more than 240 people, most of them children. And federal health officials are not happy.

Centers for Disease Control and Prevention officials on Wednesday warned consumers that Blue Lobster Farms in June had resumed shipping African dwarf frogs from its Madera County, California, breeding facility. They say the frogs may still pose a serious health risk.

The company voluntarily stopped shipping the frogs in April, after an investigation fingered them as the source of a salmonella outbreak that sickened people nationwide over two years. No one died, but many illnesses were in children under 5 years old - some hospitalized.

Company officials could not be reached for comment.

Explore further Egg recall tied to salmonella grows to 380 million

©2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.