Possible E. coli contamination has prompted Rich Products Corp. of Buffalo to expand a recall to include about 3 million pounds of frozen pizza, mozzarella bites, Philly cheese steaks and other snack products.

The recall involves all products made at the company's plant in Waycross, Ga. The products have best buy dates from Jan. 1, 2013 through Sept. 29, 2014, NBCNews.com reported.

The foods may be contaminated with E. coli O121, a strain that can be just as dangerous as the better-known E. coli O157:H7, which is frequently involved in outbreaks caused by hamburger.

This latest recall expands on a March 28 recall of about 196,000 pounds of Farm Rich brand frozen chicken quesadillas and other frozen mini meals and snack items that may have been contaminated with E. coli O121, NBCNews.com reported.

So far, 24 people in 15 states have become ill after eating those products, including 7 who have been hospitalized, according to the Centers for Disease Control and Prevention.