In less than two weeks, E. coli scares have led to millions of pounds of hamburger being removed from store shelves all across the country.

The latest ground beef recall involves the Sam’s Club warehouse chain and a brand produced by Cargill under the name American Chef’s Selection Angus Beef Patties. The product is being blamed for sickening 4 Minnesota children who ate the hamburgers last month. One of them is still hospitalized.

Only last week, the Topps Meat Company expanded its recall of frozen burger patties from 332,000 pounds of product to more than 21 million pounds suspected of being contaminated with E. coli. In that case, the bacteria sickened more than a dozen people in eight states.

On Saturday, Topps officials announced the company could not recover from the massive recall, and that it was going out of business.