Shoppers have been told not to eat any of the potentially contaminated products as health authorities warn that the cheese may have been sold in more than 30 countries

So far, there have been no reports of illness associated with the affected products. Listeria monocytogenes is an organism that can cause serious and sometimes fatal infections in young children, adults aged 65 or older, and others with weakened immune systems, according to the U.S. Centers for Disease Control and Prevention (CDC).