This is very much UNTRUE. These days, whether a cheese is pasteurised or not makes very little difference. It is the moulds within different types of cheese which actually pose a small threat as they can carry listeria. Listeria in small quantities will not pose a threat normally to the consumer, but can unfortunately result in complications and even still birth in pregnant women. Therefore, it is recommended to avoid all soft cheese, blue cheese and rind-washed cheeses (those with a pinky orange rind) as it is these that contain the moulds which can conceivably contain low levels of listeria. Hard cheeses are fine, such as cheddar and Parmesan.