Women's Health Which Berry Is Most Likely To Be Contaminated? A Food Safety Expert Breaks It Down Amid New FDA Rules “While the overall risk of contracting a virus from frozen berries remains relatively low, the persistence of viruses like norovirus and hepatitis A in frozen conditions is concerning,” says Darin Detwiler, LPD, author of the book Food Safety: Past, Present, and Predictions and a professor at Northeastern University.