FN1 and infection: We reasoned that higher OTU values were more likely to represent true infection and arbitrarily selected a cutoff value of 0.1 for patients with possible infection due to Fn. In 18 sore throat patients (5.3%) the OTU value for Fn was greater than or equal to 0.1; however, one of 30 controls also had an OTU value in this range (3.3%).