One large laboratory‐based surveillance study detected influenza viruses in 18.4%‐25.5% of samples collected from patients with ILI between 2007 and 2011.44, 73 The percentages of influenza‐positive samples that were influenza B ranged from 12.9% in 2009 to 42.9% in 2008.73 This evidence concerns the gene PPIB and influenza.