Percentage of Influenza Detections at Clinical...

Laboratory surveillance for influenza, respiratory syncytial virus (RSV), and other respiratory viruses involves the use of data from clinical sentinel laboratories (hospital, academic or private) located throughout California. Specimens for testing are collected from patients in healthcare settings and do not reflect all testing for influenza, RSV, and other respiratory viruses in California. These laboratories report the number of laboratory-confirmed influenza, RSV, and other respiratory virus detections and isolations, and the total number of specimens tested by virus type on a weekly basis. Test positivity for a given week (Sunday through Saturday) is calculated by dividing the number of positive influenza results by the total number of specimens tested for influenza.