Active Laboratory Surveillance

The Health Department actively solicits data on influenza and respiratory syncytial virus (RSV) test results from NYC laboratory facilities that are licensed to perform such testing, and from selected clinicians in the community who collect samples from patients with influenza-like illness.

During Week 44 (October 29 – November 4) of 2017, about 1.4% of all specimens submitted for influenza testing were positive for influenza, of which 28 specimens were positive for influenza A and 11 specimens were positive for influenza B. In addition, approximately 7% of specimens submitted for respiratory syncytial virus (RSV) testing were positive.