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 1 (December 31, 2017 – January 6, 2018), about 18% of all specimens submitted for influenza testing were positive for influenza, of which 684 specimens were positive for influenza A and 320 specimens were positive for influenza B. In addition, approximately 11% of specimens submitted for respiratory syncytial virus (RSV) testing were positive.