Public health laboratories tested 98,446 specimens during October 1, 2017–53,790 (54.6%) were positive for influenza viruses, including 38,303 (71.2%) positive for influenza A and 15,487 (28.8%) for influenza B (Supplementary Figure 2, ). Regionally, § the week of peak clinical laboratory influenza positivity varied, ranging from the week ending December 30 (week 52) to the week ending February 17 (week 7). ![]() Nationally, the percentage of clinical laboratory–tested specimens positive for influenza virus peaked for 5 consecutive weeks during January 13–February 10 (surveillance weeks 2–6) (range = 26.1%–26.9%). During October 1, 2017–May 19, 2018, clinical laboratories tested 1,210,053 specimens for influenza virus 224,113 (18.5%) tested positive (Supplementary Figure 1, ), including 151,413 (67.6%) for influenza A and 72,700 (32.4%) for influenza B. ![]() World Health Organization (WHO) Collaborating Laboratories and the National Respiratory and Enteric Virus Surveillance System (NREVSS). ![]() CDC receives influenza test results from public health and clinical laboratories located in all 50 states, Puerto Rico, and the District of Columbia through U.S.
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