According to the CDC’s weekly Morbidity and Mortality report, flu activity remains elevated as of mid-February 2020. In the U.S., annual vaccination against seasonal influenza is recommended for all persons aged older than 6 months. Among influenza-positive participants, 37% had received the 2019–20 seasonal influenza vaccine, compared with 55% of influenza-negative participants. Overall, the adjusted VE was 45% against influenza A and B virus types combined, 50% against influenza B/Victoria, and 37% against A(H1N1)pdm09. Vaccine effectiveness was higher among children and adolescents aged 6 months–17 years and lower among adults aged 18–49 years, especially against A(H1N1)pdm09. The full article is available here: https://www.cdc.gov/mmwr/volumes/69/wr/mm6907a1.htm?s_cid=mm6907a1_w