Interim Estimates of 2018-19 Seasonal Influenza Vaccine Effectiveness -- United States, February 2019.

The article presents interim estimates on influenza vaccine effectiveness for the 2018-19 season in the U.S. as of February 2019. Topics discussed include the continuing elevation of influenza activity led by the influenza A (H1N1) pdm09 virus, the approximate 40%-60% vaccine effectiveness, and its differences in some age groups, geographic circulation of viruses, and genetic variations in virus subtypes. Also noted is vaccination's continuing status as the best method for influenza prevention.