To start with, the 2018-19 seasons has been dominated by H1N1 (except in the southeast, where H3N2 has dominated once again). Although a lot of people have negative associations with H1N1 from 2009, it's actually the less virulent strain. We're better at making vaccines against it than other strains, and if you do catch the virus, you're likely to have a less severe bout. This year's vaccine is also more effective, coming in so far at around 47 percent efficacy. Plus, more people have gotten their shots. By November, the CDC reported that 44.9 percent of adults had been vaccinated, along with 45.6 percent of kids. Both of those are increases of more than six percentage points from last year.