The 2017-2018 flu season was made worse by two factors: strains that hit the very young and elderly especially hard, and a poor matchup between those strains and those in the flu vaccine.
Source: Medical News
The 2017-2018 flu season was made worse by two factors: strains that hit the very young and elderly especially hard, and a poor matchup between those strains and those in the flu vaccine.
Source: Medical News