Flu Scan for Dec 06, 2017- Waning flu vaccine effect; Maternal flu vaccine protection

A new meta-analysis of 14 studies shows that vaccine effectiveness (VE) against influenza A H3N2 drops 33% within 6 months of immunization, while VE against influenza B declines by 19%. A small VE decline against influenza A H1N1 was not statistically significant. A study in the Journal of Infectious Diseases shows that prenatal maternal flu vaccination was associated with good protection against flu in infants.