Influenza-like Illness Incidence Is Not Reduced by Influenza Vaccination Influenza vaccination reduces the number of influenza virus infections but not the overall number of illness.
Alertness about the Zika virus still needed for pregnant women Since May 2015, there has been a Zika virus outbreak in South and Central America, including the Caribbean. The Zika virus can cause birth defects, including microcephaly (small head size).