http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Acellular pertussis vaccine effectiveness over time
Compared to fully DTaP vaccinated children, unvaccinated and undervaccinated children were at greater risk of pertussis. However, most pertussis cases occurred among age-appropriately vaccinated children.
Acellular Pertussis Vaccine Effectiveness Over Time (3:17);
Title from resource description page (viewed July 16, 2021).