Elk Grove Village, IL—(ENEWSPF)—September 30, 2013. In 2010, 9,120 cases of pertussis – or whooping cough – were reported in California, the most since 1947. Several causes of the outbreak have been documented, including waning immunity of the acellular pertussis vaccine. A new study in the October 2013 Pediatrics examines the role of clusters of individuals who refused the vaccine.
