In a study reported by Reuters on April 2012 and published in the Clinical Infectious Diseases journal, Dr. David Witt and other researchers looked at 132 patients at the Kaiser Permanente Medical Center in San Rafael, CA who tested positive for whooping cough during March-October 2010. Get this… 81% of the patients were fully up to date on the pertussis vaccine, 11% had received at least one round of the vaccine, and only 8% had never been vaccinated. 107 for 132. Hey, not bad. What bunk.