| pertussis resurgence among vaccinated children in khairpur, sindh, pakistan. | to investigate the aetiology of persistent cough among vaccinated children as suspected cases of pertussis in khairpur district, sindh, pakistan. pertussis or whooping cough, caused by bordetella pertussis, is re-appearing in many countries despite vaccination coverage. in khairpur, persistent cough and symptoms similar to pertussis among vaccinated children are common but the aetiology has not been investigated previously. | 2012 | 22445714 |