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The Delaware Division of Public Health (DPH) is alerting the Delaware medical community about cases of Bordetella pertussis (whooping cough) identified among residents of Kent County Delaware.
Since October, we have received sporadic reports of Pertussis in the Amish community, primarily in Western Kent County. Late last week, DPH received multiple reports of suspect Pertussis among the Amish community. Several specimens were collected and 4 cases have been confirmed thus far by PCR.
The symptoms can be divided into three stages:
The incubation period is between 4 to 21 days, usually 7 to 10 days.
Primarily by direct contact with discharges from respiratory mucous membranes of infected persons by the airborne route, probably by droplets. The disease is frequently brought home by an older sibling and sometimes by a parent.
The communicable stage extends from the early catarrhal stage to 3 weeks after onset of typical paroxysms in patients not treated with antibiotics. When treated with erythromycin, the period of infectiousness usually is 5 days or less after onset of therapy.
The diagnosis of pertussis is usually based upon a characteristic history and physical examination. However, laboratory diagnosis may be useful in young infants, atypical cases, and cases modified by vaccine:
There are a variety of diagnostic tests available for Pertussis. However, due to the rapid turnaround time of PCR testing, DPH is encouraging physicians that wish to test for Pertussis to collect nasopharyngeal swabs and send them to the Delaware Public Health Laboratory (DPHL) in Smyrna for PCR testing. Polymerase chain reaction (PCR) testing of nasopharyngeal swabs or aspirates has been found to be a rapid, sensitive and specific method for diagnosing pertussis.
Please call (302) 653-2870 to arrange for such testing.
Families are to call their physician to obtain treatment. Physicians are required by regulation to report confirmed or suspected pertussis to the DPH at 1-888-295-5156. In the event that cases and contacts do not have a primary care physician, please call 1-888-295-5156 for further information.
Respiratory isolation is required for known cases. Suspected cases should be removed from the presence of young children and infants, especially nonimmunized infants, until the patients have received at least 5 days of a minimum 14-day course of antibiotics. Suspected cases who do not receive antibiotics, should be isolated for 3 weeks.
Inadequately immunized household contacts less than 7 years of age should be excluded from schools, daycare centers and public gatherings for 21 days after the last exposure, or until the cases and contacts have received 5 days of a minimum 14-day course of appropriate antibiotics.
Close contacts under 7 years of age who have not received 4 DtaP/DTP doses or have not received a DtaP/DTP dose within 3 years should be given a dose as soon after exposure as possible. However, this is not always possible within the Amish community.
A 14-day course of erythromycin for household and other close contacts, regardless of immunization status and age, is recommended.
Vaccination with DTP/DTaP remains the best method of prevention of Pertussis. All household and close contacts of persons with Pertussis should be prophylaxed with antibiotics regardless of age or immunization status as mentioned above.
Please call DPH, Bureau of Epidemiology at 1-888-295-5156. The number is available during normal business hours and during non-business hours for emergencies.
You can obtain additional information about Pertussis on the Centers for Disease Control and Prevention website at: http://www.cdc.gov/doc.do/id/0900f3ec80228696