[Pertussis: recurrent threat].
Disturbing increase of pertussis diseases in Poland in the last twelve years has been observed also in Białystok district and in Białystok City. Incidence rates exceed an average of morbidity in Poland. Most of illnesses are registered at children between 5 to 9 years old, completely immunized against this disease. There were more females than males. The most of patients needed hospitalization.
Adolescent↗