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Whooping cough remains a life-threatening infection, especially for unvaccinated young children. The article describes a case of severe and non-smooth course of whooping cough in an unvaccinated girl of 4 months of life from the family hearth of whooping cough and COVID-19. There were cases of COVID-19 and whooping cough in adults in the family, occurring under the mask of a mild respiratory infection, not verified before they were detected in a child and did not require hospitalization. The combined course of two infectious diseases COVID-19 and whooping cough in a 4-monthold unvaccinated girl contributed to the prolongation of the duration of whooping cough, prolonged release of SARS-COV-2 RNA, the late appearance of hematological changes typical of whooping cough, the development of respiratory delays and re-hospitalization of a patient with prolonged respiratory support. In the context of the COVID-19 pandemic, the coverage of routine vaccination has significantly decreased, as a result of which children of the first years of life have become more vulnerable to vaccine-controlled infections, which causes the risk of combined infections.

A case of whooping cough in a moderate form in a child of the first month of life is described in the presented clinical observation. The moderate form was manifested by the duration of the preconvulsive period up to 5 days, the appearance of cyanosis of the face when coughing in the early stages of the disease (1 week), an increase in the number of coughing attacks. The difficulties of treating pertussis in young children are demonstrated by our observation of the course of the disease. There is no vaccination against pertussis in children in the family due to the refusal of parents and children with prolonged coughing were not examined at the outpatient stage. As a result, chemoprophylaxis was not performed on time and the newborn was discharged from the hospital to the center of pertussis infection. The solution to the problem of reducing the incidence in children in the first months of life should be vaccination of pregnant women in the last stages, and vaccination of the environment, including agerelated revaccinations.