Pertussis in Poland in 2023

Agnieszka Rumik1, Iwona Paradowska-Stankiewicz1

  • 1Zakład Epidemiologii Chorób Zakaźnych i Nadzoru, Narodowy Instytut Zdrowia Publicznego PZH - Państwowy Instytut Badawczy.

Insights

Pertussis cases surged in Poland in 2023, with incidence rising 150% due to waning immunity and increased social contact post-pandemic. This highlights pertussis as a continuing public health concern, especially for unvaccinated infants.

Area of Science:

  • Epidemiology
  • Public Health
  • Infectious Disease Surveillance

Background:

  • Poland observed a significant rise in pertussis (whooping cough) cases in 2023, mirroring a European trend of increased respiratory illnesses post-COVID-19.
  • Contributing factors include decreased population immunity, vaccination delays, and diagnostic challenges, particularly in adult and adolescent populations.
  • The resurgence underscores the impact of the pandemic on routine immunization programs and disease transmission dynamics.

Purpose of the Study:

  • To analyze the 2023 pertussis epidemiological landscape in Poland.
  • To compare current pertussis incidence with previous years, assessing the pandemic's influence.
  • To evaluate the vaccination status of children concerning pertussis.

Main Methods:

  • Analysis of individual pertussis case reports from the EpiBaza system at the National Institute of Public Health NIH - National Research Institute.
  • Utilization of data from annual bulletins: "Infectious diseases and poisonings in Poland" and "Vaccinations in Poland in 2023".
  • Epidemiological assessment based on registered cases and vaccination records.

Main Results:

  • A total of 922 pertussis cases were recorded in 2023, marking a 150% increase from 2022, with an incidence rate of 2.45 per 100,000 population.
  • The highest incidence was observed in young children (0-4 years) at 17.3/100,000, followed by children aged 5-9 years (7.6/100,000).
  • A significant proportion, approximately 45%, of pertussis cases occurred in individuals over 15 years of age.

Conclusions:

  • Pertussis cases more than doubled in Poland in 2023, linked to the lifting of pandemic restrictions and increased social interactions.
  • Pertussis remains a critical public health threat, with declining post-vaccination immunity facilitating transmission among adolescents and adults, posing a risk to infants.
  • The study emphasizes the need for robust vaccination strategies and surveillance to mitigate pertussis resurgence.
Abstract

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