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Related Experiment Videos

Colonization with potentially pathogenic respiratory tract bacteria. A household study.

A Schwan1, M Eriksson, B M Eriksson

  • 1Department of Family Medicine, Uppsala University, Sweden.

Scandinavian Journal of Primary Health Care
|December 1, 1989
PubMed
Summary

Respiratory pathogens are common in children and adults, especially those with infections. Young children and adults living with them show higher colonization rates, with Branhamella catarrhalis being most frequent.

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Public Health

Background:

  • Upper respiratory tract infections (URTIs) are common, with varying rates of pathogen colonization.
  • Understanding pathogen carriage in different age groups and living situations is crucial for infection control.

Purpose of the Study:

  • To investigate the prevalence of respiratory pathogens in the nasopharynx and throat of individuals across different age groups.
  • To determine the association between URTI symptoms and pathogen carriage.
  • To identify risk factors for pathogen colonization, such as age and household contact.

Main Methods:

  • A cohort of 235 individuals (180 adults, 55 children aged 0-15) participated over two three-month periods.
  • Daily symptom recording for upper respiratory tract infections.

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  • Nasopharyngeal and throat cultures were performed once per period.

    • Main Results:

    • 15% of asymptomatic subjects, 28% of those with minor URTIs, and 46% with severe URTIs harbored pathogens.
    • 58% of children up to seven years old were colonized with potential respiratory pathogens.
    • Adults living with young children had significantly higher colonization rates than other adults.
    • Branhamella catarrhalis was the most frequently identified pathogen.

    Conclusions:

    • Nasopharyngeal colonization with respiratory pathogens is prevalent, particularly in young children and their close contacts.
    • The presence and severity of URTI symptoms correlate with pathogen carriage.
    • Findings highlight the importance of considering colonization rates in young children when interpreting culture results and inform public health strategies for URTI prevention.