Hepatitis A virus infections, immunisations and demographic determinants in children and adolescents, Germany

Area of Science:

• Epidemiology
• Vaccinology
• Public Health

Background:

• Hepatitis A is a vaccine-preventable disease with global impact.
• Children play a key role in Hepatitis A virus (HAV) transmission.
• Understanding HAV epidemiology in children is crucial for public health strategies.

Purpose of the Study:

• To investigate HAV infections, immunizations, and demographic factors in German children and adolescents.
• To identify risk factors for HAV infection in the pediatric population.
• To inform vaccination recommendations for children in Germany.

Main Methods:

• Nationwide, population-based, cross-sectional survey conducted in Germany (2003-2006).
• Analysis of 12,249 children and adolescents aged 3-17 years with complete data sets (HAV serology, demographics, vaccination status).
• Multivariate logistic regression to identify demographic determinants of HAV infection.

Main Results:

• Protective HAV antibody levels (>=20 IU/L) were found in 14% of individuals.
• 11% of participants were vaccinated against Hepatitis A, and 3% had prior HAV infection.
• Antibody prevalence increased significantly with age.
• Children and adolescents with a migration background, even if born in Germany, were disproportionately affected by HAV infections.

Conclusions:

• HAV infection and vaccination prevalence increase with age in German children.
• Children with a migration background represent a high-risk group for HAV infection.
• Existing vaccination recommendations should be reinforced, and targeted vaccination for high-risk groups, particularly children with a migration background, should be considered.