Poliomyelitis epidemic in the Netherlands, 1978

Area of Science:

• Epidemiology
• Public Health
• Infectious Diseases

Background:

• The Netherlands experienced a polio epidemic in 1978, unusual for its widespread occurrence in areas with high vaccination rates.
• Previous outbreaks were typically confined to regions with low vaccination acceptance.

Purpose of the Study:

• To analyze the characteristics and spread of the 1978 polio epidemic in The Netherlands.
• To investigate the role of vaccination status and religious affiliation in the epidemic's transmission patterns.

Main Methods:

• Provisional data analysis of reported polio cases during the 1978 epidemic.
• Comparison of case distribution with vaccination acceptance rates across different municipalities.
• Examination of demographic and religious factors among affected individuals.

Main Results:

• The epidemic, caused by poliovirus type 1, affected 110 individuals, predominantly those unvaccinated for religious reasons.
• Cases were concentrated in a specific population group (approx. 66,000 individuals under 27) belonging to Protestant denominations rejecting vaccination.
• No polio cases were observed in unvaccinated individuals for non-religious reasons or in the generally vaccinated population (approx. 95% acceptance rate).

Conclusions:

• The 1978 polio epidemic in The Netherlands demonstrated selective spread within a cohesive, unvaccinated religious community.
• This outbreak underscores the critical role of high vaccination coverage in preventing widespread transmission, even in highly vaccinated populations.
• Religious objections to vaccination pose a significant public health challenge, necessitating targeted community engagement.