[Lessons learnt from the German smallpox outbreaks after World War II].

Area of Science:

• Epidemiology
• Infectious Disease Control
• Public Health Preparedness

Background:

• Smallpox (variola virus) eradication by WHO in 1980 does not eliminate bioterrorism risks.
• Potential threats include undeclared virus stocks or recombinant poxviruses.
• Modern populations have reduced immunity, increasing vulnerability.

Purpose of the Study:

• To analyze historical smallpox outbreaks in Germany for modern preparedness.
• To gather epidemiological data for outbreak response and counter-bioterrorism planning.
• To assess the impact of vaccination and identify transmission patterns.

Main Methods:

• Hand search of full-text articles from 1945-1975 in major German public health journals.
• Focus on contagiousness, vaccination/revaccination effects, and infection sources.
• Analysis of 12 documented smallpox outbreaks.

Main Results:

• 12 outbreaks resulted in 95 cases and 10 deaths.
• 81 vaccinated individuals contracted smallpox, but 91% experienced mild symptoms.
• Mildly symptomatic vaccinated individuals posed a high transmission risk due to misdiagnosis and continued contact.
• Low transmission risk in the initial 2-3 days of symptoms aided control.
• Hospitals were significant sites of infection, emphasizing their preparedness.

Conclusions:

• Historical smallpox data offers crucial insights for current outbreak response.
• Findings are vital for bioterrorism preparedness and counter-terrorism strategies.
• Understanding transmission dynamics and vaccination impact informs public health interventions.