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Volume 10, Number 5—May 2004

Research

Ring Vaccination and Smallpox Control

Mirjam Kretzschmar*Comments to Author , Susan van den Hof*, Jacco Wallinga*, and Jan van Wijngaarden†
Author affiliations: *National Institute of Public Health and the Environment (RIVM), Bilthoven, the Netherlands; †Inspectorate of Health Care, the Hague, the Netherlands

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Figure 2

The time course of events in the process of transmission and intervention. The success of intervention is essentially determined by the time between start of the infectious period and diagnosis of the index case, and the time between the start of contact tracing and the vaccination of the contact.

Figure 2. The time course of events in the process of transmission and intervention. The success of intervention is essentially determined by the time between start of the infectious period and diagnosis of the index case, and the time between the start of contact tracing and the vaccination of the contact.

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