English PM. Herd immunity and reproduction numbers. Vaccines in practice 2009; 2.2: 7

Vaccines in practice

Reference list

English PM. Herd immunity and reproduction numbers. Vaccines in practice 2009; 2.2: 7–9.

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http://www.hpa.org.uk/webw/HPAweb&HPAwebStandard/HPAweb_C/1195733829101?p=1204012999758 (last accessed 07/07/09)

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