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Volume 19, Number 9—September 2013

Research

New Estimates of Incidence of Encephalitis in England

Julia Granerod1Comments to Author , Simon Cousens, Nicholas W.S. Davies1, Natasha S. Crowcroft1, and Sara L. Thomas
Author affiliations: Public Health England, London, UK (J. Granerod); London School of Hygiene and Tropical Medicine, London (S. Cousens, S.L. Thomas); Chelsea and Westminster Hospital, London (N.W.S. Davies); Public Health Ontario, Toronto, Ontario, Canada (N.S. Crowcroft)

Main Article

Table 1

Definition of numerator for encephalitis incidence estimates, England

First-ever episode* Subsequent episodes
Encephalitis code in any diagnostic field (1–20)
Subsequent encephalitis code/s represented a different etiology to that recorded for the first-ever episode; for identical codes, both were in the primary diagnostic field and the end date of the first episode and start date of the subsequent spell were >6 mo apart
Encephalitis code in primary diagnostic field only Subsequent encephalitis codes were also in the primary diagnostic field and represented a different etiology to that recorded for the first-ever episode; for identical codes, both were in the primary diagnostic field and the end date of the first spell and start date of the subsequent spell were >6 mo apart

*Refers to the first-ever episode within this dataset.

Main Article

1On behalf of the United Kingdom Public Health England Aetiology of Encephalitis Study Group (members listed at the end of this article).

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