Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 372887
Title Within-Flock Mortality During the High-Pathogenicity Avian Influenza (H7N7) Epidemic in the Netherlands in 2003: Implications for an Early Detection System
Author(s) Elbers, A.R.W.; Holtslag, J.B.; Bouma, A.; Koch, G.
Source Avian Diseases 51 (2007)s1. - ISSN 0005-2086 - p. 304 - 308.
Department(s) CIDC - Division Virology
Publication type Refereed Article in a scientific journal
Publication year 2007
Keyword(s) virus - outbreak - turkeys - california - chickens - h6n2
Abstract Daily within-flock mortality data, from a few days before until a few days after onset of increased mortality, from H7N7-infected flocks were analyzed with nonlinear regression for layer (organic and free-range or caged), broiler, and turkey flocks. The following notification thresholds were recommended for the Netherlands: 1) organic layer flocks, broiler flocks, and turkey flocks 11 wk of age: 0.5% mortality/day for two consecutive days; 2) layer flocks with birds housed in cages: 0.25% mortality/day for two consecutive days; 3) turkey flocks 16 wk of age: 1% mortality/day for two consecutive days. Notification of increased mortality to the veterinary authorities should take place on the second day of increased mortality. Interpretation of mortality thresholds should be on the level of the poultry barn in which clinical problems arise. Because of nonoptimal specificity of proposed thresholds (mortality possibly caused by other diseases), use of PCR-diagnostics (results within 24 hr) without costs to the individual farmer should be promoted to exclude avian influenza in suspect clinical situations in order to minimize negative economic consequence for farmers and stimulate notification by farmers and veterinary practitioners
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