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United States Department of Agriculture

Agricultural Research Service

Research Project: PATHOTYPE ANALYSIS OF AVIAN INFLUENZA VACCINE CANDIDATE VIRUSES

Location: Exotic and Emerging Avian Viral Diseases Research Unit

Project Number: 6612-32000-063-05
Project Type: Reimbursable

Start Date: Oct 15, 2009
End Date: Oct 14, 2013

Objective:
To assess the pathogenicity and infectivity of influenza vaccine reassortants and their respective parental wild type viruses for chickens. This includes: 1) determining in vivo pathotype of wild type and reassortant vaccine candidate strains in chickens, and 2) assess in vivo infectivity and pathogenicity in chickens using simulated natural route of exposure (intranasal).

Approach:
The challenge studies will be conducted in BSL-3 Enhanced facilities. Four vaccine candidates will be tested per year using the below study design: 1) conducting in vivo pathotype of virus strains by intravenous testing in chickens using intravenous pathogenicity index, and 2) conducting in vivo infectivity and pathogenicity testing by intranasal inoculation of chickens and determining the ability for the virus to grow as evident by virus shedding for oropharynx and cloaca, and ability to cause disease by assessing clinical features, serological reaction and histopathological changes to various organs.

Last Modified: 4/15/2014
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