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The development of DIVA system (differentiating infected from vaccinated animals) is currently an important focus of research due to trade and political issues.
The development of DIVA system (differentiating infected from vaccinated animals) is currently an important focus of research due to trade and political issues.
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[http://www.oie.int/en/animal-health-in-the-world/web-portal-on-avian-influenza/ OIE Avian Influenza] accessed June 23, 2013
[http://www.oie.int/en/animal-health-in-the-world/web-portal-on-avian-influenza/ OIE Avian Influenza] accessed June 23, 2013