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- meán-aga báis Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
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- meán-am báis Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
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- mean death time | MDT
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- Definition mean time in hours for the minimum lethal dose of a particular pathogen to kill all the inoculated embryos Reference "OIE (2004), OIE Manual of Diagnostic Tests and Vaccines for Terrestrial Animals 2004, Chapter 2.1.15 'Newcastle Disease', http://www.cfsph.iastate.edu/HPAI/resources/Additional%20Resources/OIEManual2_1_15.pdf [13.6.2012]"
- Comment Used to classify virus strains: for example, in the case of Newcastle disease, virus strains are classified on the basis of MDT as velogenic (taking under 60 hours to kill), mesogenic (taking between 60 and 90 hours to kill) and lentogenic (taking more than 90 hours to kill).