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A meta-analysis of the effect of dose and age at exposure on shedding of Mycobacterium avium subspecies paratuberculosis (MAP) in experimentally infected calves and cows
Mitchell, R. M..  Epidemiology and Infection.  v. Vol.140. no. No.2.   2012. p. 231 - 246... issn: 0950-2688 .   

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