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Krishan k jakhad
A . pathogen A will be most virulent. Two important indicators of virulence are the median infectious dose (ID50) and the median lethal dose (LD50), both of which are typically determined experimentally using animal models. The ID50 is the number of pathogen cells or virions required to cause active infection in 50% of inoculated animals. so answer will be Pathogen A...Of which only 50 particles are required for active infection in 50% of inoculated organisms.