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Effects of administration of 6918VP60-T2 virus after 10 passages in vivo. Groups of eight rabbits were inoculated by s.c. route with Passage 0 (■) or Passage 10 (▴) 6918VP60-T2 virus. Rabbits were observed daily for a period of 18 days and the clinical signs due to virus infection of each animal were ranked from 0 to 6 according to Table 1.
