Abstract
Six cesarean-derived lambs were inoculated either with 4.5 X 10(4), 4.5 X 10(6) or 4.5 X 10(8) Mycoplasma mycoides subsp. mycoides intratracheally. One animal receiving the intermediate dose died four days post-inoculation, the two receiving the high dose died six days postinoculation, while one receiving the low dose died eight days postinoculation. The two surviving lambs were challenged on day 20 postinoculation with 1 X 10(8) organisms subcutaneously and 2 X 10(9) organisms intravenously. One animal died eight days following this challenge while the other survived and was killed. Six conventionally reared lambs challenged with 90 to 8500 organisms by intranasal and intraocular instillation failed to become infected. Three conventionally reared calves were each inoculated with 1 X 10(8) organisms by each of intratracheal, subcutaneous and intravenous routes. They were killed 20 days post-inoculation without having shown any clinical signs.
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