| Summary |
Thirty-nine Piglets, aged 1 ' 2 , 3 , 4 and 8 weeks, were vaccinated with one dose of
LPCV by intranasal route, respectively. All the vaccinated piglets were challenged with ALD virulent virus by intramuscular way when they were 10 weeks of age. The result showed that only 32 piglets, 82 % (32 / 39), were refractory to the challenge, and that the intranasal vaccination of LPCV seems still can't prevent the H. C. colostralantibody interference.
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