第二年：春----幼虫蜕皮变为若虫，即蜱最具侵袭性的阶段。
YEAR 2 : Spring----Larva molts into nymph—the tick's most aggressive stage.
幼虫成长迅速并且蜕皮数次。
幼虫共有5龄，以夜晚蜕皮为主，5龄幼虫老熟后即觅地化蛹，化蛹持续时间2 - 4天。
The larvae had five instars, and exuviated at night, pupated at 5rd instar old larvae, pupation time need 2-4 days.
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