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Lyme disease is caused by a bacterium transmitted to people by deer ticks. Deer ticks are almost never born infected with the bacterium, but they can pick it up from feeding on an infected host in any of the tick's three successive stages of development: larva, nymph, adult. Once infected, a tick remains infected through any subsequent developmental stages, but since a tick feeds on only one host in each stage, it follows that __________.
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people can be infected only by being bitten by a tick that is either in the larval stage or in the nymph stage
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people cannot be infected by a tick that picked up the Lyme disease bacterium in the adult stage
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it is not possible for a person to be infected by a tick that is in the nymph stage or by a tick that was infected with the bacterium while in the nymph stage
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people infected with the Lyme disease bacterium cannot transmit the bacterium to adult deer ticks
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only deer ticks that are adults can transmit the Lyme disease bacterium to people
b说不会被成虫感染，c说不会被幼虫感染，但怎么判断什么时候寄生到人身上？？
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发表于 2018-11-25 14:05:57
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