Lyme Disease Female tick Uninfected six-legged larva lays eggs hatches from egg and develops ⑦Adults feed on deer and mate ②Larva feeds on small animal, becoming Year 1-Spring infected Fall and Winter Summer ⑥Nymph develops into adult tick Summer Fall and Winter Male Female Year 2-Spring Nymph feeds on animal or human, ③Larva is transmitting infection dormant ④Larva develops into eight-legged nymph (a)The tick,Ixodes scapularis,has a two-year life cycle in which it requires three blood meals. The tick is infected by its first blood meal,and can pass on the infection to a human in its second. Figure 23.13aLyme Disease Figure 23.13a