Lyons E T, Keyes M C
J Parasitol. 1978 Jun;64(3):454-8.
Twelve fur seal pups, which had not nursed their mothers, were used in an infectivity experiment. Pups were exposed to parasitic 3rd-stage larvae of Uncinaria lucasi from belly tissues of fur seal bulls, bachelors, and pregnant cows, to determine maturation capability of the larvae. Hookworms were not recovered from the intestines of 3 pups receiving larvae from belly blubber of bulls, 6 pups receiving larvae from belly blubber of bachelors, and 1 nonexposed pup. Maturation of hookworms did occur in 2 pups exposed to larvae from a mixture of belly blubber, mammary tissue, and milk of pregnant cows. Parasitic 3rd-stage hookworm larvae from belly tissues of pregnant and "non-pregnant" fur seal cows averaged 938.1 and 802.1 micron long, and 34.1 and 31.5 micron wide, respectively; however, larvae from belly tissues of a fur seal bull, bachelors, 2-year-old males, male and female yearlings and pups, and Steller Sea Lion subadults averaged 640.5-732.0 micron long and 20.9-24.9 micron wide.
12只未吃过母乳的海狗幼崽被用于一项感染性实验。将幼崽暴露于来自海狗雄兽、单身雄兽和怀孕雌兽腹部组织的鲁氏钩口线虫第三期幼虫，以确定幼虫的成熟能力。在3只接受来自雄兽腹部脂肪组织幼虫的幼崽、6只接受来自单身雄兽腹部脂肪组织幼虫的幼崽以及1只未暴露的幼崽的肠道中均未发现钩虫。在2只暴露于来自怀孕雌兽腹部脂肪、乳腺组织和乳汁混合物中的幼虫的幼崽中，钩虫确实发生了成熟。来自怀孕和“未怀孕”海狗雌兽腹部组织的第三期钩虫幼虫平均长938.1微米和802.1微米，宽34.1微米和31.5微米；然而，来自海狗雄兽、单身雄兽、2岁雄兽、雌雄一岁幼兽和幼崽以及北海狗亚成体腹部组织的幼虫平均长640.5 - 732.0微米，宽20.9 - 24.9微米。
