异尖线虫病的主要致病源是简单异尖线虫幼虫。
Anisakis simplex larvae is the most important causative agent of anisakiasis.
一旦一种新的致病源传播给一个个体，它可能向更多的人传播。
Once a new pathogen is introduced in one individual, it may spread to the larger population.
黑色素瘤致病源自热衷于在假日太阳灯浴床和晒黑，这一疾病每年夺去50名40岁以下女性的生命。
A love of sunbeds and "binge tanning" on holiday are the root causes of the disease, which kills 50 women under the age of 40 each year.
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