Campylobacter jejuni infection associated with relatively poor condition and low survival in a wild bird

Campylobacter jejuni is the most common foodborne pathogen in industrialized countries. Most human infections come from contaminated poultry, but wild birds are also known to harbor C. jejuni. Wild birds are often described as asymptomatic carriers, but this assumption is based on domestic poultry research. We studied the effects of C. jejuni infection on body condition and survival of adult and nestling American crows Corvus brachyrhynchos in Davis, California. Previous work demonstrated that more than half of the crows in this population are infected with C. jejuni and that at least some of the isolates carried by crows are similar to those found in domestic animals and humans. In this study, we compared the body condition of infected and uninfected individuals at the time of capture among adults (n = 44; 52% infected) and nestlings (n = 97; 77% infected). We subsequently monitored these banded individuals for up to 3 yr and used mark–recapture survival analysis to estimate relationsh...

空肠弯曲杆菌（Campylobacter jejuni）是工业化国家中最常见的食源性病原体。人类感染大多源于受污染的家禽，但野生鸟类也被证实携带空肠弯曲杆菌。野生鸟类常被描述为无症状携带者，但这一假设是基于家养家禽的研究得出的。我们研究了空肠弯曲杆菌感染对加利福尼亚州戴维斯地区成年及雏鸟阶段美国乌鸦（Corvus brachyrhynchos）的身体状况与存活情况的影响。此前的研究表明，该种群中超过半数的乌鸦感染了空肠弯曲杆菌，且乌鸦携带的至少部分菌株与家养动物及人类体内发现的菌株相似。本研究中，我们比较了捕获时成年乌鸦（n = 44；52%感染）与雏鸟（n = 97；77%感染）中感染个体与未感染个体的身体状况。随后，我们对这些佩戴标记的个体进行了长达3年的监测，并采用标记重捕存活分析来评估……