Atkinson C T, Wright S D, Telford S R, McLaughlin G S, Forrester D J, Roelke M E, McCown J W
National Wildlife Health Research Center, Hawaii Volcanoes National Park 96718.
J Wildl Dis. 1993 Jan;29(1):73-84. doi: 10.7589/0090-3558-29.1.73.
Three morphologically distinct types of sarcocysts (I, II, and III) were identified by light microscopy in tongues from 403 white-tailed deer (Odocoileus virginianus) collected in Florida (USA) over a 7-yr-period. Based on electron microscopy of representative examples of these sarcocysts, there were four distinctive wall structures. We concluded that one of these (Type I) was representative of Sarcocystis odocoileocanis and another (Type III) was representative of an unnamed species previously described from white-tailed deer in Montana. Type II could be divided further into two forms (IIA and IIB) that may represent two underscribed species or developmental stages of the same species. Sarcocystis odoi, another previously recognized sarcosporidian from white-tailed deer, was not found. Sarcocysts of Types I and II were distributed nonrandomly in tongue muscle, being more common in the basal portion, whereas Type III was distributed randomly throughout the tongue. Single infections (one of the three types) accounted for 63% of the infected deer, while double infections occurred in 28% and triple infections in 4%. Types I and II were found in deer throughout the state, but Type III occurred only in deer from southern Florida. In 1988 and 89, the statewide prevalences for Types I, II, and III were 57, 20, and 6%, respectively. Prevalences of Type I ranged from 94% in the panhandle region (northern Florida) to 34% in the southern part of the state. Prevalences of all three types increased with age.
在7年的时间里，从美国佛罗里达州采集的403只白尾鹿（弗吉尼亚鹿）的舌头中，通过光学显微镜鉴定出三种形态不同的肉孢子虫类型（I、II和III）。基于这些肉孢子虫代表性样本的电子显微镜观察，有四种独特的壁结构。我们得出结论，其中一种（I型）代表犬弗吉尼亚鹿肉孢子虫，另一种（III型）代表先前在蒙大拿州白尾鹿中描述的未命名物种。II型可进一步分为两种形式（IIA和IIB），它们可能代表两个未充分描述的物种或同一物种的发育阶段。未发现另一种先前确认的来自白尾鹿的肉孢子虫——弗吉尼亚鹿肉孢子虫。I型和II型肉孢子虫在舌肌中的分布是非随机的，在基部更常见，而III型则随机分布于整个舌头。单一感染（三种类型之一）占感染鹿的63%，双重感染占28%，三重感染占4%。I型和II型在该州各地的鹿中都有发现，但III型仅出现在佛罗里达州南部的鹿中。1988年和1989年，I、II和III型在全州的患病率分别为57%、20%和6%。I型的患病率从狭长地带地区（佛罗里达州北部）的94%到该州南部的34%不等。所有三种类型的患病率都随年龄增长而增加。
