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題 名 | Cryptosporidium parvum Oocyst Shedding in Neonatal Calf Diarrhea Syndrome in Southern Taiwan=臺灣南部地區新生仔牛下痢徵候群之微小隱孢子蟲(Cryptosporidium parvum)卵囊排出情形 |
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作 者 | 吳永惠; 曾巨羽; 黃卓智; 張清棟; 張聰洲; | 書刊名 | 臺灣獸醫學雜誌 |
卷 期 | 36:1 2010.03[民99.03] |
頁 次 | 頁1-6 |
分類號 | 437.37 |
關鍵詞 | 微小隱孢子蟲; 新生仔牛下痢徵候群; 仔乳牛; 臺灣; Cryptosporidium parvum; Neonatal calf diarrhea syndrome; Dairy calves; Taiwan; |
語 文 | 英文(English) |
中文摘要 | 為調查台灣南部地區乳牛場仔牛微小隱孢子蟲(Cryptosporidium parvum)卵囊排出情形與下痢閒之相關性,對已知有C. parvum bovine genotype感染之乳牛場6場48頭新生仔牛,於出生後每隔3天1次連續1個月採其糞便,以修飾性Ziehel-Neelsen染色法測其每公克糞便卵囊數(oocyst per gram, OPG),並記錄其糞便性狀,此外逢機採集66個下痢便樣本,以市售檢查抗原之ELISA套組確認有無C. parvum、rotavirus、coronavirus或E. coil F5等常見腸病原性病原。結果如下:有79.2%(38/48)仔牛在一個月齡內糞便被檢查到有卵囊,陽性仔牛有60.5%(23/38)在4曰齡(第2次採樣)即首次被檢查到有卵囊排出,最高卵囊檢出率(71.1-789%)在7-16日齡間(第3-6次採樣),卵囊排出期間多樣(持續於1次至8次採樣中);在66個下痢便樣本之腸病原偵測中,除了6個(9.P%)單獨為C. parvum和1個(1.5%)單獨為E. coil F5外,其餘59個(89.4%)為C. parvum合併rotavirus、coronavirus和/或E. coil。與卵囊出現前或卵囊消失後相比,卵囊開始出現日之仔牛下痢比率顯著(P<0.05)增加,而且在OPG上升期間之下痢比率更高,在卵囊消失後下痢之比率亦迅速下降。基於這些發現,我們認為C. parvum慼染在南台灣新生仔牛下痢症候群中伴演重要之致病性角色。 |
英文摘要 | The objective of this study was to investigate the relationship between oocyst shedding of Cryptosporidium parvum and diarrhea in dairy calves in southern Taiwan. A total of 48 neonatal calves from six different farms known to be positive for Cryptosporidium parvum bovine genotype were included in this study. Feces were collected from each calf every three days during their first month of life. The consistency of each fecal sample was noted, and the number of oocysts per gram (OPG) of feces was calculated using modified Ziehel-Neelsen stain (MZN). In addition, a commercial antigen-based ELISA diagnostic kits for C, parvum, rotavirus, coronavirus and E. coil F5 was employed to identify the presence of common enteropathogenic agents in 66 randomly selected diarrheic samples. The results were as the following: Oocysts were detected in the feces of 79.2% (38/48) calves within the first month of life. Oocysts were first detected in 60.5% (23/38) of positive calves at 4 days of age (the time of the second sampling). The highest oocyst detection rate (71.1-78.9%) occurred between 7 and 16 days of age (the third to the sixth sampling). The oocystexcretion period varied from the first to the eighth sampling. Of the 66 diarrhea samples analyzed for the enteropathogenic agents, 6 (9.1%) and 1 (1.5%) were found to have the single pathogen C, parvum and 1 E, coil F5, respectively, and 59 (89.4%) were C, parvum association with rotavirus, coronavirus and/or E, coil. The ratio of diarrheic feces was significantly (P<0.05) higher on the oocyst initial excretion day compared to oocyst pre-excretion period or oocyst-disappearance period. In addition, more calves became diarrhea during the periods of elevated OPGs, and the occurrence of diarrhea rapidly decreased after the oocyst disappearance in the feces. Based on these findings, we concluded that C. parvum infection plays an important pathogenic role in neonatal calf diarrhea syndrome in southern Taiwan. |
本系統中英文摘要資訊取自各篇刊載內容。