ç«‹å³é 約明日直æ’:
作者:寵物醫師網編委會
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ä½ æ˜¯ä¸æ˜¯ä¸€è½åˆ°â€œå¼“形蟲â€ã€â€œç‹‚犬病â€ã€å°±å¿ƒé‡Œç™¼æ€µï¼Ÿåˆ¥æ“”心,今天我們就來èŠèŠé€™å…©ç¨®ç—…原體ï¼é—œæ³¨æˆ‘們的公眾號了解更多臨床資訊ï¼
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剛地弓形蟲(Toxoplasma gondii)是一種感染包括人類在內的多種脊椎動物的細胞寄生的原蟲。雖然貓是其唯一終末宿主,但任何溫血動物å‡å¯ä½œç‚ºä¸é–“å®¿ä¸»ã€‚å¤šå¹´ä¾†ï¼Œç”±äºŽé€™ç¨®é ‚å¾©é–€å¯„ç”ŸèŸ²å»£æ³›æµè¡Œã€ä¸”為人畜共患病和能引起宿主行為的改變,一直å—åˆ°ç ”ç©¶äººå“¡çš„é—œæ³¨ã€‚
狂犬病是由彈狀病毒科 Lyssavirus 屬的病毒引起的。在全çƒèŒƒåœå…§ï¼Œç‹‚犬病病毒是該屬最é‡è¦çš„æˆå“¡ã€‚ç‹‚çŠ¬ç—…ç—…æ¯’ä»¥å…¶ç¥žç¶“ç³»çµ±ç™¥ç‹€è€Œèžå,是最為人所知的人畜共患病之一,盡管å¯ä»¥é 防,但ä»åœ¨å…¨çƒå°Žè‡´äººé¡žå’Œå‹•物æ»äº¡ã€‚這兩種病原體臨床癥狀å˜åœ¨é‡ç–Šã€‚
é—œéµè©žï¼šå¼“形蟲;狂犬病;病毒;人畜共患病
ä¸€ã€æµè¡Œç—…å¸
1.1弓形蟲
å‰›åœ°å¼“å½¢èŸ²æ˜¯ä¸€ç¨®æ„ŸæŸ“å“ºä¹³å‹•ç‰©å’Œé³¥é¡žçš„ç´°èƒžå…§åŽŸç”Ÿå¯„ç”ŸèŸ²ï¼Œä»¥è²“ç§‘å‹•ç‰©ç‚ºçµ‚æœ«å®¿ä¸»ã€‚ç ”ç©¶å‰›åœ°å¼“å½¢èŸ²IgGå’ŒIgM抗體的血清æµè¡ŒçŽ‡æ˜¯è©•ä¼°æ„ŸæŸ“æˆ–æš´éœ²äºŽè©²å¯„ç”ŸèŸ²ç‹€æ³çš„æœ€å¸¸è¦‹æ–¹æ³•。
動物和人類æ”入被貓排泄的åµå›Šæ±¡æŸ“的水或食物,或æ”入未煮熟的肉ã€ç”Ÿè‚‰ã€ç‰›å¥¶ï¼Œæˆ–通éŽèƒŽç›¤é€”徑æ”入緩殖å而感染。在ä¸é–“宿主體內感染åŽï¼Œå‰›åœ°å¼“形蟲å¯è‡ªç”±ç©¿éŽè…¸é“或胎盤上皮,進入巨噬細胞或樹çªç‹€ç´°èƒžï¼Œå¹¶åˆ†å¸ƒåˆ°ä¸åŒå™¨å®˜[6,7]。然åŽï¼Œå¯„生蟲è¦ä¹ˆåœ¨å®¿ä¸»é«”內迅速復制(速殖å),è¦ä¹ˆåœ¨å®¿ä¸»çµ„ç¹”ä¸å½¢æˆåŒ…囊(緩殖å),其ä¸éª¨éª¼è‚Œå’Œå¤§è…¦æ˜¯å®¹ç´å¾©åˆ¶çš„兩個最常見器官。雖然急性弓形蟲病ä¸å¸¸è¦‹ï¼Œä½†å¤šç¨®å¹¶ç™¼ç™¥ã€å®¿ä¸»çš„å…疫狀態以åŠå¯„ç”ŸèŸ²çš„åŸºå› åž‹ç‰å› ç´ éƒ½å¯èƒ½å½±éŸ¿ç–¾ç—…的嚴é‡ç¨‹åº¦ã€‚ç”±äºŽå‰›åœ°å¼“å½¢èŸ²èƒ½æ„ŸæŸ“å¤šç¨®å®¿ä¸»ï¼Œå¹¶å¼•èµ·å®¿ä¸»è¡Œç‚ºæ”¹è®Šå·²å¾—åˆ°å»£æ³›ç ”ç©¶[8–12]。
1.2 狂犬病
所有動物宿主也都是狂犬病病毒的傳æ’åª’ä»‹ï¼›ç„¶è€Œï¼Œå¹¶éžæ‰€æœ‰å‚³æ’媒介都是宿主。例如,盡管貓å¯ä»¥æœ‰æ•ˆåœ°å‚³æ’狂犬病病毒,但沒有貓與貓之間æŒçºŒå‚³æ’狂犬病病毒的記錄,也沒有發ç¾ç¨ç‰¹çš„貓狂犬病病毒變種。
ç‹‚çŠ¬ç—…ç—…æ¯’çš„å‚³æ’æ˜¯é€šéŽç—…毒攜帶的唾液進入組織而發生,通常是被狂犬病動物咬傷所致。唾液在出ç¾è‡¨åºŠç™¥ç‹€æ™‚或之å‰å°±å·²å…·æœ‰å‚³æŸ“性。家養狗ã€è²“和雪貂å¯èƒ½åœ¨å‡ºç¾è‡¨åºŠç™¥ç‹€å‰10天就開始排毒;而野生動物在出ç¾ç™¥ç‹€å‰å¹¾å‘¨å°±é–‹å§‹æŽ’毒的情æ³ä¹Ÿæœ‰å ±é“。狂犬病病毒尚未從è‡é¼¬çš„è‡è…ºåˆ†æ³Œç‰©ä¸åˆ†é›¢å‡ºä¾†ã€‚
ç‹‚çŠ¬ç—…ç—…æ¯’ä¸æœƒé€šéŽè¡€æ¶²å‚³æ’。點擊《》跳轉文ç«
ä¸€ç¯‡ç ”ç©¶ä½¿ç”¨äº†2022å¹´5月至2024å¹´4月期間從22種ä¸åŒå®¿ä¸»çš„903åªå‹•物(表1ï¼‰ä¸æ”¶é›†çš„å°è…¦çµ„織樣本。在俄克拉è·é¦¬å·žå‹•物疾病診斷ä¸å¿ƒï¼ˆStillwater,OK,USA)進行狂犬病病毒檢測åŽï¼Œå°‡ä¸€å°éƒ¨åˆ†åŽŸå§‹æ¨£å“(15-25 g)置于70%乙醇ä¸ï¼Œå¹¶åœ¨?80 ℃下冷å‡ä¿å˜ã€‚
表1. å„宿主檢測樣本數é‡åŠå¼“形蟲和狂犬病總體æµè¡ŒçŽ‡ã€‚
二ã€è‡¨åºŠè¡¨ç¾
2.1弓形蟲
é€Ÿæ®–åæ˜¯å¼“形蟲病ä¸å°Žè‡´çµ„ç¹”æå‚·çš„éšŽæ®µï¼›å› æ¤ï¼Œè‡¨åºŠç™¥ç‹€å–決于å—影響的組織ã€é‡‹æ”¾çš„é€Ÿæ®–åæ•¸é‡ä»¥åŠå®¿ä¸»å…疫系統é™åˆ¶å…¶å¾©åˆ¶å’Œå‚³æ’的能力。由于æˆå¹´å…疫功能æ£å¸¸çš„動物能有效控制速殖å的傳æ’,弓形蟲病通常是一種亞臨床疾病。然而,在易感物種以åŠå¹¼å¹´å’Œå…ç–«åŠŸèƒ½å—æçš„å‹•ç‰©ï¼ˆå°¤å…¶æ˜¯å¹¼çŠ¬ã€å¹¼è²“和仔豬)ä¸ï¼Œé€Ÿæ®–åæœƒå…¨èº«å‚³æ’,并引起間質性肺炎ã€å¿ƒè‚Œç‚Žã€è‚壞æ»ã€è…¦è†œè…¦ç‚Žã€è„ˆçµ¡è†œç‚Žã€æ·‹å·´çµç—…和肌炎。
相應的臨床癥狀包括發熱ã€è…¹ç€‰ã€å’³å—½ã€å‘¼å¸å›°é›£ã€é»ƒç–¸ã€ç™²ç™‡ç™¼ä½œå’Œæ»äº¡ã€‚
弓形蟲也是導致綿羊ã€å±±ç¾Šã€é¹¿ä»¥åŠæœ‰æ™‚豬æµç”¢å’Œæ»èƒŽçš„é‡è¦åŽŸå› ã€‚æ‡·å•æ¯ç¾Šæ„ŸæŸ“åŽï¼Œé€Ÿæ®–åæœƒé€šéŽè¡€æ¶²å‚³æ’到胎盤å°è‘‰ï¼Œå°Žè‡´å£žæ»ã€‚速殖å也å¯èƒ½å‚³æ’給胎兒,導致多個器官壞æ»ã€‚最åŽï¼Œå…ç–«åŠŸèƒ½å—æçš„æˆå¹´å‹•物(例如感染貓å…疫缺陷病毒的貓)極易患上急性全身性弓形蟲病,主è¦è¡¨ç¾ç‚ºç¥žç¶“和呼å¸éšœç¤™ã€‚
表2.å¼“å½¢èŸ²æª¢æ¸¬é™½æ€§å®¿ä¸»ä¸æè¿°çš„è‡¨åºŠé«”å¾ã€‚
2.2 狂犬病
狂犬病的臨床體å¾å…·æœ‰æç¤ºæ€§ï¼Œä½†å¾ˆå°‘具有確定性。所有物種的狂犬病動物通常都表ç¾å‡ºå…¸åž‹çš„ CNS 紊亂跡象,物種間差異很å°ã€‚無論物種如何,最å¯é çš„è‡¨åºŠé«”å¾æ˜¯æ€¥æ€§è¡Œç‚ºæ”¹è®Šå’Œä¸æ˜ŽåŽŸå› çš„é€²è¡Œæ€§éº»ç—¹ã€‚
行為變化å¯èƒ½åŒ…括:çªç™¼æ€§åŽé£Ÿã€æ†‚慮或緊張的體å¾ã€èˆˆå¥®æ€§ã€éŽåº¦èˆˆå¥®ï¼ˆåŒ…括異常勃起)
å—影響的動物å¯èƒ½æœƒå°‹æ±‚ç¨è™•。共濟失調ã€ç™¼éŸ³æ”¹è®Šå’Œæ°£è³ªæ”¹è®Šæ˜¯æ˜Žé¡¯çš„。å¯èƒ½æœƒç™¼å±•出ä¸å°‹å¸¸çš„æ”»æ“Šæ€§ã€‚通常,患有狂犬病的野生動物å¯èƒ½æœƒå¤±åŽ»å°äººé¡žçš„ææ‡¼ï¼Œé€šå¸¸å¯èƒ½æœƒè§€å¯Ÿåˆ°å¤œè¡Œæ€§ç‰©ç¨®åœ¨ç™½å¤©å››è™•游蕩。
狂犬病的臨床病程å¯åˆ†ç‚ºä¸‰å€‹ä¸€èˆ¬éšŽæ®µâ€”—å‰é©…æœŸã€æ€¥æ€§èˆˆå¥®æ€§å’Œéº»ç—¹æ€§ï¼ˆçµ‚末期)。然而,由于臨床體å¾çš„å¯è®Šæ€§å’ŒéšŽæ®µé•·åº¦çš„ä¸è¦å‰‡æ€§ï¼Œé€™ç¨®åŠƒåˆ†çš„å¯¦ç”¨åƒ¹å€¼æœ‰é™ã€‚
表3. 狂犬病檢測陽性宿主的臨床癥狀æè¿°
三ã€é‘’別診斷
一些宿主ä¸å ±å‘Šçš„臨床癥狀表明,弓形蟲感染å¯èƒ½æœƒè¢«èª¤è¨ºç‚ºç‹‚çŠ¬ç—…æ„ŸæŸ“ï¼Œå› æ¤æ‡‰å°‡å…¶ä½œç‚ºé‘’別診斷的é‡é»žã€‚攻擊性是æäº¤é€²è¡Œç‹‚犬病病毒檢測的主è¦åŽŸå› ä¹‹ä¸€ï¼Œåœ¨å¼“å½¢èŸ²æª¢æ¸¬å‘ˆé™½æ€§çš„å®¶é¤Šå®¿ä¸»ä¸ä¹Ÿè§€å¯Ÿåˆ°äº†æ”»æ“Šæ€§è¡Œç‚ºï¼ˆè¡¨2和表3ï¼‰ã€‚æ“šå ±é“,狗和貓出ç¾äº†ç™²ç™‡ç™¼ä½œã€‚有趣的是,弓形蟲與癲癇有關,與大腦ä¸å˜åœ¨å›Šè…«ä»¥åŠéš¨åŽçš„ç˜¢ç—•çµ„ç¹”å½¢æˆæœ‰é—œ[25]ã€‚æœ¬ç ”ç©¶ä¸å ±å‘Šçš„å…¶ä»–è‡¨åºŠç™¥ç‹€ï¼Œå¦‚è…¹ç€‰å’Œç™¼ç‡’ï¼Œåƒ…åœ¨è²“ä¸æè¿°ã€‚é›–ç„¶è¼ƒç‚ºç½•è¦‹ï¼Œä½†è²“æ„ŸæŸ“å¼“å½¢èŸ²åŽå‡ºç¾çš„臨床癥狀是由速殖å復制和傳æ’引起的炎癥和組織壞æ»å°Žè‡´çš„ã€‚æ›´å¸¸è¦‹çš„æƒ…æ³æ˜¯ï¼Œè‡¨åºŠè¡¨ç¾æ˜¯ç”±å…ç–«æŠ‘åˆ¶å’Œæ½›ä¼æ„ŸæŸ“冿¿€æ´»å¼•èµ·çš„[26]。
åœ¨ä¸€é …ç ”ç©¶ä¸ï¼Œè²“æ˜¯å®¿ä¸»ä¸æ„ŸæŸ“率最高的(表1),這很å¯èƒ½èˆ‡å¯„生蟲的生活周期有關。狗是陽性病例數é‡è¼ƒå¤šçš„第二種宿主;它們ä¸å¤ªå¯èƒ½å‡ºç¾è‡¨åºŠå¼“å½¢èŸ²ç—…ï¼Œè€Œå…¶ä»–ç—…åŽŸé«”ï¼Œå¦‚çŠ¬ç˜Ÿç†±ç—…æ¯’ã€æ–°å¢å蟲和神經肉å¢å蟲,往往與臨床癥狀有關[27,28]。通éŽå¯¦æ™‚PCR檢測,未發ç¾ç‹—感染新å¢å蟲。絕育公狗與未絕育公狗的比較顯示,兩者之間å˜åœ¨çµ±è¨ˆå¸é¡¯è‘—差異,絕育公狗ä¸7.94%(5/63)為弓形蟲陽性,而未絕育公狗ä¸åƒ…1.61%(3/186)為陽性(p=0.02)。雖然我們無法解釋這種差異,但感染狗體內å¯èƒ½æœƒç™¼ç”Ÿæ¿€ç´ 變化;先å‰çš„ç ”ç©¶å·²è‰æ˜Žï¼Œæ„ŸæŸ“弓形蟲的嚙齒類動物內分泌系統發生改變,與未感染的嚙齒類動物相比,去勢雄性嚙齒類動物çªä¸¸é…®æ°´å¹³æ›´é«˜ï¼Œå°è²“å°¿å‘³çš„åŽæƒ¡æ„Ÿé™ä½Ž[29,30]ã€‚å…ˆå‰æ¯”è¼ƒç‹—ç¾¤çš„ç ”ç©¶æè¿°ï¼Œèˆ‡æ”¶å®¹æ‰€çš„狗相比,寵物狗的弓形蟲血清陽性率更高[4],這å¯èƒ½æ˜¯ç”±äºŽå®¶åºç’°å¢ƒä¸ç‹—和貓接觸更密切,也å¯èƒ½ä»£è¡¨é è¿‘è²“çš„çµ•è‚²å¯µç‰©ç‹—æ•¸é‡æ›´å¤šã€‚
在檢測的生產動物ä¸ï¼Œåƒ…發ç¾ç‰›å‘ˆé™½æ€§ã€‚æ“šå ±é“,與牛相比,綿羊和山羊腦組織和生殖組織ä¸å¼“å½¢èŸ²åŒ…å›Šçš„å½¢æˆæ›´ç‚ºæ™®é[31],但牛肉牛在弓形蟲æµè¡Œç—…å¸ä¸çš„作用ä»ä¸æ¸…楚。然而,é‡è¦çš„æ˜¯å»ºè°é£Ÿç”¨ç†Ÿç‰›è‚‰ï¼Œå¹¶é¿å…將牛肉喂給寵物。
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弓形蟲和狂犬病是é‡è¦çš„äººç•œå…±æ‚£ç—…ï¼Œéœ€è¦æŒ‰ç…§â€œåŒä¸€å¥åº·â€ç†å¿µé€²è¡Œå¦¥å–„é é˜²ã€æª¢æ¸¬å’Œæº–ç¢ºè¨ºæ–·ã€‚æœ¬ç ”ç©¶è¡¨æ˜Žï¼Œåœ¨æŽ’é™¤ç‹‚çŠ¬ç—…é™½æ€§ç—…ä¾‹æ™‚ï¼Œæ‡‰æª¢æ¸¬å¼“å½¢èŸ²ï¼Œå› ç‚ºå¼“å½¢èŸ²æ„ŸæŸ“çš„è‡¨åºŠè¡¨ç¾å’Œå°è…¦çµ„ç¹”çš„å—œæ€§èˆ‡ç‹‚çŠ¬ç—…ç›¸ä¼¼ã€‚ç›¡ç®¡æœ¬ç ”ç©¶ä¸æœªç™¼ç¾åˆå¹¶æ„ŸæŸ“病例,但ä»éœ€è€ƒæ…®ä¸€äº›å±€é™æ€§ï¼Œå¦‚用于分æžçš„組織切片較å°ã€æ¨£æœ¬ä¿å˜åœ¨ä¹™é†‡æº¶æ¶²ä¸ä»¥åŠç—…å²ä¿¡æ¯æœ‰é™ã€‚采用ä¸åŒæ¨£æœ¬ä¿å˜æ–¹æ³•ã€è©³ç´°ç—…å²è¨˜éŒ„ä»¥åŠæ“´å¤§åœ°ç†èŒƒåœé€²è¡Œé€²ä¸€æ¥åˆ†æžï¼Œå°‡æœ‰åŠ©äºŽäº†è§£åœ¨æª¢æ¸¬ç‹‚çŠ¬ç—…æ™‚ï¼Œå¼“å½¢èŸ²åœ¨å®¶é¤Šå‹•ç‰©å’Œé‡Žç”Ÿå‹•ç‰©ä¸çš„æµè¡Œæƒ…æ³ã€‚
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