常盤 俊大

動物展示施設で飼育されたカピバラ6頭のうち2頭に下痢がみられ、メトロニダゾールの投与により一時的に便性状の改善を認めたが、その後に再度水様下痢を呈し死亡した。生存個体の糞便には腸管に寄生するオフリオスコレックス科繊毛虫を多数認めたが、これらの繊毛虫はメトロニダゾール投与歴のある1頭および死亡2症例では検出できなかった。これらの結果より、植物食であるカピバラの消化吸収の大部分を担う盲腸内発酵を支える共生繊毛虫への影響も今後考慮する必要があると思われた。(著者抄録)

We described the infraciliature of Opisthotrichum janus, Epidinium ecaudatum, and Ophryoscolex purkynjei, belonging to the family Ophryoscolecidae, from pyridinated silver carbonate impregnated specimens. The adoral polybrachykinety is C-shaped in Opi. janus, whereas it is spiral-shaped in Epi. ecaudatum and Oph. purkynjei. The vestibular polybrachykinety is slender and short in Opi. janus, whereas slender and long in Epi. ecaudatum and Oph. purkynjei. The paralabial kineties are composed of several short kineties along the adoral polybrachykinety. The dorsal polybrachykinety is displaced posteriorly. This study provides information on the diagnostic features of the subfamily Ophryoscolecinae to which Opi. janus, Epi. ecaudatum, and Oph. purkynjei belong. A C-shaped or spiral-shaped adoral polybrachykinety and slender vestibular polybrachykinety are the diagnostic features of the subfamily Ophryoscolecinae in addition to their general features of a cylindrical body, tubular vestibulum, dorsal ciliary zone considerably displaced posteriorly, well developed skeletal plates, and macronucleus beneath the right body surface. Opi. janus, Epi. ecaudatum, and Oph. purkynjei show the basic form of morphogenesis of the ciliature, similar to that in the subfamily Diplodiniinae, with four primordia developing into the oral and dorsal ciliature.

Hepatozoon apri n. sp. is described from Japanese wild boars Sus scrofa leucomystax in Japan. The gamonts in the peripheral blood leukocytes were 11.6 ± 1.4 × 6.7 ± 1.3 μm in size. The meronts in the muscle tissues were 35.0–47.5 μm in length and 26.5–30 μm in width. A high rate (53.0%) of infection was found by nested PCR using muscle specimens from 181 wild boars captured in Tokushima, Japan. A phylogenetic analysis based on 18S rRNA gene sequences revealed that H. apri n. sp. detected in wild boars is closely related to Hepatozoon spp. isolated from carnivores. This is the first description of a species belonging to the genus Hepatozoon detected in ungulates.

A new entodiniomorphid ciliate species, Gorilloflasca africana n.g., n. sp. was described from the Virunga mountain gorillas, Gorilla beringei beringei, in Rwanda. It is characterized by a flask-shaped body, a long tubular vestibulum, a round frontal lobe, a large posterior cavity, an ellipsoidal or peanut-shaped macronucleus and a single contractile vacuole. G. africana has the adoral and the vestibular ciliary zones in the buccal area. The adoral ciliary zone is non-retractable, encircling the vestibular opening. The vestibular ciliary zone extends posteriorly in the vestibulum. The somatic ciliary zones are the cavity ciliary zone in the posterior cavity along the ventral side of its opening and two longitudinal ciliary zones on the dorsal body surface. The buccal infraciliary bands of G. africana are a C-shaped adoral polybrachykinety, a stick-shaped vestibular kinety band, and paralabial kineties. The anterior region of the vestibular kinety band is composed of short kineties whereas, kineties in the remaining region are longitudinal. The somatic infraciliary bands are a cavity polybrachykinety and two longitudinal polybrachykineties. Gorilloflasca is a member of the family Blepharocorythidae based on the non-retractable adoral ciliary zone, the frontal lobe, the large posterior cavity and the vestibular longitudinal kineties. (C) 2017 Elsevier GmbH. All rights reserved.

<p> 動物園や水族館で飼育動物が死亡した際，多くの施設では動物を剖検して必要な検体を採材・保存し，自施設で検査を実施，または外部の検査機関に検体を送付している。疾病診断や死因究明のためには様々な検査結果を総合的に判断する必要があるが，それは正しいサンプリング方法をとることが大前提となる。検体の採取，保存，輸送にあたっては，適切な方法で実施されなければ期待される検査結果が得られないことが多い。検査目的に合わせて適切な採材方法を選択することは，早期かつ正確な診断につながり，後に続く飼育個体の死亡を防ぐことができる。迅速で正しい診断を得ることは，飼育管理を円滑に行ううえでも不可欠である。検査が無駄とならないようにするためには，検査を依頼する側と実施する側双方の実情を知ることが重要であり，日頃からコミュニケーションを図る必要がある。</p>

BackgroundVarious pathogens cause skin diseases in lizards. An outbreak of skin disease occurred in a population of 100 inland bearded dragons at a breeding facility in Japan; 50 developed skin lesions and 15 mortalities were reported. Hypothesis/ObjectivesTo identify the pathogens responsible for the skin lesions and to determine the cause of death. AnimalsEight specimens (three dead, two euthanized, three living) were randomly selected from a group of inland bearded dragons with skin lesions consisting of multifocal superficial dermatitis. MethodsBiopsy samples were taken from skin lesions and healthy skin of the live specimens. Postmortem examinations were performed on the dead and euthanized specimens. Skin samples were processed for microbiological culture, 16S ribosomal DNA (rDNA) sequencing for bacteria, ranavirus major capsid protein (MCP) gene sequencing and histopathological examination. Histopathological examinations were also performed on postmortem tissue samples. ResultsBoth Austwickia chelonae and ranavirus (DNA) were detected in the skin lesions. Pathological examination revealed no significant visceral lesions caused by A. chelonae or ranavirus infection in dead specimens. Conclusions and clinical importanceTo the best of the authors' knowledge this is the first report of dermatophilosis due to A. chelonae infection in lizards and the first description of a concurrent infection with a ranavirus. The combined infection associated with the skin lesions may have been the primary cause of death. Co-infection with a ranavirus should be considered as a possible factor in cases of reptilian dermatophilosis. Resume ContexteDes pathogenes varies sont responsables des dermatoses des lezards. Un foyer de dermatose s'est produit dans une population de 100 agames barbus d'elevage au Japon; 50 ont developpe des lesions cutanees et 15 morts ont ete rapportes. Hypotheses/ObjectifsIdentifier les pathogenes responsables des lesions cutanees et determiner la cause de la mort. SujetsHuit cas (trois morts et deux euthanasies, trois vivants) ont ete choisis au hasard d'un groupe d'agames barbus ayant des lesions consistants en une dermatite superficielle multifocale. MethodesDes echantillons de biopsies ont ete preleves des lesions cutanees et de la peau saine des cas vivants. Des examens post-mortem ont ete realises sur les cas euthanasies et morts. Des echantillons cutanes ont ete preleves pour culture microbiologique, sequencage d'ADN ribosomal 16S (rDNA) pour des bacteries, sequencage genetique de MCP (major capsid protein) de ranavirus et examens histopathologiques. Les examens histopathologiques etaient egalement realises sur des echantillons de tissus post mortem. ResultatsA la fois Austwickia chelonae et ranavirus (DNA) ont ete detectes dans les prelevements cutanes. L'examen pathologique n'a pas permis de mettre en evidence de lesions viscerales causees par une infection a A. chelonae ou ranavirus dans les cas morts. Conclusions et importance cliniqueA la connaissance des auteurs, ceci est le premier cas de dermatophilose due a A. chelonae chez les lezards et la premiere description d'une infection concomitante avec un ranavirus. L'infection combinee associee aux lesions cutanees pourrait etre la cause primaire de la mort. Une co-infection a ranavirus devrait etre consideree comme un facteur possible de dermatophilose reptilienne. Resumen Introduccionvarios patogenos causan enfermedades de la piel en lagartos. Se produjo una epizootia de enfermedad de la piel en una poblacion de unos 100 dragones barbudos en unas instalaciones de cria en cautividad de Japon; 50 desarrollaron lesiones de la piel y se produjeron 15 muertes. Hipotesis/Objetivosidentificar patogenos responsables de las lesiones de la piel y determinar la causa de mortalidad. Animalesocho especimenes (tres muertos, dos eutanasiados, y tres vivos (fueron seleccionados de forma aleatoria de un grupo de dragones barbudos con lesiones de la piel que consistieron en dermatitis superficial multifocal. Metodosse tomaron muestras de biopsia de lesiones de la piel y la piel sana de los animales vivos. Se realizo un examen postmortem en los animales muertos y eutanasiados. Las muestras de piel se procesaron para cultivo microbiologico, secuenciacion del DNA 16S ribosomal (rRNA), secuenciacion genica de la proteina mayor de la capside de ranavirus (MCP) y examen histopatologico. Tambien se desarrollo examen histopatologico de las muestras postmortem de otros tejidos Resultadosse detectaron Austwickia chelonae y ranavirus (DNA) en las lesiones de la piel. El examen patologico revelo ausencia de lesiones viscerales significativas causadas por A. chelonae o ranavirus en los animales muertos. Conclusion e importancia clinicaa nuestro entender esta es la primera descripcion de dermatofilosis causada por infeccion con A. chelonae en lagartos y la primera descripcion de infeccion concurrente con ranavirus. La infeccion combinada produciendo lesiones de la piel puede haber sido la causa primaria de mortalidad. La co-infeccion con ranavirus debe considerarse como un factor importante en casos de dermatofilosis en reptiles. Zusammenfassung HintergrundVerschiedene Pathogene verursachen Hauterkrankungen bei Echsen. In einer Zuchtungseinrichtung in Japan brach eine Hautkrankheit bei einer Population von 100 Binnenbartagamen aus; 50 Tiere entwickelten Hautveranderungen und 15 Tiere starben. Hypothese/ZieleEine Identifizierung der Pathogene, die fur die Hautveranderungen verantwortlich waren und eine Feststellung der Todesursache. TiereAcht Exemplare (drei tote, zwei euthanasierte, drei lebende) wurden zufallig aus einer Gruppe von Binnenbartagamen, die Hautveranderungen aufwiesen, die einer multifokalen oberflachlichen Dermatitis entsprachen, ausgewahlt. MethodenEs wurden Biopsien von Hautveranderungen und von gesunder Haut der lebenden Exemplare genommen. Es wurden post mortem Untersuchungen an den toten und euthanasierten Exemplaren durchgefuhrt. Aus den Hautproben wurden mikrobielle Kulturen angelegt, sowie 16S ribosomale DNA (rDNA) Sequenzierung fur Bakterien, Ranavirus Major Capsid Protein (MCP) Gensequenzierung und eine histopathologische Untersuchung durchgefuhrt. Histopathologische Untersuchungen wurden ebenfalls an post mortem Gewebe durchgefuhrt. ErgebnisseSowohl Austwickia chelonae als auch Ranavirus (DNA) wurden in den Hautveranderungen gefunden. Bei der pathologischen Untersuchung der toten Exemplare wurden keine signifikanten viszeralen Veranderungen durch A. chelonae oder Ranavirus festgestellt. Schlussfolgerungen und klinische BedeutungNach bestem Wissen der Autoren handelt es sich hierbei um den ersten Bericht einer Dermatophilose aufgrund einer A. chelonae Infektion bei Echsen und um die erste Beschreibung einer gleichzeitigen Ranavirus Infektion. Die kombinierte Infektion, zusammen mit den Hautveranderungen, konnte die Primarursache fur den Tod der Tiere gewesen sein. Eine Co-Infektion mit Ranavirus sollte als moglicher Faktor bei Fallen von Dermatophilose bei Reptilien bedacht werden.

In February 2014, wild American bullfrog Lithobates catesbeianus tadpoles from an artificial pond in the Kyusyu region, Japan, presented with coelomic and subcutaneous edema and erythema within the skin. A pathological examination of 57 tadpoles of American bullfrogs in the region was conducted to evaluate the disease. Crystal deposition of varying degrees was found in the kidneys of 35 tadpoles (61.4%). The crystals were transparent, pleomorphic in shape, highly birefringent in polarized light, and arranged in a radial pattern within the renal tubular lumen. Using Alizarin Red S stain and liquid chromatography, these crystals were identified as calcium oxalate. Severe coelomic and subcutaneous edema was observed in 7 of these 35 tadpoles (20.0%). Ammonia levels in coelomic fluid were extremely elevated (&gt; 1000 mu g dl(-1)) in 4 tadpoles examined. These findings suggest that oxalate deposition in kidneys causes metabolic disorder with renal nephropathy. The source of the oxalate could not be determined; however, the presence of calcium oxalates in pond sediments, as revealed by liquid chromatography, suggested that the deposition was most likely due to ingestion of oxalate materials from the environment. This is the first report of oxalate nephropathy in free-living amphibians.

Roundworms of the genus Baylisascaris are natural parasites primarily of wild carnivores, and they can occasionally cause infection in humans and animals. Infection results in visceral larva migrans and/or neural larva migrans, which can be severe or fatal in some animals. Recently, Baylisascaris nematodes isolated from kinkajous (Potos flavus) and previously referred to as Baylisascaris procyonis were renamed as Baylisascaris potosis; however, data regarding the pathogenicity of B. potosis towards animals and humans are lacking. In the present study, we experimentally infected squirrel monkeys (Saimiri sciureus) with B. potosis to determine the suitability of the monkey as a primate model. We used embryonated eggs of B. potosis at two different doses (10,000 eggs and 100,000 eggs) and examined the animals at 30 days post-infection. Histopathological examination showed the presence of B. potosis larvae and infiltration of inflammatory cells around a central B. potosis larvae in the brain, intestines, and liver. Nevertheless, the monkeys showed no clinical signs associated with infection. Parasitological examination revealed the presence of B. potosis larvae in the intestines, liver, lung, muscles, brain, kidney, and diaphragm. Our findings extend the range of species that are susceptible to B. potosis and provide evidence for the zoonotic potential of larva migrans in high dose infections. (C) 2015 Elsevier Ireland Ltd. All rights reserved.

The present study evaluated the pathogenicity of Baylisascaris potosis, a newly described ascarid nematode, in Mongolian gerbils. Gerbils were infected with varying doses of either B. potosis or Baylisascaris transfuga embryonated eggs (100, 1,000, and 4,000) for 30 days postinfection (pi). Baylisascaris potosis-infected gerbils showed no clinical signs of disease; however, gerbils exposed to 1,000 and 4,000 B. transfuga eggs showed severe neurologic signs at 22-29 days and 14-15 days pi, respectively. Histopathologic examination revealed larvae and lesions in the intestine, lung, liver, and muscles of B. potosis-infected gerbils, but not in the brain, whereas B. transfuga larvae were found only in the brain and muscle. These results indicate that B. potosis larvae migrate through numerous organs and are associated with visceral larva migrans in gerbils, but less frequently migrate to the nervous system in gerbils than does B. transfuga.

This report describes a case of peritoneal larval cestodiasis caused by tetrathyridia of IVIesocestoides sp. in an adult female squirrel monkey. The monkey had lived in a zoological garden in Japan and had a clinical history of wasting. At necropsy, numerous whitish oval masses were found in the liver and peritoneal cavity. These masses contained larval cestodes. Morphological observation and molecular analyses of the mitochondrial 125 ribosomal RNA gene and cytochrome c oxidase subunit 1 gene sequences allowed us to identify the larva as the tetrathyridium of Mesocestoides sp. This is the first report of Mesocestoides larvae in a squirrel monkey in Japan. (C) 2014 Elsevier Ireland Ltd. All rights reserved.