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1
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The seasonal incidence of parasitic helminth infection among the walking catfish, Clarias batrachus of Tripura, India

100%
Koiri R., Roy B.
Annals of Parasitology
|
2016
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tom 62
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nr 4
In the present study, a total of 868 walking catfish, Clarias batrachus, were collected during the period of April, 2012 to March, 2015, to evaluate the prevalence of helminth parasites from different parts of Tripura, Northeast India. Of these, 606 fish were found to be infected with one genus of trematode viz., Astiotrema, two genera of cestode viz., Lytocestus and Djombangia and one genus of nematode parasite viz., Anisakis. Of the three groups of parasites recovered, the major group infecting the host were found to be cestodes, followed by nematodes and trematodes. Seasonal studies show that the overall prevalence of the collected helminth parasites was highest during the postmonsoon season, followed by the monsoon and pre-monsoon seasons.
2
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Status of tick infections among semi-wild cattle in Arunachal Pradesh, India

100%
Ronghang B., Roy B.
Annals of Parasitology
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2016
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tom 62
|
nr 2
To explore the seasonal prevalence of tick infections in mithun (Bos frontalis) and yak (B. grunniens) a study was conducted in Papum Pare district, Kurung-Kumey district and West Kameng district of Arunachal Pradesh, India from December 2012 to November 2014. Adult ticks were collected from both the animals during the month of December 2012 to November 2014. Ectoparasites were identified on the basis of their morpho-anatomical features observed through light microscope. A total of nine different species of ectoparasites recovered belong to the family Ixodidae are Rhipicephalus (B.) microplus, R. (B.) geigy, Haemaphysalis davisi, H. darjeeling, H. longicornis, H. bispinosa, Ixodes acutitarsus, I. ricinus and Rhipicephalus sanguineus. Out of 129 mithun examined during the survey R. (B.) microplus and H. davisi showed 100% prevalence of infections throughout the year followed by H. longicornis (35.65%), H. bispinosa (30.23%), R. (B.) geigy (25.58%), I. acutitarsus (20.93%), H. darjeeling (7.75%), I. ricinus (1.55%) and Rhipicephalus sanguineus (0.77%). Similarly, all 21 yak examined revealed to be infected with R. (B.) microplus (100%) followed by I. acutitarsus (51.14%) and H. davisi (33.33%). In mithun the rate of infection due to all the nine ectoparasites rose to a peak during June to August. Except for the winter season, R. (B.) geigy occurred throughout the year. I. acutitarsus and H. darjeeling showed their occurrence throughout the year except during spring, however, I. ricinus and R. sanguineus occurs only during rainy season.
3

Stereoscan observations on the tegumental surface of Catatropis indicus Srivastava, 1935

100%
Tandon V., Roy B.
Acta Parasitologica
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1996
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tom 41
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nr 3
Surface microtopographical details of Catatropis indicus inhabiting the intestine of Gallus gallus dom. have been studied using scanning electron microscope. The elongated body of the fluke is free from any spines; however, tegument surrounding the oral sucker is provided with domed uniciliated papillae. Twelve pairs of gland-like ventral papillae are present on each side of the mid-ventral ridge. Four types of tegumental structures viz., blunt elongated, pointed elongated, scale-like short with round tip, and cilia-like densely packed, are present on the ventral surface. The dorsal surface is free of any papillated structures.
4

Calicophoron shillongensis sp.n. [Trematoda, Paramphistomidae], a new parasite from the goat [Capra hircus L.] in India

100%
Roy B., Tandon V.
Acta Parasitologica
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1995
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tom 40
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nr 4
Calicophoron shillongensis sp. n. occurring in the rumen of Capra hircus in Shillong, India is described. The new species is distinguished from all other members of the genus by the structure of the terminal genitalium (large ventral atrium with no ventral sphincter, weak genital papilla and wall of ventral atrium having no papillae) and the acetabulum (of cotylophoron type), and in having dome-ciliated papillae in the buccal region.
5

Opisthorchis noverca Braun, 1902: First record from a bovine host and a comparative stereoscan study of the surface topography of flukes of swine and cattle origin

100%
Roy B., Tandon V.
Acta Parasitologica
|
1992
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tom 37
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nr 4
Opisthorchis noverca, a parasite of canine hosts and man, has been recovered from pigs on several occasions. One cow, of a total of 1012 slaughtered cattle, examined in Shillong, India, was found infected with this fluke along with a heavy infection of Fasciola gigantica. A comparative SEM study on the surface topography of the flukes originating from pigs and cattle revealed differences in the shape of the tegumental spines. Opisthorchis infection hitherto has not been reported from bovine hosts.
6

Morphological and microtopographical strain variations among Fasciolopsis buski originating from different geographical areas

100%
Roy B., Tandon V.
Acta Parasitologica
|
1993
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tom 38
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nr 2
In order to reveal intra-specific strain variations, if any, morphological and SEM studies were performed on Fasciolopsis buski collected from Sus scrofa domestica in Assam and Meghalaya (India). Specimens of Assam origin showed the typical form of elongated body with unbranched simple intestinal caeca; the general body tegument both on the dorsal and ventral surfaces had transverse corrugations, with isolated bunshaped, round, smooth papillae abounding on the dorsal surface only. The flukes of Meghalaya origin showed an oval body contour, and slightly diverticulated intestinal caeca; the dorsal surface of the body is finely tuberculated but the ventral surface possesses scale-like, blunt papillae with socketed bases.
7
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Characterization of Clinostomum metacercariae using microscopic and molecular approaches

81%
Zimik P., Sharma S., Roy B.
Annals of Parasitology
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2019
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tom 65
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nr 1
One of the fundamental aspects in understanding the biology, diversity and epidemiology of a parasite lies in its proper identification. In the present study, morphological and molecular characterization of Clinostomum metacercariae recovered from an ornamental fish, Trichogaster fasciata, was carried out in order to ascertain its identity. To serve the purpose, scanning electron micrographs and gene sequences for two commonly used molecular markers, i.e., nuclear ribosomal internal transcribed spacer 2 (rDNA-ITS2) and mitochondrial cytochrome c oxidase subunit 1 (mtCO1) were obtained. The sequences were further used for generating similarity index matrix as well as inferring phylogenies. Light and electron microscopic observations on metacercariae of the parasite revealed that it belongs to the genus Clinostomum. Identification of the same up to the level of species was made possible through sequence and phylogenetic analyses. The ITS2 sequence analyses of our species (KX758630) showed similarity to unidentified Clinostomum sp. reported from Nigeria (KY865625) and China (KP110579), and C. tilapiae recorded from South Africa (KX034048) and Nigeria (KY649353). However, the CO1 gene analyses suggested it to be highly identical to C. philippinense and the same was also corroborated in the phylogenetic analysis. Thus, morphological and molecular characterization revealed that the recovered metacercariae belong to the species C. philippinense. Additionally, a brief description of secondary structures of ITS2 of various species of Clinostomum has also been discussed.
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