Journal of Threatened Taxa |
www.threatenedtaxa.org | 26 September 2022 | 14(9): 21900–21902
ISSN 0974-7907 (Online) | ISSN 0974-7893 (Print)
https://doi.org/10.11609/jott.5870.14.9.21900-21902
#5870 | Received 14 March 2020 | Final received 19 July 2022
| Finally accepted 20 September 2022
Visceral
tetrathyridiosis Mesocestoides
sp. (Cestoda: Cyclophyllidea) in a wild Barn Owl Tyto
alba - a first report and new host record
P.G. Vimalraj 1 &
A. Latchumikanthan 2
1 Sridhar
Nagar, Ariyankuppam, Pondicherry 605007, India.
2
VUTRC, Tamil Nadu Veterinary and Animal Sciences
University, Madhavaram Milk Colony, Chennai, Tamil Nadu 605602, India.
1
vemalrajpg@gmail.com (corresponding
author), 2 latchupara2010@gmail.com
Editor: Bahar Baviskar,
Wild-CER, Nagpur, India. Date of publication: 26 September
2022 (online & print)
Citation: Vimalraj,
P.G. & A. Latchumikanthan (2022). Visceral tetrathyridiosis Mesocestoides sp. (Cestoda:
Cyclophyllidea) in a wild Barn Owl Tyto alba -
a first report and new host record. Journal of Threatened Taxa 14(9): 21900–21902.
https://doi.org/10.11609/jott.5870.14.9.21900-21902
Copyright: © Vimalraj & Latchumikanthan 2022.
Creative Commons Attribution 4.0 International License. JoTT allows
unrestricted use, reproduction, and distribution of this article in any medium
by providing adequate credit to the author(s) and the source of publication.
Funding: None.
Competing interests: The authors declare no competing interests.
Acknowledgements: Authors would like to thanks Dr. Karrie Rose DVM, DVSc, Taronga Conservation Society Australia, NSW and Dr. Allan Pessier, DVM, clinical
associate professor Washington Animal Disease Diagnostic Laboratory, Washington
State University for the scientific cooperation and analysis and other fellow
veterinarians.
Mesocestoides
sp. is most commonly recorded in all parts of the
world (Soulsby 1982) except Australia (Bradley et al.
2018) and this is probably the first record from India. Incidence depends on
the species and the region and the disease caused by Mesocestoides
sp. tapeworms is called as mesocestoidosis or mesocestoidiasis. Predilection site of adult Mesocestoides sp. tapeworms is
the small intestine.
Tapeworms of the genus Mesocestoides
sp. require three hosts. The primary definitive host are carnivorous mammals or
birds of prey and it does not affect cattle, sheep, goats, swine or horses
(Padgett & Boyce 2004). Tetrathyridium is a
second stage larvae affecting vertebrate (second intermediate host) and the
first stage larvae (metacestode) of first
intermediate host is unknown but believed to be an
coprophagous arthropod (Brigitte 1991). Mesocestoides
species can live in a wide range of hosts, but are
particularly widespread in carnivores (Barker et al. 1993; Tenora 2004;
David et al. 2011).
Tetrathyridium
attached to internal organs were torn loose or cut free and fixed in histo-pathological examinations in 10% neutral-buffered
formalin. During necropsy, the encapsulated tetrathyridium
were searched throughout the body with a bright LED light source. Formalin
fixed tissues were processed by routine paraffin embedding method and
4-μm-thick sections mounted and stained with hematoxylin and eosin (HE).
The tissues samples were examined under light microscope. (Rifki
et al. 2005; Karl et al. 2016).
Microscopic examination of the tissue samples taken
from the liver and lung revealed chronic multiple pyogranuloma due to
infestation by Mesocestoides sp. Individual
larvae (around six number) were different in shape with convoluted borders.
Thick eosinophilic cuticle lined larvae resemble a single layer of cells. The
remaining body of the parasite was composed of a loose mesenchymal network with
widely scattered parenchymal and muscle cells. Numerous clear vesicles/
refractile bodies namely calcareous corpuscles, round to oval in shape, were observed
within the stroma of the parasite. Mineralized areas were seen in some of the
old lesions (Soulsby
1982; McAllister 2014; McAllister et al. 2018).
Tetrathyridia
in the liver parenchyma were surrounded by a thick mantle of inflammatory cells
and a scant, loose connective tissue. In some lesions, there were small
lymphocytic nodules at the periphery. No reactive changes were seen in the
visceral peritoneum except in superficial lesions where the inflammation
extended to the liver surface. Single tetrathyridia
occurred in each nodule.
Tetrathyridium
on the pleura surface of the lungs were surrounded by a thin layer of loose
connective tissue that appeared to be continuous with the pleura. The inner
lining of the capsule was partly lined by flattened epithelial-like cells.
There was a mild inflammatory reaction to the tetrathyridia,
with infiltration of a few macrophages, lymphocytes, and plasma cells. In all
lesions examined, tetrathyridia were intact and
showed no evidence of degeneration.
We conclude that, Tetrathyridium
has been reported in various vertebrate hosts, including wild and domestic
animals like birds, snakes, frogs, and rodents (Soulsby
1982; Frank 1991; McAllister et al. 2017) but this is the first record from
Barn Owl. Prey species were more prone to risk due to hunting or
scavenging on small vertebrates infected with tetrathyridia
and detailed molecular discrimination (Skirnisson
et al. 2016) within the species to be studied. There are no
real effective preventative measures that prevent Mesocestoides tapeworm
infection. Effective prevention and control can be achieved with numerous anthelmintic products in domestic
animals but less possible in wildlife (Ivan et al.
2004; Ubelaker et al.
2014). Biological control of Mesocestoides
is so far not feasible and there are no reports on resistance of Mesocestoides tapeworms to anthelmintics.
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