Epidemiology of Bovine Hydatidosis: Urbanization, Dogs, Animal Care
and Proximity to Slaughterhouses are Important Risk Factors for
Cattle
Sakandar Khan1,
Muhammad Younus2, Jo Cable3, Frank Hailer3,
Asif Idrees2, Muhammad Imran Rashid1 and
Haroon Akbar1*
1Department
of Parasitology, Faculty of Veterinary Science, University of
Veterinary and Animal Sciences (UVAS) Lahore, Pakistan
2Deparment
of Pathobiology, College of Veterinary and Animal Sciences, Narowal,
Sub-campus,
University of Veterinary and Animal Sciences,
Pakistan
3Organisms
and Environment, School of Biosciences, Cardiff University, CF10
3AX, Wales, UK
*Corresponding author:
drharoonakbar@uvas.edu.pk
Abstract
Cystic echinococcosis, a neglected tropical
disease caused by Echinococcus granulosus, is of One-Health importance.
The disease has significant impact on the economy of Pakistan, where livestock
is an important pillar of farming. Given the large socio-economic and zoonotic
importance of cattle, we explored echinococcosis prevalence in livestock,
focusing on three previously little-studied districts of Punjab (Narowal,
Sheikhupura and Sialkot), Pakistan. We screened in total 1168 slaughtered cattle
for presence of hydatid cysts. The collected hydatid cysts were subjected to
microscopy, histopathology, and PCR. Overall disease prevalence was 7.7%
(n=1168), significantly higher in Narowal (9.6%) than in Sheikhupura (7.6%) and
Sialkot (5.7%). The oldest cattle group (>5 years) had significantly higher
prevalence (11.8%) than younger animals (6.8% in 3-5-year and 4% in
1-3-year-olds). Females had significantly higher prevalence (9.1%) than male
(4.9%) cattle. Significantly more cysts occurred in cattle lungs (71.4%) rather
than the liver (28.5%), and the number of fertile cysts was significantly higher
in lungs (56.9%) compared to liver (50%). PCR and sequencing of one cyst
confirmed the species to be Echinococcus granulosus, with phylogenetic
analysis clustering our ND1 sequence with the G1-G3 lineages. We found hydatid
cysts to cause histopathological changes in the host tissue surrounding the
cysts, including atrophy, fibrosis, cell degeneration and leucocytic
infiltration. General Linear Models revealed that animals (cattle and dogs) kept
near slaughterhouses, particularly in urban and semi-urban areas, significantly
increased the risk of cystic echinococcosis in cattle. Based on these findings,
we recommend a public health campaign to increase awareness of zoonotic
infections.
To Cite This Article:
Khan S, Younus M, Cable J, Hailer F, Idrees A,
Rashid MI and Akbar H, 2023. Epidemiology of bovine hydatidosis: urbanization,
dogs, animal care and proximity to slaughterhouses are important risk factors
for cattle. Pak Vet J,
43(3): 507-514. http://dx.doi.org/10.29261/pakvetj/2023.055