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. 2018 Mar 15;15(1):45.
doi: 10.1186/s12985-018-0958-y.

Molecular analysis of partial VP-2 gene amplified from rectal swab samples of diarrheic dogs in Pakistan confirms the circulation of canine parvovirus genetic variant CPV-2a and detects sequences of feline panleukopenia virus (FPV)

Nisar Ahmed  1 , Adeel Riaz  1 , Zahra Zubair  1 , Muhammad Saqib  2 , Sehrish Ijaz  1 , Muhammad Shah Nawaz-Ul-Rehman  1 , Ahmed Al-Qahtani  3   4 , Muhammad Mubin  5
Affiliations

Molecular analysis of partial VP-2 gene amplified from rectal swab samples of diarrheic dogs in Pakistan confirms the circulation of canine parvovirus genetic variant CPV-2a and detects sequences of feline panleukopenia virus (FPV)

Nisar Ahmed et al. Virol J. .

Abstract

Background: The infection in dogs due to canine parvovirus (CPV), is a highly contagious one with high mortality rate. The present study was undertaken for a detailed genetic analysis of partial VP2 gene i.e., 630 bp isolated from rectal swab samples of infected domestic and stray dogs from all areas of district Faisalabad. Monitoring of viruses is important, as continuous prevalence of viral infection might be associated with emergence of new virulent strains.

Methods: In the present study, 40 rectal swab samples were collected from diarrheic dogs from different areas of district Faisalabad, Pakistan, in 2014-15 and screened for the presence of CPV by immunochromatography. Most of these dogs were stray dogs showing symptoms of diarrhea. Viral DNA was isolated and partial VP2 gene was amplified using gene specific primer pair Hfor/Hrev through PCR. Amplified fragments were cloned in pTZ57R/T (Fermentas) and completely sequenced. Sequences were analyzed and assembled by the Lasergene DNA analysis package (v8; DNAStar Inc., Madison, WI, USA).

Results: The results with immunochromatography showed that 33/40 (82%) of dogs were positive for CPV. We were able to amplify a fragment of 630 bp from 25 samples. In 25 samples the sequences of CPV-2a were detected showing the amino acid substitution Ser297Ala and presence of amino acid (426-Asn) in partial VP2 protein. Interestingly the BLAST analysis showed the of feline panleukopenia virus (FPV) sequences in 3 samples which were already positive for new CPV-2a, with 99% sequence homology to other FPV sequences present in GenBank.

Conclusions: Phylogenetic analysis showed clustering of partial CPV-VP-2 gene with viruses from China, India, Japan and Uruguay identifying a new variant, whereas the 3 FPV sequences showed immediate ancestral relationship with viruses from Portugal, South Africa and USA. Interesting observation was that CPV are clustering away from the commercial vaccine strains. In this work we provide a better understanding of CPV prevailing in Pakistan at molecular level. The detection of FPV could be a case of real co-infection or a case of dual presence, due to ingestion of contaminated food.

Keywords: Canine parvovirus; Coinfection; Feline panleukopenia virus; VP2 gene and phylogenetic analysis.

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Competing interests

The authors declare that they have no competing interests.

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Figures

Fig. 1
Fig. 1
Maximum likelihood tree depicting phylogenetic relationship between CPV and FPV isolates from Pakistan and other geographical locations. Parvoviruses obtained from dogs sequenced in this study are shown with red triangles. Isolates with pink color show (CPV) and bold green colors show (FPV). The vaccine strains are shown with black squares. Bootstrap values are shown next to the branches in the phylogenetic tree
See this image and copyright information in PMC

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