Canine bufavirus (CBuV), a novel protoparvovirus of dogs that is associated with enteric and respiratory symptoms, has been reported only in Italy and China. The enteric prevalence of CBuV in India was investigated, and the nearly complete genome sequence (4292 bp) was amplified and reconstructed for one strain. A nucleotide sequence alignment indicated 93.42–98.81% identity to the other available CBuV sequences and 70.88–73.39% and 54.4–54.8% identity to human bufavirus and canine parvovirus 2 (CPV-2), respectively. The current strain is most closely related to Chinese CBuV strains, which together form an Asian lineage. This first report of the prevalence of CBuV in India emphasizes the need for further epidemiological surveillance. Supplementary Information The online version contains supplementary material available at 10.1007/s00705-022-05398-7.

Canine adenovirus (CAV) circulates as two distinct serotypes, CAV-1 and CAV-2, which are antigenically related but differ in their clinical manifestations. CAV is one of the important viral agents in the etiology of canine gastroenteritis. Here, we report the molecular surveillance and genetic characterization of CAV from clinical cases of canine gastroenteritis. A total of 302 fecal/rectal swabs were collected from dogs presented with gastroenteritis at various clinics in and around Hyderabad, India during 2018-19. These samples were tested for CAV using polymerase chain reaction with primers designed for the CAV E3 gene and the virus was isolated from positive samples. CAV-2 nucleic acid was present in 4.9% of the test samples. The partial sequence analyses of the E3 gene of the CAV-2 isolates revealed a frameshift mutation by insertion of nucleotide "G" at 1077 position of E3 gene, which resulted in an extension of the polypeptide chain by eleven amino acids. As a result, isolates from the current study formed a novel group, and the virus that was previously subdivided into two groups worldwide is now categorized under three. The study identifies a novel group of CAV-2 circulating in India providing an updated information regarding CAV-2.

Viral pathogens are the primary cause of canine gastroenteritis. However, few structured comprehensive studies on the viral etiology of canine gastroenteritis have been conducted. In this study, 475 rectal swabs collected over three years (2018-2021) from clinical canine gastroenteritis cases were screened for the presence of six major enteric viruses – canine parvovirus 2 (CPV-2), canine distemper virus (CDV), canine adenovirus 2 (CAdV-2), canine coronavirus (CCoV), canine astrovirus (CaAstV), and canine rotavirus (CRV) – by real-time PCR. The most frequently detected virus was CPV-2, which was present in 64.8% of the samples (subtype 2a, 21.1%; 2b, 77.4%; 2c, 1.5%), followed by CDV (8%), CaAstV (7.2%), CCoV (5.9%), and CAdV-2 (4.6%). Two to four of these viruses in different combinations were found in 16.8% of the samples, and CRV was not detected. The complete genome sequences of Indian isolates of CDV, CCoV, and CaAstV were determined for the first time, and phylogenetic analysis was performed. This study highlights the need for routine prophylactic vaccination with the appropriate vaccines. Notably, 70.3% of animals vaccinated with DHPPiL were found to be positive for at least one virus. Hence, regular molecular analysis of the prevalent viruses is crucial for addressing vaccination failures. Supplementary Information The online version contains supplementary material available at 10.1007/s00705-022-05674-6.

<b><i>Introduction:</i></b> Bluetongue disease is an economically important viral disease of livestock caused by bluetongue virus (BTV) having multiple serotypes. It belongs to the genus <i>Orbivirus</i> of family Reoviridae and subfamily Sedoreovirinae. The genome of BTV is 10 segmented dsRNA that codes for 7 structural and 4 nonstructural proteins, of which VP2 was reported to be serotype-specific and a major antigenic determinant. <b><i>Objective:</i></b> It is important to know the circulating serotypes in a particular geographical location for effective control of the disease. The present study unravels the molecular evolution of the circulating BTV serotypes during 2014–2018 in Telangana and Andhra Pradesh states of India. <b><i>Methods:</i></b> Multiple sequence alignment with available BTV serotypes in GenBank and phylogenetic analysis were performed for the partial VP2 sequences of major circulating BTV serotypes during the study period. <b><i>Results:</i></b> The multiple sequence alignment of circulating serotypes with respective reference isolates revealed variations in antigenic VP2. The phylogenetic analysis revealed that the major circulating serotypes were grouped into eastern topotypes (BTV-1, BTV-2, BTV-4, and BTV-16) and Western topotypes (BTV-5, BTV-12, and BTV-24). <b><i>Conclusion:</i></b> Our study strengthens the need for development of an effective vaccine, which can induce the immune response for a range of serotypes within and in between topotypes.

Viral pathogens account for major aetiology of canine gastroenteritis in India. However, till date, there was no structured comprehensive study reported on the viral aetiology of canine gastroenteritis in India. To elucidate this, 475 rectal swabs collected over a period of three years (2018-2021) from clinical canine gastroenteritis cases were screened by real-time PCR for the presence of six majorly known enteric viruses (Canine parvovirus -2 (CPV-2), canine distemper virus (CDV), canine adenovirus-2 (CAdV-2), canine corona virus (CCoV), canine astrovirus (CaAstV), canine rotavirus (CRV)). 71.6% of the samples were found to harbour at least one of the five viruses tested (CPV-2/2a/2b/2c, CDV, CAdV-2, CCoV and CaAstV), whereas, there was no evidence of CRV. The overall incidence rate for each virus was found highest at 64.8% for CPV-2/2a/2b/2c (2a: 21.1%, 2b: 77.4%, 2c: 1.5%), followed by 8% for CDV, 7.2% for CaAstV, 5.9% for CCoV and 4.6% for CAdV-2 with 16.8% incidence for coinfections ranging from two to four viruses in different combinations. Further, for the first time we report the whole genome sequences of CDV, CCoV and CaAstV Indian isolates from canine gastroenteritis cases. Phylogenetic analysis of whole genome revealed that CDV clustered with Asia-1 lineage, CaAstV clustered with group III that consists of China and Brazil isolates, and CCoV clustered with group II that consists of China and Taipei isolates. This study adds to our knowledge on the prevalence of these pathogens in the Indian subcontinent and highlights the need for relevant and routine vaccine prophylactic measures. It is alarming to note that 70.3% of animals vaccinated with DHPPIL were found positive for at least one virus. Hence, regular molecular analysis of the prevalent viruses is crucial to address vaccination failures.