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Wei Y, Zeng Q, Gou H, Bao S. Update on feline calicivirus: viral evolution, pathogenesis, epidemiology, prevention and control. Front Microbiol 2024; 15:1388420. [PMID: 38756726 PMCID: PMC11096512 DOI: 10.3389/fmicb.2024.1388420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Accepted: 04/11/2024] [Indexed: 05/18/2024] Open
Abstract
Feline calicivirus (FCV) is a prevalent and impactful viral pathogen affecting domestic cats. As an RNA virus, FCV exhibits high mutability and genetic plasticity, enabling its persistence within cat populations. Viral genetic diversity is associated with a broad spectrum of clinical manifestations, ranging from asymptomatic infections and mild oral and upper respiratory tract diseases to the potential development of virulent systemic, and even fatal conditions. This diversity poses distinctive challenges in diagnosis, treatment, and prevention of diseases caused by FCV. Over the past four decades, research has significantly deepened understanding of this pathogen, with an emphasis on molecular biology, evolutionary dynamics, vaccine development, and disease management strategies. This review discusses various facets of FCV, including its genomic structure, evolution, innate immunity, pathogenesis, epidemiology, and approaches to disease management. FCV remains a complex and evolving concern in feline health, requiring continuous research to enhance understanding of its genetic diversity, to improve vaccine efficacy, and to explore novel treatment options.
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Affiliation(s)
| | | | - Huitian Gou
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Shijun Bao
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
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Jiang F, Liu Y, Yang X, Li Y, Huang J. Ultrasensitive and visual detection of Feline herpesvirus type-1 and Feline calicivirus using one-tube dRPA-Cas12a/Cas13a assay. BMC Vet Res 2024; 20:106. [PMID: 38493286 PMCID: PMC10943893 DOI: 10.1186/s12917-024-03953-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 02/23/2024] [Indexed: 03/18/2024] Open
Abstract
BACKGROUND Feline herpesvirus type 1 (FHV) and Feline calicivirus (FCV) are the primary co-infecting pathogens that cause upper respiratory tract disease in cats. However, there are currently no visual detection assays available for on-site testing. Here, we develop an ultrasensitive and visual detection method based on dual recombinase polymerase amplification (dRPA) reaction and the hybrid Cas12a/Cas13a trans-cleavage activities in a one-tube reaction system, referred to as one-tube dRPA-Cas12a/Cas13a assay. RESULTS The recombinant plasmid DNAs, crRNAs, and RPA oligonucleotides targeting the FCV ORF1 gene and FHV-1 TK gene were meticulously prepared. Subsequently, dual RPA reactions were performed followed by screening of essential reaction components for hybrid CRISPR-Cas12a (targeting the FHV-1 TK gene) and CRISPR-Cas13a (targeting the FCV ORF1 gene) trans-cleavage reaction. As a result, we successfully established an ultra-sensitive and visually detectable method for simultaneous detection of FCV and FHV-1 nucleic acids using dRPA and CRISPR/Cas-powered technology in one-tube reaction system. Visual readouts were displayed using either a fluorescence detector (Fluor-based assay) or lateral flow dipsticks (LDF-based assay). As expected, this optimized assay exhibited high specificity towards only FHV-1 and FCV without cross-reactivity with other feline pathogens while achieving accurate detection for both targets with limit of detection at 2.4 × 10- 1 copies/μL for the FHV-1 TK gene and 5.5 copies/μL for the FCV ORF1 gene, respectively. Furthermore, field detection was conducted using the dRPA-Cas12a/Cas13a assay and the reference real-time PCR methods for 56 clinical samples collected from cats with URTD. Comparatively, the results of Fluor-based assay were in exceptional concordance with the reference real-time PCR methods, resulting in high sensitivity (100% for both FHV-1 and FCV), specificity (100% for both FHV-1 and FCV), as well as consistency (Kappa values were 1.00 for FHV-1 and FCV). However, several discordant results for FHV-1 detection were observed by LDF-based assay, which suggests its prudent use and interpretaion for clinical detection. In spite of this, incorporating dRPA-Cas12a/Cas13a assay and visual readouts will facilitate rapid and accurate detection of FHV-1 and FCV in resource-limited settings. CONCLUSIONS The one-tube dRPA-Cas12a/Cas13a assay enables simultaneously ultrasensitive and visual detection of FHV-1 and FCV with user-friendly modality, providing unparalleled convenience for FHV-1 and FCV co-infection surveillance and decision-making of URTD management.
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Affiliation(s)
- Fumei Jiang
- Key Laboratory of Animal Medicine, Southwest Minzu University, Chengdu City, Sichuan Province, China
| | - Yunjia Liu
- Key Laboratory of Animal Medicine, Southwest Minzu University, Chengdu City, Sichuan Province, China
| | - Xiaonong Yang
- Key Laboratory of Animal Medicine, Southwest Minzu University, Chengdu City, Sichuan Province, China
| | - Yan Li
- Key Laboratory of Animal Medicine, Southwest Minzu University, Chengdu City, Sichuan Province, China.
- Department of Clinical Veterinary Medicine, College of Animal Science and Veterinary Medicine, Southwest Minzu University, No. 16, South 4th Section, 1st-Ring Road, Wuhou, Chengdu, Sichuan, 610041, China.
| | - Jian Huang
- Key Laboratory of Animal Medicine, Southwest Minzu University, Chengdu City, Sichuan Province, China.
- Veterinary Teaching Hospital, Southwest Minzu University, Chengdu, China.
- Department of Clinical Veterinary Medicine, College of Animal Science and Veterinary Medicine, Southwest Minzu University, No. 16, South 4th Section, 1st-Ring Road, Wuhou, Chengdu, Sichuan, 610041, China.
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Yeo YG, Kim HR, Park J, Kim JM, Shin YK, Lee KK, Kwon OK, Jeoung HY, Kang HE, Ku BK, Park SC, Kwon OD, Park CK. Epidemiological and Molecular Approaches for a Fatal Feline Panleukopenia Virus Infection of Captive Siberian Tigers ( Panthera tigris altaica) in the Republic of Korea. Animals (Basel) 2023; 13:2991. [PMID: 37760391 PMCID: PMC10526094 DOI: 10.3390/ani13182991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 09/13/2023] [Accepted: 09/17/2023] [Indexed: 09/29/2023] Open
Abstract
Feline panleukopenia virus (FPV), a member of the species Protoparvovirus carnivoran1, is one of the most fatal pathogens of domestic and wild carnivores. The virus endemically infects domestic carnivores worldwide and its cross-species transmission threatens endangered wild carnivores, including Siberian tigers. In this study, a fatal FPV infection in endangered Siberian tigers was investigated to trace the origin of the virus and elucidate the reason behind FPV's infection of the vaccinated tigers. Our genetic characterization and phylogenetic analysis revealed that the virus detected in the infected tigers, designated as the KTPV-2305 strain, was closely related to FPV strains circulating in Korean cats, suggesting that it might have been transmitted from stray cats wandering around the zoo. Compared with the prototype FPV reference strains, the KTPV-2305 strain carried three distinct amino acid (aa) mutations in the VP2 protein sequence (I101T, I232V, and L562V) in this study. These three mutations are commonly found in most global FPV strains, including Korean strains, indicating that these mutations are common evolutionary characteristics of currently circulating global FPVs. The reason why the vaccinated tigers were infected with FPV was most likely the insufficient protective immunity of the affected tigress or vaccine failure triggered by the interference of maternal-derived antibodies in the affected tiger cubs. These findings suggest that improved vaccination guidelines are urgently needed to save the lives of wild carnivores from this fatal virus.
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Affiliation(s)
- Yong-Gu Yeo
- College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea; (Y.-G.Y.); (H.-R.K.); (J.-M.K.)
- Seoul Zoo, Gwacheon 13829, Republic of Korea
| | - Hye-Ryung Kim
- College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea; (Y.-G.Y.); (H.-R.K.); (J.-M.K.)
| | - Jonghyun Park
- Laboratory of Veterinary Pharmacokinetics and Pharmacodynamics, College of Veterinary Medicine and Cardiovascular Research Institute, Kyungpook National University, Daegu 41566, Republic of Korea; (J.P.); (S.-C.P.)
| | - Jong-Min Kim
- College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea; (Y.-G.Y.); (H.-R.K.); (J.-M.K.)
| | - Yeun-Kyung Shin
- Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea; (Y.-K.S.); (K.-K.L.); (O.-K.K.); (H.-Y.J.); (H.-E.K.); (B.-K.K.)
| | - Kyoung-Ki Lee
- Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea; (Y.-K.S.); (K.-K.L.); (O.-K.K.); (H.-Y.J.); (H.-E.K.); (B.-K.K.)
| | - Oh-Kyu Kwon
- Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea; (Y.-K.S.); (K.-K.L.); (O.-K.K.); (H.-Y.J.); (H.-E.K.); (B.-K.K.)
| | - Hye-Young Jeoung
- Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea; (Y.-K.S.); (K.-K.L.); (O.-K.K.); (H.-Y.J.); (H.-E.K.); (B.-K.K.)
| | - Hae-Eun Kang
- Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea; (Y.-K.S.); (K.-K.L.); (O.-K.K.); (H.-Y.J.); (H.-E.K.); (B.-K.K.)
| | - Bok-Kyung Ku
- Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea; (Y.-K.S.); (K.-K.L.); (O.-K.K.); (H.-Y.J.); (H.-E.K.); (B.-K.K.)
| | - Seung-Chun Park
- Laboratory of Veterinary Pharmacokinetics and Pharmacodynamics, College of Veterinary Medicine and Cardiovascular Research Institute, Kyungpook National University, Daegu 41566, Republic of Korea; (J.P.); (S.-C.P.)
| | - Oh-Deog Kwon
- College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea; (Y.-G.Y.); (H.-R.K.); (J.-M.K.)
| | - Choi-Kyu Park
- College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea; (Y.-G.Y.); (H.-R.K.); (J.-M.K.)
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Xue H, Liang Y, Gao X, Song Y, Zhu K, Yang M, Hao J, Ma H, Yu K. Development and Application of nanoPCR Method for Detection of Feline Panleukopenia Virus. Vet Sci 2023; 10:440. [PMID: 37505845 PMCID: PMC10386105 DOI: 10.3390/vetsci10070440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 06/27/2023] [Accepted: 07/03/2023] [Indexed: 07/29/2023] Open
Abstract
Feline panleukopenia (FP) is a severe viral illness caused by the feline panleukopenia virus (FPV), putting sectors like companion cat breeding and endangered feline conservation at risk. The virus has a high morbidity and fatality rate and is found all over the world. We created a novel FPV assay using nanoPCR technology and assessed the method's specificity and sensitivity. The approach amplified a 345 bp nucleic acid fragment with a minimum detection limit of 7.97 × 102 copies/μL, which is about 100 times greater than traditional PCR. We collected anal swabs from 83 cats suspected of FPV infection for practical application, and the FPV-positive rate determined by the nanoPCR approach was 77.1%. In conclusion, the approach is more sensitive than conventional PCR and more convenient and cost-effective than qPCR methodology and may be utilized for the clinical detection of FPV.
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Affiliation(s)
- Haowen Xue
- Laboratory for Animal Molecular Virology, Department of Veterinary Medicine, College of Agricultural, Yanbian University, Yanji 133002, China
| | - Yang Liang
- Beijing Shengzetang Animal Hospital, Beijing 102218, China
| | - Xu Gao
- Laboratory for Animal Molecular Virology, Department of Veterinary Medicine, College of Agricultural, Yanbian University, Yanji 133002, China
| | - Yanhao Song
- Laboratory for Animal Molecular Virology, Department of Veterinary Medicine, College of Agricultural, Yanbian University, Yanji 133002, China
| | - Kunru Zhu
- Laboratory for Animal Molecular Virology, Department of Veterinary Medicine, College of Agricultural, Yanbian University, Yanji 133002, China
| | - Meng Yang
- Laboratory for Animal Molecular Virology, Department of Veterinary Medicine, College of Agricultural, Yanbian University, Yanji 133002, China
| | - Jingrui Hao
- Laboratory for Animal Molecular Virology, Department of Veterinary Medicine, College of Agricultural, Yanbian University, Yanji 133002, China
| | - Haoyuan Ma
- Laboratory for Animal Molecular Virology, Department of Veterinary Medicine, College of Agricultural, Yanbian University, Yanji 133002, China
| | - Kai Yu
- Laboratory for Animal Molecular Virology, Department of Veterinary Medicine, College of Agricultural, Yanbian University, Yanji 133002, China
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Sun A, Wang L, Zhang Y, Yang X, Wei Y, Yang D, Li W, Wu X. Establishment of a triplex TaqMan quantitative real-time PCR assay for simultaneous detection of Cymbidium mosaic virus, Odontoglossum ringspot virus and Cymbidium ringspot virus. Front Microbiol 2023; 14:1129259. [PMID: 37275143 PMCID: PMC10235546 DOI: 10.3389/fmicb.2023.1129259] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Accepted: 05/08/2023] [Indexed: 06/07/2023] Open
Abstract
Orchids are significant ornamental plants whose viral infection results in substantial economic damage. Cymbidium mosaic virus (CymMV), Odontoglossum ringspot virus (ORSV), and Cymbidium ringspot virus (CymRSV) represent three important and prevalent orchid viruses. The detection system proposed in this study uses a triplex TaqMan quantitative real-time PCR assay to identify CymMV, ORSV, and CymRSV in a simultaneous manner. We designed specific primers and probes for CymMV, ORSV, and CymRSV, with amplified sequences of 156 bp, 148 bp, and 145 bp, respectively. The minimum detection limit of the triplex qRT-PCR assay for CymMV and CymRSV was 1 copy/assay, and the minimum detection limit was 10 copies/assay for ORSV. The minimum stable detection limits for CymMV, ORSV, and CymRSV were 10, 102, and 102 copies/assay, respectively. Therefore, this system exhibited higher sensitivity (approximately 10 to 104-fold) than RT-PCR. The intra-and interassay CVs of Cq values are less than 0.55 and 0.95%, respectively, indicating that the triplex assay is highly reliable and accurate. In addition, 66 samples from five different orchid genera were analyzed using the established assay and gene chip. The detection results demonstrated that the triplex probe qRT-PCR demonstrated higher sensitivity than the gene chip, indicating that the triplex real-time PCR assay could be used for the detection of field samples. Our findings suggest that the triplex real-time RT-PCR detection system represents a rapid, simple, and accurate tool for detecting CymMV, ORSV, and CymRSV on orchids.
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Affiliation(s)
- Aiqing Sun
- Flower Research Institute, Yunnan Agriculture Academy of Science Kunming, Kunming, Yunnan, China
- Yunnan University, Kunming, Yunnan, China
| | - Lihua Wang
- Flower Research Institute, Yunnan Agriculture Academy of Science Kunming, Kunming, Yunnan, China
| | - Yiping Zhang
- Flower Research Institute, Yunnan Agriculture Academy of Science Kunming, Kunming, Yunnan, China
| | - Xiumei Yang
- Flower Research Institute, Yunnan Agriculture Academy of Science Kunming, Kunming, Yunnan, China
| | - Yi Wei
- Yunnan University, Kunming, Yunnan, China
| | - Dong Yang
- Yunnan University, Kunming, Yunnan, China
| | - Wenhan Li
- Yunnan University, Kunming, Yunnan, China
| | - Xuewei Wu
- Yunnan University, Kunming, Yunnan, China
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Chen B, Zhang H, Wang H, Li S, Zhou P. Development and application of a dual ERA method for the detection of Feline Calicivirus and Feline Herpesvirus Type I. Virol J 2023; 20:62. [PMID: 37020252 PMCID: PMC10077619 DOI: 10.1186/s12985-023-02020-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Accepted: 03/23/2023] [Indexed: 04/07/2023] Open
Abstract
Feline calicivirus (FCV) and feline herpesvirus type I (FHV-1) are the most common viral pathogens responsible for cat respiratory diseases, and coinfection with these two pathogens is often found. In veterinary clinics, the main diagnostic methods for FCV and FHV-1 are test strips and polymerase chain reaction (PCR). However, the sensitivity of test strips are not sufficient, and PCR is time-consuming. Therefore, developing a rapid and high-performance clinical diagnostic test is imperative for the prevention and treatment of these diseases. Enzymatic recombinase amplification (ERA) is an automated isothermal nucleic acid amplification technique that maintains a constant temperature, and is both rapid and highly accurate. In this study, a dual ERA method was developed using the Exo probe for a differential detection of FCV and FHV-1. This dual ERA method demonstrated high performance with the detection limit of 101 copies for both viruses, and no cross-reactions with feline parvovirus virus and F81 cells. To test the utility of the method for clinical applications, 50 nasopharyngeal swabs from cats with respiratory symptoms were collected and tested. The positive rates of FCV and FHV-1 were 40% (20/50, 95% confidence interval [CI], 26.4 to 54.8%) and 14% (7/50, 95% CI, 5.8 to 26.7%), respectively. The rate of coinfection with FCV and FHV-1 was 10% (5/50, 95% CI, 3.3 to 21.8%). These results were in agreement with those found using quantitative real-time PCR. Therefore, this dual ERA method is a novel and efficient clinical diagnostic tool for FCV and FHV-1 detection.
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Affiliation(s)
- Bo Chen
- Guangdong Provincial Pet Engineering Technology Research Center, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, Guangdong Province, People's Republic of China
| | - Haoyang Zhang
- Guangdong Provincial Pet Engineering Technology Research Center, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, Guangdong Province, People's Republic of China
| | - Hanhong Wang
- Guangdong Provincial Pet Engineering Technology Research Center, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, Guangdong Province, People's Republic of China
| | - Shoujun Li
- Guangdong Provincial Pet Engineering Technology Research Center, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, Guangdong Province, People's Republic of China
| | - Pei Zhou
- Guangdong Provincial Pet Engineering Technology Research Center, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, Guangdong Province, People's Republic of China.
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, Guangdong Province, People's Republic of China.
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Xiao X, Hao X, Chen B, Zhou P, Li S. Two Multiplex PCR Methods for Detecting Several Pathogens Associated with Feline Respiratory and Intestinal Tracts. Vet Sci 2022; 10:vetsci10010014. [PMID: 36669015 PMCID: PMC9867166 DOI: 10.3390/vetsci10010014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 12/22/2022] [Accepted: 12/24/2022] [Indexed: 12/28/2022] Open
Abstract
Respiratory tract and intestinal diseases are common threats to feline health. Coinfection with multiple pathogens is not rare among clinical infectious cases. Rapid diagnosis of these coinfections is of great significance for timely and effective clinical treatment. In this study, two novel multiplex polymerase chain reactions (mPCRs) were established for simultaneous detection of four pathogens associated with the feline intestinal tract (feline coronavirus (FCoV), feline astrovirus (FeAstV), feline panleukopenia virus (FPV) and feline kobuvirus (FeKoV)) and five pathogens associated with the respiratory tract (feline calicivirus (FCV), feline herpesvirus 1 (FHV-1), feline leukemia virus (FeLV), Chlamydia felis (C. felis) and influenza A virus (IAV)). The results of sensitivity analysis revealed that the detection limits for FeKoV, FPV, FeAstV, FCoV, IAV, C. felis, FeLV, FHV-1 and FCV were 103, 104, 103, 103, 103, 104, 104, 105 and 105 copies/µL, respectively. Moreover, the specificity of the two mPCRs was high. When the two mPCRs were applied to clinical samples, the assay worked well. In conclusion, we established two mPCR methods that provide an excellent tool for the diagnosis and monitoring of pathogens associated with the feline respiratory and intestinal tracts.
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Affiliation(s)
- Xiangyu Xiao
- Guangdong Provincial Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pets, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Xiangqi Hao
- Guangdong Provincial Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pets, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Bo Chen
- Guangdong Provincial Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pets, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Pei Zhou
- Guangdong Provincial Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pets, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Correspondence: (P.Z.); (S.L.)
| | - Shoujun Li
- Guangdong Provincial Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pets, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Correspondence: (P.Z.); (S.L.)
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A Retrospective Study of Viral Molecular Prevalences in Cats in Southern Italy (Campania Region). Viruses 2022; 14:v14112583. [PMID: 36423192 PMCID: PMC9699332 DOI: 10.3390/v14112583] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/16/2022] [Accepted: 11/18/2022] [Indexed: 11/23/2022] Open
Abstract
From 2019 to 2021, a retrospective molecular study was conducted in the Campania region (southern Italy) to determine the prevalence of viral diseases in domestic cats. A total of 328 dead animals were analyzed by Real-Time PCR for the presence of feline panleukopenia virus (FPV), feline leukemia virus (FeLV), feline enteric coronavirus (FCoV), rotavirus (RVA), feline herpesvirus type 1 (FHV-1), and feline calicivirus (FCV). The possible presence of SARS-CoV-2 was also investigated by Real-Time PCR. The cats included in this study were specifically sourced and referred by local veterinarians and local authorities to the Zooprofilactic Experimental Institute of Southern Italy (IZSM) for pathological evaluation. The samples consisted of owners, catteries, and stray cats. Results revealed: 73.5% positive cats for FPV (189/257), 23.6% for FeLV (21/89), 21.5% for FCoV (56/266), 11.4% for RVA (16/140), 9.05% for FeHV-1 (21/232), and 7.04 for FCV (15/213). In contrast, SARS-CoV-2 was never detected. FPV was more prevalent in winter (p = 0.0027). FCoV FHV-1, FCV, and RVA predominated in autumn, whereas FeLV predominated in summer. As expected, viral infections were found more frequently in outdoor and shelter cats than in indoor ones, although no statistical association was found between animal lifestyle and viral presence. The study showed a high prevalence of FPV, FeLV, and FCoV and a moderate prevalence of RVA, FHV-1, and FCV. Moreover, the prevalence of these pathogens varied among the cat populations investigated.
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Huang J, Liu Y, He Y, Yang X, Li Y. CRISPR-Cas13a Based Visual Detection Assays for Feline Calicivirus Circulating in Southwest China. Front Vet Sci 2022; 9:913780. [PMID: 35898546 PMCID: PMC9310557 DOI: 10.3389/fvets.2022.913780] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 05/24/2022] [Indexed: 11/30/2022] Open
Abstract
Feline calicivirus (FCV) is a well-known causative pathogen for upper respiratory infection in cats. Its high genetic variability challenges existing molecular diagnostic methods in clinical settings. Thus, we developed two sensitive and visual assays for FCV nucleic acid detection based on RPA reaction and CRISPR-Cas13a trans-cleavage activity. Recombinant plasmid DNA, crRNAs, and RPA primers were designed and prepared, respectively, targeting to FCV ORF1 gene. Besides, purified LwCas13a protein was produced by E.coli prokaryotic expression system. To confirm the validity of FCV-Cas13a assays, seven reaction systems (RSs) with different components were tested, and visual readouts were displayed by lateral flow dipstick (FCV-Cas13a-LFD) and fluorescence detector (FCV-Cas13a-FLUOR), respectively. The established FCV-Cas13a assays were capable of detecting FCV nucleic acid in presetting RSs without cross-reaction with other feline-associated pathogens, and the detection limit was as low as 5.5 copies/μl for both visual methods. Moreover, the positive rate of 56 clinical specimens detected by FCV-Cas13a assays (67.9%, 38/56) was notably higher than that of RT-qPCR (44.6%, 25/56) (p < 0.001), including 13 presumptive positive specimens. Taken together, FCV-Cas13a assays provided reliable and visual diagnostic alternatives for FCV field detection.
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Affiliation(s)
- Jian Huang
- Department of Veterinary Medicine, College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu, China
- Veterinary Teaching Hospital of Southwest Minzu University, Chengdu, China
| | - Yunjia Liu
- Veterinary Teaching Hospital of Southwest Minzu University, Chengdu, China
| | - Yuwei He
- Veterinary Teaching Hospital of Southwest Minzu University, Chengdu, China
| | - Xiaonong Yang
- Department of Veterinary Medicine, College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu, China
- Veterinary Teaching Hospital of Southwest Minzu University, Chengdu, China
| | - Yan Li
- Department of Veterinary Medicine, College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu, China
- Veterinary Teaching Hospital of Southwest Minzu University, Chengdu, China
- *Correspondence: Yan Li
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