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Canis distemper virus (CDV) belongs to the Paramyxoviridae family and Morbillivirus genus in classification, and is a single stranded RNA virus. At room temperature, the virus is relatively unstable, especially sensitive to ultraviolet radiation, dryness, and high temperatures above 50-60 ℃ (122-140 ℉). Under freezing conditions, the virus can survive for several weeks. Most conventional disinfections can kill CDV.
Figure 1. Structure of Canine Distemper Virus. (Rivera-Martínez A,et al, 2024)
CDV is the oldest and most clinically significant virus that infects dogs. The natural hosts of infection are canids and weasels, mainly transmitted through air and droplet levels. Sick dogs are an important source of infection, and through long-term detoxification through urine, they contaminate the surrounding environment. Dogs of different ages, genders, and breeds can all be infected, and sick dogs are the most important source of infection. They can detoxify their urine for a long time and pollute the surrounding environment. The symptoms of CDV infection are diverse and related to virus virulence, environmental conditions, host age, and immune status. They can be mainly divided into five characteristic types: hyperacute, acute, gastrointestinal symptoms, neurological symptoms, and skin symptoms. Once characteristic symptoms appear, the prognosis is extremely poor. CDV infection types are complex and diverse, making clinical diagnosis difficult and easily confused with upper respiratory tract infections, canine infectious hepatitis, canine coronavirus infections, etc.
Figure 2. CDV infection cycle. (Rivera-Martínez A,et al, 2024)
The initial infection of CDV begins with the virus invading the epithelial cells of the upper respiratory tract. The virus quickly spreads to local lymphoid tissue, tonsils, and bronchial lymph nodes. Subsequently, CDV will spread to the epithelial tissue and central nervous system within the first week of infection. The humoral immune response after infection is related to virus clearance. Dogs recovering from acute CDV infection are likely to gain immunity for several years. Dogs without effective immunity can quickly spread the virus to the skin, endocrine glands, digestive tract, respiratory tract, and urogenital tract after infection.
The blood changes in dogs infected with experimental CDV include lymphocyte proliferation, thrombocytopenia, and aplastic anemia, but they are not common in clinical cases. Occasionally, inclusion bodies can be found in the cells of blood smears (especially lymphocytes and occasionally neutrophils) during acute infections. The examination of the buffy coat smear and bone marrow extract can also reveal intracellular inclusions, increasing the chances of detecting canine distemper. In addition, canine distemper inclusion bodies can also be detected from conjunctival epithelial cells. Modern diagnostics heavily utilize Anti-Canine Distemper Virus monoclonal antibodies in antigen-capture ELISA or immunochromatographic rapid tests for direct viral detection in clinical samples, and in immunohistochemistry for definitive tissue diagnosis. Simultaneously, serological profiling employs the Recombinant Canine Distemper Virus F Antigen in ELISA formats to accurately distinguish between IgM (suggesting recent infection) and IgG antibodies, providing a critical assessment of the host's immune response and infection stage with high specificity.
The severity and varied clinical manifestations of canine distemper result from complex virus-host interactions at the molecular level. CDV employs sophisticated strategies to enter cells, replicate, and, crucially, subvert the host's immune defenses. Key pathological processes hinge on specific viral proteins, host cell receptors, and the disruption of innate immune signaling pathways. The following table summarizes the key molecular targets and genes central to CDV pathogenesis:
| Category | Target/Gene | Role in CDV Pathogenesis | Key Insights from Research |
| Viral Entry & Tropism | Hemagglutinin (H) Protein | Binds to host cell receptors (SLAM, Nectin-4), major antigen for immune recognition and neutralization. | High mutation rate leads to genetic lineages, specific mutations can alter receptor affinity and host adaptation. |
| Fusion (F) Protein | Mediates viral and host cell membrane fusion after H protein binds to the receptor. | The Fsp-coding region is highly variable and useful for phylogenetic studies. | |
| Host Receptor: SLAM (CD150) | Primary receptor on immune cells (lymphocytes, macrophages, dendritic cells). | Binding to SLAM enables initial lymphocytic infection and systemic immunosuppression. | |
| Immune Evasion | Viral V Protein | Key interferon (IFN) antagonist. Binds to and blocks nuclear import of STAT1 and STAT2 transcription factors, crippling the IFN-α/β signaling cascade. | This allows the virus to evade the host's primary antiviral defense system, a major virulence mechanism. |
| Host Immune Response | Type I IFN Pathway Genes | IRF7, STAT1, STAT2, MX1, PKR are significantly upregulated during CNS infection. | Represents the host's attempt to establish an antiviral state, strong expression in microglia may contribute to bystander demyelination. |
| Pattern Recognition Receptors | Toll-like Receptors (TLRs), show altered expression during infection. | Part of the initial detection system for viral RNA, dysregulation is linked to disease progression. |
The clinical symptoms of CDV infection vary in severity depending on the virus species, environmental factors, and individual response to infection. The clinical symptoms are mainly limited to the upper respiratory tract, so coughing and runny nose will be very obvious. Uninfected puppies are likely to experience severe symptoms such as pneumonia, diarrhea, dehydration, and loss of appetite. Vomiting often occurs in the early stages of infection. If puppies are also infected with intestinal parasites, they may also develop intussusception. Neurological symptoms appear 1-3 weeks after recovery from acute infection. The neurological symptoms caused by CDV have a significant progressive nature and eventually deteriorate rapidly. Dogs with neurological symptoms, if able to survive, may also have permanent sequelae.
The CDV highly efficient attenuated vaccine has been applied in the market for many years, with a good safety record. Its high efficacy is reflected in the zero infection rate of canine distemper in immunized dogs. Most manufacturers recommend immunizing dogs 3 times at 8-16 weeks. After the initial immunization, the immunity can last for 3 to 5 years. Dogs that recover from natural infections can have immunity for several years. The early concern that dogs immune to both parvovirus and canine distemper may develop encephalitis has not been confirmed. Administering two antigens to the same dog does not pose a definite risk. There is a canine distemper measles vaccine available for dogs, which provides protection for puppies with high concentrations of canine distemper maternal antibodies. However, this vaccine is recommended only for puppies as it cannot be confirmed that all puppies have consumed colostrum.
Reference
| Target | Cat. No. | Product Name | Host | Isotype | Application | |
| Mev | CABT-BL8819 | Anti-Canine Distemper Virus monoclonal antibody, clone 2C1 | Mouse | / | ELISA, LFIA, WB | Inquiry |
| CABT-BL8820 | Anti-Canine Distemper Virus monoclonal antibody, clone 2C2 | Mouse | / | ELISA, LFIA, WB | Inquiry |
| Target | Cat. No. | Product Name | Host | |
| CPV | DAG-WT5866 | Canine parvovirus (CPV) Stock (Qualitative) | N/A | Inquiry |
| CDV | DAG-WT1035 | Recombinant Canine Distemper Virus N Antigen | E. coli | Inquiry |
| DAG-WT1036 | Recombinant Canine Distemper Virus H Antigen | E. coli | Inquiry | |
| DAG-WT3817 | Recombinant Canine Distemper Virus F Antigen | E. coli | Inquiry | |
| DAG-WT5865 | Canine Distemper virus (CDV) Stock (Qualitative) | N/A | Inquiry |
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