Sapovirus is a single stranded positive stranded RNA virus of the Caliphaviridae family, first discovered in 1977 during a diarrhea outbreak in Sapporo daycare centers in Japan. It has a hexagonal structure with a diameter of 30 38 nm. This virus can cause acute gastroenteritis in people of all ages, with main symptoms including nausea, vomiting, abdominal pain, and diarrhea. Children mainly experience vomiting, while adults are more likely to experience diarrhea. The transmission routes include fecal oral transmission, contact with pollutants, and aerosol transmission. Laboratory diagnosis mainly relies on reverse transcription polymerase chain reaction.
Figure 1. Age profiles of 52 sapovirus-positive children with and without co-infection. (Moraes, Marcia Terezinha Baroni de, et al.2021)
Sapovirus is transmitted through fecal oral route. Infected individuals excrete a large amount of particles/gram of feces or vomit. The particles of infected individuals can survive for several years, and the infection dose may be as low as 10 particles. Pollution on work surfaces, hands, etc. can lead to a large number of new infections. Infection occurs through the fecal oral route. Other forms of transmission include infected individuals mishandling food (most commonly in restaurant environments), consuming shellfish living in water contaminated with infected feces, and ingesting contaminated water.
| Virological characteristics | Details |
| Structural characteristics | An enveloped icosahedral virus particle with a typical cup-shaped depression on its surface, exhibiting hexagonal star morphology under electron microscopy |
| Genetic characteristics | The genome is approximately 7.5kb in length and contains 3 open reading frames. It is classified into 5 genotypes based on differences in capsid protein genes |
| Host range | G III type mainly infects pigs, while other genotypes can infect humans |
After a incubation period of 1-4 days, signs of the disease begin to appear. The symptoms of sapovirus are very similar to those of Norovirus. The most common symptoms are vomiting and diarrhea. However, other symptoms may occur, including chills, nausea, headache, abdominal cramps, muscle pain, and fever, although this condition is very rare. Although patients often experience symptoms after a incubation period of 1-4 days, there are also some patients who do not have symptoms. Although individuals do not exhibit symptoms, they can still transmit the virus through the general mode of oral and fecal transmission.
The lack of specific treatments underscores the importance of identifying and characterizing molecular targets for antiviral therapy. Key viral components and host factors involved in the sapovirus life cycle present promising opportunities for intervention.
| Target | Function | Therapeutic Approach |
| RNA-dependent RNA Polymerase (RdRp) | Viral genome replication | Nucleoside analogues, non-nucleoside inhibitors |
| VPg Protein | Genome-linked protein; hijacks host translation | Disrupt VPg-eIF4E interaction |
| eIF4E | Host translation initiation factor | Small molecule inhibitors of VPg-eIF4E binding |
| Protease | Processes viral polyprotein | Protease inhibitors |
| Capsid Protein (VP1) | Viral structure and assembly | Capsid assembly inhibitors; vaccine candidate |
General hygiene is the most important method for preventing sapovirus. This can be achieved by thoroughly washing hands after using the bathroom and before eating/preparing food. Alcohol based hand sanitizer is ineffective against the Sapovirus virus. Disinfectants or solutions containing bleach should be used to clean contaminated surfaces. Other preventive measures include avoiding contact and sharing drinks/food with infected individuals.
| Virological characteristics | Details |
| Nucleic acid testing method | Reverse transcription polymerase chain reaction (RT-PCR) has become the most commonly used tool for detecting sapovirus due to its wide reactivity, sensitivity, speed, and specificity. Due to the diversity of sapovirus, hundreds of primers have been designed to specifically target and amplify RNA dependent RNA polymerases. |
| Virus particle detection | Through the typical surface morphology of the "Star of David" under an electron microscope, sapovirus can be distinguished morphologically from other gastrointestinal pathogens such as norovirus, rotavirus, astrovirus, or adenovirus. However, compared to nucleic acid detection methods, its sensitivity is lower. |
| Antigen detection method | Enzyme linked immunosorbent assay (ELISA) has been used to detect human Sapovirus in clinical samples. Although ELISA can be used to detect human salivary virus antigens, it is not commonly used. The diversity of many strains of sapovirus makes it difficult to detect the various antigens that may be present. Due to the presence of so many possible antigens, ELISA is not as accurate or sensitive as nucleic acid detection methods. |
The sapovirus virus is the leading cause of acute gastroenteritis worldwide and has a significant impact on public health, especially for vulnerable populations. Its unique genomic organization, dependence on HBGA entering host cells, and conservative replication mechanism have identified multiple molecular targets for diagnosis and treatment. Although supportive care remains the primary treatment method, advances in vaccine development (such as VLPs) and antiviral drug design (such as receptor inhibitors, protease inhibitors) provide hope for improving prevention and control. Continuing to study the biology and epidemiology of sapovirus is crucial for addressing emerging strains and reducing the global burden of disease.
Reference
| Target | Cat. No. | Product Name | Host | Isotype | |
| / | DMABB-JX1056 | Mouse Anti-Sapovirus Capsid monoclonal antibody, clone TWHD12 | Mouse | IgG1, κ | Inquiry |
