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American Focus > Blog > Tech and Science > A Norovirus Vaccine Is Closer Than Ever Before
Tech and Science

A Norovirus Vaccine Is Closer Than Ever Before

Last updated: February 17, 2025 3:58 pm
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A Norovirus Vaccine Is Closer Than Ever Before
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Norovirus is a highly contagious virus that causes a range of gastrointestinal symptoms, including diarrhea and vomiting. This winter, the infection has been rampant, affecting many people across the country. Despite its prevalence and severity, there is currently no vaccine available to prevent norovirus infection. However, researchers have been working diligently to develop an effective vaccine to combat this troublesome virus.

Unlike the seasonal flu and COVID-19, norovirus presents unique challenges for vaccine development. The virus is notoriously transmissible and resilient, making it difficult to kill with common disinfectants. Additionally, norovirus is actually a group of viruses with multiple genotypes, making it challenging for the immune system to provide lasting protection. Dominant strains of the virus can change frequently, further complicating vaccine development efforts.

One of the key obstacles to creating a norovirus vaccine is the virus’s ability to cause mucous membrane infections in the intestines. This localized infection makes it harder for the body to develop a robust and long-lasting immune response. Traditional injected vaccines may only provide partial protection against severe disease, rather than preventing infection entirely.

Despite these challenges, researchers are actively working on various vaccine candidates for norovirus. These candidates target the virus’s primary surface protein, known as the capsid protein, which encases the virus molecule. Different approaches are being explored, each with its own strengths and weaknesses. Some vaccines use virus-like particles that mimic the shape of the virus, while others utilize a modified adenovirus to deliver the target norovirus protein directly to the mucosal immune system.

Clinical trials are underway for several vaccine candidates, with promising results in adult populations. However, challenges remain in developing a vaccine that is effective across all age groups, particularly vulnerable populations such as young children and older adults. Researchers are hopeful that continued efforts will lead to the development of a safe and effective norovirus vaccine in the near future.

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In the meantime, it is essential to practice good hygiene and sanitation measures to prevent the spread of norovirus. Washing hands frequently, disinfecting surfaces, and avoiding close contact with infected individuals can help reduce the risk of infection. By staying informed and taking proactive steps to protect ourselves and others, we can help combat the spread of this dreaded virus and stay healthy during norovirus season. The protection rate is still rather low, however, Tan says.

The latest efforts to develop a norovirus vaccine are showing promise, with researchers exploring new approaches to combat this highly contagious and often debilitating virus. One such approach involves utilizing mRNA technology, similar to the technology used in some of the COVID vaccines. This method involves injecting genetic information for the norovirus protein into the vaccine recipient to stimulate an immune response. According to experts like Fink, this approach is simpler to implement and can be easily updated to target different strains of the virus as they evolve.

Moderna, a leading pharmaceutical company, has designed an mRNA norovirus vaccine and is currently in the process of recruiting participants for clinical trials to assess its effectiveness. This vaccine will be compared to other approaches, such as viruslike particles and adenovirus vectors, which have not yielded satisfactory results so far. While the efficacy of the mRNA vaccine remains to be seen, scientists are hopeful that it could offer better protection against norovirus.

Despite the potential advancements in vaccine development, it is unlikely that a norovirus vaccine will become a standard annual vaccine like the flu shot. Instead, the vaccine may be initially targeted towards older adults and immunocompromised individuals who are at higher risk of severe norovirus infections. It may also be recommended for individuals who are planning to travel on cruises or anticipate exposure to the virus during peak norovirus season, which typically occurs between November and April in the Northern Hemisphere.

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While some experts believe that healthy adults may not be as interested in a norovirus vaccine, others like Fink emphasize the importance of having a preventive option available. Even if the vaccine is not 100% effective in preventing infections, reducing the severity of illness and shifting the burden of disease could still be considered a significant success. Ultimately, the goal is to minimize the impact of norovirus outbreaks and protect vulnerable populations from the potentially serious consequences of this common virus.

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