Scientists have uncovered a new and unexpected link between a virus found in sea animals and a growing eye disease in humans. This discovery suggests that infections can sometimes jump between species, raising new concerns for public health.
The research, published in Nature Microbiology, looked at a condition that has been appearing more often in recent years. This condition causes high pressure inside the eye and inflammation, which can damage vision if not treated properly.
Doctors were puzzled because patients with this condition tested negative for the usual viruses that cause eye infections. This led researchers to search for other possible causes.
They focused on a virus known as covert mortality nodavirus, or CMNV. This virus is commonly found in marine animals such as shrimp and fish. Until now, it had not been linked to human disease.
To investigate, scientists studied 70 patients diagnosed with this eye condition. They examined tissue samples from their eyes using advanced imaging techniques. They found tiny virus particles that closely matched CMNV.
Further testing confirmed that the virus in the patients was nearly identical to the version found in aquatic animals. This suggests that the virus may have crossed from marine life into humans.
The researchers also explored how people might have been exposed to the virus. Many patients reported handling raw seafood without protection or eating raw fish and shellfish. These activities may increase the risk of infection.
To confirm whether the virus could cause disease, scientists conducted experiments in the lab and in animals. They found that the virus could trigger similar symptoms, including increased eye pressure, which is a key feature of the human condition.
This strengthens the evidence that the virus is not just present but may play a direct role in causing the disease.
The study also found that CMNV is widespread. It has been detected in many types of sea animals across different continents. This raises the possibility that similar infections could occur in other parts of the world.
However, the study has important limitations. It does not prove exactly how the virus infects humans or how often this happens. More research is needed to understand the risks and to develop effective treatments.
Even so, the findings highlight the importance of food safety and proper handling of seafood. Wearing gloves when handling raw fish and avoiding raw seafood may help reduce exposure.
This discovery also shows how closely human health is connected to the natural environment. As global food systems and trade expand, the chances of new diseases appearing may increase.
In summary, this research provides important new insights into how viruses can cross species and affect human health. It also points to the need for better monitoring and prevention strategies.
If you care about eye health, please read studies about how vitamin B may help fight vision loss, and MIND diet may reduce risk of vision loss disease.
For more information about eye disease, please see recent studies about how to protect your eyes from glaucoma, and results showing this eye surgery may reduce dementia risk.
Source: Chinese Academy of Sciences.
