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A virus that can cause blindness has been detected in China — there is currently no cure The CMNV virus previously affected only fish and shrimp, but has now been identified in humans. It causes eye inflammation and increased intraocular pressure. In severe cases, this can lead to vision loss. Most infections are linked to raw fish consumption or unprotected contact with seafood. There is no specific treatment yet. Doctors can only use medications to reduce inflammation and lower pressure. The virus is destroyed by heat treatment. So far, the number of cases is limited, but after the COVID-19 pandemic — which began in China and claimed millions of lives — any new virus emerging from the country is receiving heightened attention.