Norovirus particle. Computer illustration showing the structure of the protein coat (capsid) surrounding a norovirus particle (virion) Norovirus virions consist of an outer protein coat (capsid) encasing RNA (ribonucleic acid), the genetic material of the virus. Norovirus, also known as the winter vomiting bug, is the most common cause of viral gastroenteritis in humans. It causes vomiting, diarrhoea and fever.
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