Coccolithovirus, a giant double-stranded DNA virus, infects Emiliania huxleyi, a species of coccolithophore. The virus was first observed in 1999 by W.H. Wilson and his team at the Marine Biological Association. It was sequenced for the EhV-86 strain during the summer of 2005, and was found to be a “giant-virus” having 472 protein-coding genes. It is the largest known marine virus by genome.