Nipah virus is a single stranded, enveloped RNA virus. The virions are enveloped particles composed of a tangle of filamentous nucleocapsids and measure as large as 1900 nm in diameter. The nucleocapsid has the characteristic helical and herringbone structure of paramyxoviruses. The Nipah virus belongs to a new genus Henipaviruses within the family Paramyxoviri-dae. The Nipah virus genome is 12 nucleotides longer than the Hendra virus genome, and both have identical leader and trailer sequence lengths and hexamer-phasing positions for all their genes (38,39).

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