Lassa virus (LASV) causes Lassa fever. It's an arenavirus.
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One in 100 patients with Lassa Fever die. 80% of pregnant women
in the last trimester with Lassa Fever die.
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A common mouse, Mastomys natalensis, is the reservoir for Lassa fever.
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Lassa fever is a virus. It does not have a gram stain
characteristic.
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The virus families most closely related to Lassa Fever virus are
the arenaviruses, as well as bunyaviridae and orthomyxoviridae.
Lassa Fever virus is in the aernavirus family.