This transmission electron micrograph (TEM) revealed the presence of the human parainfluenza type 4A virus (HPIV-4A), which like the mumps virus, is also a Paramyxoviridae family member, and a member of the genus, Rubulavirus.
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Human Parainfluenza Virus Type-4a (HPIV-4) – Paramyxoviridae family, genus Rubulavirus
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