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Possible Answers:
FLU.
Last seen on: USA Today Crossword – Sep 14 2020
Random information on the term “FLU”:
Orthomyxoviridae (ὀρθός, orthós, Greek for “straight”; μύξα, mýxa, Greek for “mucus”) is a family of negative-sense RNA viruses. It includes seven genera: Alphainfluenzavirus, Betainfluenzavirus, Deltainfluenzavirus, Gammainfluenzavirus, Isavirus, Thogotovirus, and Quaranjavirus. The first four genera contain viruses that cause influenza in vertebrates, including humans, birds (see also avian influenza), and other mammals. Isaviruses infect salmon; the thogotoviruses are arboviruses, infecting vertebrates and invertebrates, such as ticks and mosquitoes. The Quaranjaviruses are also arboviruses, infecting arthropods as well as birds.
The four genera of Influenza virus that infect vertebrates, which are identified by antigenic differences in their nucleoprotein and matrix protein, are as follows:
The influenzavirus virion is pleomorphic; the viral envelope can occur in spherical and filamentous forms. In general, the virus’s morphology is ellipsoidal with particles 80 to 120 nm in diameter, or filamentous with particles 80 to 120 nm in diameter and up to 20 µm long. There are some 500 distinct spike-like surface projections in the envelope each projecting 10 to 14 nm from the surface with varying surface densities. The major glycoprotein (HA) spike is interposed irregularly by clusters of neuraminidase (NA) spikes, with a ratio of HA to NA of about 4.5 to 1.