Seasonal affliction

This time we are looking on the crossword puzzle clue for: Seasonal affliction.
it’s A 19 letters crossword definition.
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Last seen on: LA Times Crossword 10 Oct 21, Sunday

Random information on the term “FLU”:

Orthomyxoviridae (from Greek ὀρθός, orthós ‘straight’ + μύξα, mýxa ‘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 birds (see also avian influenza) and mammals, including humans. Isaviruses infect salmon; the thogotoviruses are arboviruses, infecting vertebrates and invertebrates (such as ticks and mosquitoes). The Quaranjaviruses are also arboviruses, infecting vertebrates (birds) and invertebrates (arthropods).

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 100–120 nm in diameter, or filamentous with particles 80–100 nm in diameter and up to 20 µm long. There are approximately 500 distinct spike-like surface projections in the envelope each projecting 10–14 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 10 to 1.

FLU on Wikipedia