Cold cousin

This time we are looking on the crossword puzzle clue for: Cold cousin.
it’s A 11 letters crossword definition.
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Possible Answers:

FLU.

Last seen on: Wall Street Journal Crossword – May 21 2020 – To the Letter

Random information on the term “FLU”:

Orthomyxoviridae (ὀρθός, orthós, Greek for “straight”; μύξα, mýxa, Greek for “mucus”) is a family of 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 birds (see also avian influenza), humans, 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:

In a phylogenetic-based taxonomy, the category “RNA virus” includes the category “negative-sense ssRNA virus”, which includes the Order “Mononegavirales”, and the Family “Orthomyxovirus” (among others). The genera-associated species and serotypes of Orthomyxovirus are shown in the following table.

FLU on Wikipedia