Editing Common cold (section)

===Viruses===
[[File:Coronaviruses 004 lores.jpg|thumb|upright=1|[[Coronavirus]]es are a group of viruses known for causing the common cold. They have a halo or crown-like (corona) appearance when viewed under an electron microscope.]]
The common cold is an infection of the upper [[respiratory tract]] which can be caused by many different viruses. The most commonly implicated is a [[rhinovirus]] (30–80%), a type of [[picornavirus]] with 99 known [[serotype]]s.<ref>{{cite journal |vauthors=Palmenberg AC, Spiro D, Kuzmickas R, Wang S, Djikeng A, Rathe JA, Fraser-Liggett CM, Liggett SB |display-authors=6 |title=Sequencing and analyses of all known human rhinovirus genomes reveal structure and evolution |journal=Science |volume=324 |issue=5923 |pages=55–9 |date=April 2009 |pmid=19213880 |pmc=3923423 |doi=10.1126/science.1165557 |bibcode=2009Sci...324...55P}}</ref> Other commonly implicated viruses include [[coronavirus]]es, [[adenovirus]]es, [[enterovirus]]es, [[parainfluenza]] and [[Respiratory syncytial virus|RSV]].<ref name=ebm>{{cite book |chapter=Common Cold: Cause |vauthors=Janicki-Deverts D, Crittenden CN|title=Encyclopedia of Behavioral Medicine |page=504 |publisher=Springer |doi=10.1007/978-3-030-39903-0_795 |veditors=Gellman MD |year=2020 |edition=2nd|isbn=978-3-030-39901-6 |s2cid=242944824 }}</ref> Frequently more than one virus is present.<ref>Eccles p. 107</ref> In total, more than 200 viral types are associated with colds.<ref name=Eccles2005 /> The viral cause of some common colds (20–30%) is unknown.<ref name=ebm/>