COVID-19 pandemic

=== Signs and symptoms ===
{{Main|Symptoms of COVID-19}}
[[File:Symptoms of coronavirus disease 2019 4.0.svg|400px|thumb|[[Signs and symptoms|Symptoms]] of COVID-19]]
Symptoms of COVID-19 are variable, ranging from mild symptoms to severe illness.<ref name="CDC2020Sym"><!-- KEEP THIS NAMED REFERENCE -->{{#invoke:cite web||date=22 February 2021|title=Symptoms of Coronavirus|url=https://www.cdc.gov/coronavirus/2019-ncov/symptoms-testing/symptoms.html|url-status=live|archive-url=https://web.archive.org/web/20210304195413/https://www.cdc.gov/coronavirus/2019-ncov/symptoms-testing/symptoms.html|archive-date=4 March 2021|access-date=4 March 2021|website=U.S. [[Centers for Disease Control and Prevention]] (CDC)}}</ref><ref name="Grant et al 2020">{{#invoke:cite journal || vauthors = Grant MC, Geoghegan L, Arbyn M, Mohammed Z, McGuinness L, Clarke EL, Wade RG | title = The prevalence of symptoms in 24,410 adults infected by the novel coronavirus (SARS-CoV-2; COVID-19): A systematic review and meta-analysis of 148 studies from 9 countries | journal = PLOS ONE | volume = 15 | issue = 6 | pages = e0234765 | date = 23 June 2020 | pmid = 32574165 | pmc = 7310678 | doi = 10.1371/journal.pone.0234765 | bibcode = 2020PLoSO..1534765G | s2cid = 220046286 | doi-access = free }}</ref> Common symptoms include headache, [[Anosmia|loss of smell]] and [[Ageusia|taste]], [[Nasal Obstruction|nasal congestion]] and [[rhinorrhea|runny nose]], cough, [[muscle pain]], [[sore throat]], fever, [[diarrhea|diarrhoea]], and [[breathing difficulties]].<ref name="CDC2020Sym"/> People with the same infection may have different symptoms, and their symptoms may change over time. Three common clusters of symptoms have been identified: one respiratory symptom cluster with cough, [[sputum]], shortness of breath, and fever; a musculoskeletal symptom cluster with muscle and joint pain, headache, and fatigue; a cluster of digestive symptoms with abdominal pain, vomiting, and diarrhoea.<ref name="ECDC">{{#invoke:cite web||title=COVID-19/csse_covid_19_data/csse_covid_19_time_series at master · CSSEGISandData/COVID-19|url=https://github.com/CSSEGISandData/COVID-19/tree/master/csse_covid_19_data/csse_covid_19_time_series|website=GitHub|access-date=18 January 2022}}</ref> In people without prior ear, nose, and throat disorders, [[hypogeusia|loss of taste]] combined with [[hyposmia|loss of smell]] is associated with [[COVID-19]] and is reported in as many as 88% of cases.<ref name="Krishnan">{{#invoke:cite journal ||last1=Krishnan |first1=A |last2=Hamilton |first2=JP |last3=Alqahtani |first3=SA |last4=Woreta |first4=TA |title=COVID-19: An overview and a clinical update. |journal=World Journal of Clinical Cases |date=6 January 2021 |volume=9 |issue=1 |pages=8–23 |doi=10.12998/wjcc.v9.i1.8 |pmid=33511168 |pmc=7809683 |doi-access=free}}</ref><ref>{{#invoke:cite journal ||last1=Docherty |first1=Annemarie B. |last2=Harrison |first2=Ewen M. |last3=Green |first3=Christopher A. |last4=Hardwick |first4=Hayley E. |last5=Pius |first5=Riinu |last6=Norman |first6=Lisa |last7=Holden |first7=Karl A. |last8=Read |first8=Jonathan M. |last9=Dondelinger |first9=Frank |last10=Carson |first10=Gail |last11=Merson |first11=Laura |last12=Lee |first12=James |last13=Plotkin |first13=Daniel |last14=Sigfrid |first14=Louise |last15=Halpin |first15=Sophie |last16=Jackson |first16=Clare |last17=Gamble |first17=Carrol |last18=Horby |first18=Peter W. |last19=Nguyen-Van-Tam |first19=Jonathan S. |last20=Ho |first20=Antonia |last21=Russell |first21=Clark D. |last22=Dunning |first22=Jake |last23=Openshaw |first23=Peter JM |last24=Baillie |first24=J. Kenneth |last25=Semple |first25=Malcolm G. |title=Features of 20 133 UK patients in hospital with covid-19 using the ISARIC WHO Clinical Characterisation Protocol: prospective observational cohort study |journal=BMJ |date=22 May 2020 |volume=369 |pages=m1985 |doi=10.1136/bmj.m1985 |pmid=32444460 |pmc=7243036 |url=https://www.bmj.com/content/369/bmj.m1985 |access-date=27 May 2023 |issn=1756-1833}}</ref><ref name="pmid32483687">{{#invoke:cite journal || vauthors = Niazkar HR, Zibaee B, Nasimi A, Bahri N | title = The neurological manifestations of COVID-19: a review article | journal = Neurological Sciences | volume = 41 | issue = 7 | pages = 1667–1671 | date = July 2020 | pmid = 32483687 | pmc = 7262683 | doi = 10.1007/s10072-020-04486-3 }}</ref>