description link name A short-term infection or disease characterized by a dramatic onset and rapid recovery. Primary infections fall under this category. https://dst.liai.org/BcellDisc.html Acute/Recent onset A long-term infection or illness and partial remission. https://dst.liai.org/BcellDisc.html Chronic Patient is uninfected. There are no clinical or virological evidence of infection. https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179010 COVID-19 Disease Severity 0 Patient is ambulatory without limitation of activities. https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179011 COVID-19 Disease Severity 1 Patient is ambulatory but there is limitation of activities. https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179012 COVID-19 Disease Severity 2 Patient is hospitalized with mild disease but does not require oxygen therapy. https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179013 COVID-19 Disease Severity 3 Patient is hospitalized with mild disease but requires oxygen by mask or nasal prongs. https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179014 COVID-19 Disease Severity 4 Patient is hospitalized with severe disease and requires non-invasive ventilation or high-flow oxygen. https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179015 COVID-19 Disease Severity 5 Patient is hospitalized with severe disease and requires intubation and mechanical ventilation. https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179016 COVID-19 Disease Severity 6 Patient is hospitalized with severe disease and requires ventilation plus additional organ support via vasopressor therapy, renal replacement therapy, or extracorporeal membrane oxygenation. https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179017 COVID-19 Disease Severity 7 Patient is dead. https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179018 COVID-19 Disease Severity 8 Defined by the criteria for acute respiratory distress syndrome (ARDS), sepsis, septic shock, or other conditions that would normally require the provision of life-sustaining therapies such as mechanical ventilation (invasive or non-invasive) or vasopressor therapy. https://www.who.int/publications/i/item/WHO-2019-nCoV-clinical-2021-1 Critical COVID-19 Defined as absence of any criteria for severe or critical COVID-19. https://www.who.int/publications/i/item/WHO-2019-nCoV-clinical-2021-1 Non-severe COVID-19 Any disease stage that cannot be classified under the selections above will be classified under "other." Household contacts will be recorded as "other". https://dst.liai.org/BcellDisc.html Other Recovery from an illness, including latent (potentially existing but not presently evident or realized) and remission (a period during which symptoms of disease disappear [complete remission]). Note that partial remission will be recorded as "chronic". https://dst.liai.org/BcellDisc.html Post Corresponds to WHO Severity Scale 8. Dead. https://ncithesaurus.nci.nih.gov/ncitbrowser/ SeroNet Covid-19 Disease Severity Death Corresponds to WHO severity scale: (1) Ambulatory, asymptomatic or no limitation of activities or (2) ambulatory, limitation of activities. https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179011, https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179012 SeroNet Covid-19 Disease Severity Mild Corresponds to WHO severity scale: (3) Hospitalized, no oxygen therapy or (4) hospitalized, oxygen by mask or nasal prongs. https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179013, https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179014 SeroNet Covid-19 Disease Severity Moderate Corresponds to WHO severity scale: (5) Hospitalized with severe disease and non-invasive ventilation or high-flow oxygen, or (6) hospitalized with severe disease with intubation and mechanical ventilation, or (7) hospitalized with severe disease ventilation + additional organ support - pressors, RRT, ECMO https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179015, https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179016, https://ncithesaurus.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=21.10d&ns=ncit&code=C179017 SeroNet Covid-19 Disease Severity Severe Covid-19 disease severity is not known. https://ncithesaurus.nci.nih.gov/ncitbrowser/ SeroNet Covid-19 Disease Severity Unknown Defined by any of: Oxygen saturation < 90% on room air. Respiratory rate > 30 breaths/min in adults and children > 5 years old; >= 60 breaths/min in children < 2 months old; >= 50 in children 2–11 months old; and >= 40 in children 1–5 years old. Signs of severe respiratory distress (accessory muscle use, inability to complete full sentences, and, in children, very severe chest wall indrawing, grunting, central cyanosis, or presence of any other general danger signs). https://www.who.int/publications/i/item/WHO-2019-nCoV-clinical-2021-1 Severe COVID-19 Used when the disease stage is not clearly specified or known. https://dst.liai.org/BcellDisc.html Unknown