[NTR] COVID 19 illness level terms in NIH treatment guidance

[nicolevasilevsky]

These terms were requested in HPO and may be more suitable for Mondo, see ticket: https://github.com/obophenotype/human-phenotype-ontology/issues/5787

NIH COVID-19 treatment guidelines defined following illness categories:

• Asymptomatic or Presymptomatic Infection: Individuals who test positive for SARS-CoV-2 but have no symptoms

• Mild Illness: Individuals who have any of various signs and symptoms (e.g., fever, cough, sore throat, malaise, headache, muscle pain) without shortness of breath, dyspnea, or abnormal imaging

• Moderate Illness: Individuals who have evidence of lower respiratory disease by clinical assessment or imaging and a saturation of oxygen (SpO2) >93% on room air at sea level.

• Severe Illness: Individuals who have respiratory frequency >30 breaths per minute, SpO2 ≤93% on room air at sea level, ratio of arterial partial pressure of oxygen to fraction of inspired oxygen (PaO2/FiO2) <300, or lung infiltrates >50%

• Critical Illness: Individuals who have respiratory failure, septic shock, and/or multiple organ dysfunction

Please consider to add.

[nicolevasilevsky]

@cmungall @mellybelly Do these seem like suitable terms for Mondo?