COVID-19 Disease Progression: The Typical Timeline (March 2020)
Based on the first two large Wuhan case series (The Lancet, JAMA), as reported in March 2020. Understanding has evolved since — this is the historical picture, not current medical guidance.
| Day | Typical course | |-----|---------------| | Day 1 | Fever, often with fatigue, muscle pain, and dry cough. A small minority had diarrhea or nausea 1–2 days before. | | Day 5 | Difficulty breathing (dyspnea), mostly in older patients or those with pre-existing conditions. | | Day 7 | Patients with dyspnea tended to be admitted to hospital; about 85% of patients began to improve. | | Day 8 | Severe cases could develop acute respiratory distress syndrome (ARDS) — roughly 15% of cases, per the Chinese CDC. | | Day 10 | Worsening patients tended to enter intensive care; average hospital stay was about 10 days. | | Day 12 | Fever typically ended, per the first Wuhan study. |
This article is general historical information, not medical advice. Originally published March 2020.
Note: this timeline overlaps with our fuller account, "How COVID-19 Progressed: The March 2020 Picture."
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