What does Long COVID look like over 7 months?
In 3,762 respondents, recovery usually took >35 weeks; fatigue, PEM, and cognitive issues dominated after month 6, with major work impacts.
Source
Characterizing long COVID in an international cohort: 7 months of symptoms and their impact
Study at a glance
- Design
- Cross-sectional — International online survey of people with suspected/confirmed COVID lasting >28 days
- N
- N=3762 · 1020 confirmed + 2742 suspected; 56 countries; onset before June 2020
- Population
- Adults with prolonged COVID symptoms recruited via support groups/social media
- Outcome
- Symptom prevalence/trajectory over ~7 months and work/life impact
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
Online survey (Sep–Nov 2020) of confirmed or suspected COVID cases lasting >28 days from 56 countries, mapping 203 symptoms across 10 organ systems and 66 symptoms over seven months.
What they found
>91% took >35 weeks to recover. Mean ~56 symptoms across ~9 organ systems. After month 6, fatigue, post-exertional malaise, and cognitive dysfunction were most frequent; ~86% reported relapses. Many needed reduced work schedules or were not working due to illness.
The limits
What it doesn't show
Support-group sampling over-represents severely affected respondents and cannot estimate population prevalence; confirmed vs suspected groups were similar but not a random sample.
Key terms
- Long COVID
- Prolonged symptoms after acute SARS-CoV-2 illness.
- Post-exertional malaise
- Symptom worsening after physical or mental effort.
- Cognitive dysfunction
- Thinking/memory problems reported across ages.
- Relapse
- Return or worsening of symptoms after improvement.
- Organ systems
- Ten body systems used to group 203 symptoms.
- Patient-led cohort
- Recruitment via support groups and social media.
Flashcards
Research intelligence for this paper
See its role on concept claims, tensions it is part of, placement history, and related discoveries.
Quiz yourself
Sample size?
Common questions
Sample size?
3,762 respondents from 56 countries.
Recovery timing?
>91% still not recovered by 35 weeks.
Top late symptoms?
Fatigue, PEM, cognitive dysfunction.
Work impact?
45.2% reduced schedule; 22.3% not working due to illness.
More on Telemedicine