Table 1.

Integrative classification of COVID-19 and long-COVID

Classification	Reference time point for relapse of COVID-19 symptoms
Classification by NICE (UK) (https://www.nice.org.uk/guidance/ng188)
Acute COVID-19	< 4 Weeks
Ongoing symptomatic COVID-19	4–12 Weeks
Post-COVID-19 syndrome	> 12 Weeks
Classification by Fernández-de-Las-Peñas et al. [4]
Potentially infection related-symptoms	< 4–5 Weeks
Acute post-COVID symptoms	Week 5 to Week 12
Long post-COVID symptoms	Week 12 to Week 24
Persistent post-COVID symptoms	> 24 weeks