NICE guidelines :www.nice.org.uk/guidance/ng188
"To develop the recommendations, we have used the following clinical definitions for the initial illness and long COVID at different times:
Acute COVID-19: signs and symptoms of COVID-19 for up to 4 weeks.
Ongoing symptomatic COVID-19: signs and symptoms of COVID-19 from 4 to 12 weeks.
Post-COVID-19 syndrome: signs and symptoms that develop during or after an infection consistent with COVID-19, continue for more than 12 weeks and are not explained by an alternative diagnosis.
In addition to the clinical case definitions, 'long COVID' is commonly used to describe signs and symptoms that continue or develop after acute COVID‑19. It includes both ongoing symptomatic COVID‑19 and post‑COVID‑19 syndrome (defined above)."
Clearly there are some people suffering with severe symptoms for longer than 12 weeks but 'long covid' also includes people who have 'signs and symptoms' 4-12 weeks later and these can be quite mild. I think there needs to be more of a distinction made between the groups. 80,000 children are not going to have long-lasting, damaging effects but some will and it is important to be able to distinguish them from the others.