In children sick enough to be referred to hospital for COVID-19, we aim to study

  1. Risk factors of severe acute infection, with particular emphasis on vulnerable groups.
  2. The immune response to COVID-19, with particular emphasis on initial innate immunity.
  3. The long-term effects, in particular chronic lung disease, haematological deficits and post-infectious chronic fatigue.

Children referred to hospital with symptoms suspicious of COVID-19 will be included. We will compare children with confirmed COVID-19 to those with negative COVID-19 tests.