But as others have pointed out above, we don't really know yet because Covid19 hasn't been around for long enough.
Various studies are now being done though, including a large one (10,000 people) which will follow people for a year.
^Proal points out that chronic conditions are associated with many pathogens. Parents should be aware, she said, that all well-studied bacterial or viral pathogens that she knows of have related chronic syndromes, including Zika, Ebola, measles, and polio.
While she cautions that researchers simply cannot know whether the long-haulers will become life-longers, “it’s very unlikely,” she says, that SARS-CoV-2 would be the one virus that doesn’t have an associated chronic condition.
O’Leary, the pediatric disease specialist, who himself has had intermittent, on-going Covid symptoms since March, has heard researchers conjecture about what could be driving long-haul symptoms. “But we don’t know, it’s all speculation at this point,” he cautions. O’Leary says that it will be difficult to determine if long-term symptoms after SARS-CoV-2 are more common than with other viral infections — some of which can result in persistent symptoms in some kids. With SARS-CoV-2, he noted in a follow-up email, “we still need to understand if children with persistent symptoms have immune system abnormalities that can be measured with currently available tests — most children with ongoing symptoms from other viruses do not — or if somehow the virus is persisting within the body.”
Without more data, both doctors and patients are left with few resources in the middle of a fast-moving pandemic. ^
undark.org/2020/09/02/kids-covid-19-long-haulers/