A rare Covid-19 complication was reported in children. Now, it's showing up in adults.

Then the antibody tests were positive."Further blood tests revealed extremely high levels of inflammation in the body.What's more, while most severely ill Covid-19 patients tend to be over age 65 or to have multiple underlying health problems, these patients "were younger people that you would expect to not get sick," Abbo said."That's what caught our attention."There's no proven treatment for MIS-A. IVIG, on the other hand, is more of a hodgepodge of antibodies that aren't specific to the coronavirus.The thinking is that MIS-A patients already have Covid-19 antibodies, so adding more with convalescent plasma is unlikely to help.The current theory for MIS-A patients is that "the infection, as far as we know, is gone," said Dr. Hugh Cassiere, director of critical care services for Sandra Atlas Bass Heart Hospital at North Shore University Hospital, part of Northwell Health, on Long Island, New York."It's the antibodies that have been produced that seem to be causing a problem," he said.Cassiere was part of a large team of physicians who treated the surge of Covid-19 patients in New York this spring. But it will take an all-hands-on-deck approach to identify patients with MIS-A."This needs to be in the forefront of every intensive care unit physician's mind who's seeing patients, especially when they have Covid-19 antibodies," Cassiere said.Given Femia's experience, that includes those who specialize in dermatology."This is really the beauty of medicine, where, for this syndrome, many different specialists need to come together to help make the diagnosis," Femia said.Physicians worry that many MIS-A patients will go undetected — and perhaps untreated."There's not enough data for me to tell you what the long-term effects of this could be," Cassiere said.