Kam Kalantar-Zadeh, a specialist in internal medicine, nephrology and pediatrics at UC Irvine [said] “As an analogy, the common cold has no cure, no long-lasting immunity — we can get several colds a year — and no cure, which may be the emerging bitter reality in dealing with COVID-19.” … Philip L. Felgner, director of UC Irvine’s Vaccine Research and Development Center … [said] “We don’t know how much of the 10% is due to cross-reactivity from other common coronaviruses,” he said. “He would need to compare (antibody) levels from specimens collected several years ago before the outbreak.” Felgner’s lab has many thousands of pre-outbreak specimens that could be used for comparison, he said.
This Irvine company tested most of its workforce for coronavirus antibodies. The results were startling
Orange County Register, April 23, 2020
April 23, 2020