Older adults with Covid-19, the illness caused by the coronavirus, have several “atypical” symptoms, complicating efforts to ensure they get timely and appropriate treatment, according to physicians. Covid-19 is typically signaled by three symptoms: a fever, an insistent cough and shortness of breath. But older adults — the age group most at risk of severe complications or death from this condition ? may have none of these characteristics. Instead, seniors may seem “off” — not acting like themselves ? early on after being infected by the coronavirus. They may sleep more than usual or stop eating. They may seem unusually apathetic or confused, losing orientation to their surroundings. They may become dizzy and fall. Sometimes, seniors stop speaking or simply collapse. “With a lot of conditions, older adults don’t present in a typical way, and we’re seeing that with Covid-19 as well,” said Dr. Camille Vaughan, section chief of geriatrics and gerontology at At advanced ages, “someone’s immune response may be blunted and their ability to regulate temperature may be altered,” said Dr. Joseph Ouslander, a professor of geriatric medicine at Florida Atlantic University’s Schmidt College of Medicine. “Underlying chronic illnesses can mask or interfere with signs of infection,” he said. “Some older people, whether from age-related changes or previous neurologic issues such as a stroke, may have altered cough reflexes.