Reynold A. Panettieri Jr., vice chancellor for clinical and translational science at Rutgers University, said some mild cases last just three to four days. Others who are not sick enough for hospitalization still may have symptoms for two weeks. Presentation of the disease is, he said, “very individualistic and very heterogeneous." Some people are barely affected and some have “shaking chills” and muscle aches, he said. Shortness of breath may manifest in two to three days. More severe symptoms may portend a rougher course, but it’s not yet clear if they do.