In asymptomatic patients, 60% had abnormalities confined to one lung, while 90% of group 2 patients had abnormalities in both lungs. Those in groups 3 and 4 showed more mixed patterns and areas where fluid had replaced the air in the lung, leading to swelling and hardening of tissues.
http://www.cidrap.umn.edu/news-perspective/2020/02/studies-profile-lung-changes-asymptomatic-covid-19-viral-loads-patient?fbclid=IwAR33o5LDExXf2xM4xt0YrP3qS-UmInAhZw5sNwt_tuq3niYnAjYbc8W1lvs