The high-risk group includes older adults ( 60 years of age and olderAt-risk groups and coronavirus ) , those with a weak immune system ( i.e . due to cancer treatment , treatment for autoimmune diseases , HIV , organ transplant or bone-marrow transplant ) , smokersAt-risk groups and coronavirus and those with serious underlying medical conditions ( such as heart disease , diabetes , lung disease face increased risk of serious illness and complications and have been advised to avoid crowds and stay home as much as possible in areas of community outbreak.
US CDC has warned the elderly and people with underlying health conditions to remain indoors .