You can be a carrier and spread it to someone who does develop the disease. Screening is important in public health and in personalized medicine. Adults of the correct demographic are screened for STDs. Those of other demographics undergo cancer screening. Screening to prevent spread or development of fulminant disease is not unique to COVID.
Have what? Disease is causative agent plus detrimental effects. Disease is not causative agent alone. Every human on the planet is colonized with staph, strep and/or e coli. Not every human on the planet is diseased because of them.
Correct. COVID-19 is the disease caused by SARS-CoV-2. You can have the virus and not the disease it causes. You can have staph and not have necrotizing fasciitis. You can have strep and not have pneumonia. You can have E. Coli and not have hemolytic-uremic syndrome. You can have a seasonal flu virus and not have symptomatic “flu.”
False. This is used by the media and for simplicity reasons but is technically incorrect. By definition you cannot have asymptomatic COVID-19. You can have SARS-CoV-2 without symptoms. You can be an asymptomatic carrier of SARS-CoV-2.