This theory of "killing means they can't spread anymore" doesn't really work out with diseases like sars-cov2. It might have worked in a medieval world where people travel by foot, horseback or sailboat, and with a disease where the carrier stays contagious forever.
But we are in a modern world where travel around the globe happens in 24 hours. Covid is contagious for some time before the patient has any symptoms, and for most people, it stops being contagious by the time some of the carriers are so sick they might die.
So, when a patient starts having symptoms in 5 days, (s)he may have had time to infect other people on more than two continents.
But we are in a modern world where travel around the globe happens in 24 hours. Covid is contagious for some time before the patient has any symptoms, and for most people, it stops being contagious by the time some of the carriers are so sick they might die.
So, when a patient starts having symptoms in 5 days, (s)he may have had time to infect other people on more than two continents.