How long is a person with sars infectious to others?  

CDC says. 10 days after the resolution of symptoms, especially fever the person with a confirmed sars case can leave isolation.
During symptoms. People with sars are thought to be infectious while they have symptoms. Their ability to spread it to other peaks duirng the second week of illness. If infected with sars you will be quartined to your house until fever free for 10 days to prevent spreading it to others.