Ebola: How it spreads

While health officials are casting a wide net to find people who may have been around the Ebola patient now hospitalized in Dallas, they're also stressing that it takes close contact to really be at risk.

WHEN IS EBOLA CONTAGIOUS?

Only when someone is showing symptoms, which can start with vague symptoms including a fever, flu-like body aches and abdominal pain, and then vomiting and diarrhea. ...