The biggest misconception about Ebola is …

(CNN) – The single, biggest misconception about Ebola is that "it's very easy to catch it," says CNN medical analyst Dr. Alexander van Tulleken.

"We have health care workers, like Nina Pham, who caught it even though she was wearing protective gear, so it's a very tricky distinction to make between contagious and infectious," he said.

"Just a single drop of infected bodily fluids can give you Ebola. But it's not very contagious, because most of the people exposed to it don't catch it," said van Tulleken.

For more of our interview with Dr. Alexander van Tulleken, check out the video above.