Meryl Nass, an internal medicine physician in Ellsworth, Maine, first highlighted the page on her own blog over the weekend.

The page was a PDF document that explained the difference between infections spread through the air or by droplets. The PDF had been taken down as of Thursday afternoon, with this message in its place: “The What’s the difference between infections spread through air or by droplets? Fact sheet is being updated and is currently unavailable. Please visit cdc.gov/Ebola for up-to-date information on Ebola.”

An earlier version of the page is still available in Google’s cache. It said that while Ebola is not “airborne” like chickenpox or tuberculosis, it can travel a few feet in the air inside droplets emitted when someone coughs or sneezes.