In 2015, how many Ebola infections were attributed to casual contact?

The correct answer highlights that there were no documented Ebola infections attributed to casual contact during the 2015 outbreak. Ebola is primarily transmitted through direct contact with bodily fluids of an infected person or animal. These fluids can include blood, saliva, sweat, vomit, and other secretions. This means that transmission via casual contact, such as sharing space with an infected person without coming into contact with their bodily fluids, is not a recognized route of transmission for the virus.

During the outbreaks, cases typically involved more intimate interactions, such as caring for someone who was sick or handling remains of an individual who had died from the disease. Public health measures were aimed specifically at preventing direct contact with infected individuals or their fluids, underscoring the importance of understanding how the virus spreads.