The first of two American aid workers infected with the deadly Ebola virus while in Liberia has arrived in the United States, where he will be treated in isolation at an Atlanta hospital, officials said.
The patients are transported using a plane equipped with a microbial containment system. They are placed inside an isolation plastic tent, and all medical staff are required to wear protective gear.
Despite alarm by some in the United States over bringing Ebola patients to the country, health officials have said bringing the sickened aid workers into the country would not put the public at risk.
Ebola is spread by body fluids, and can be caught by touching the person or touching a surface on which the infected fluid has been deposited, for example in a bathroom.
Ebola is not spread by sneezing, coughing or by insect bites.
As it reaches seven months since the Ebola outbreak started we take a look at the timeline of events leading up to the spread of the virus.
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A man has been filmed helping an Ebola patient onto a plane without wearing any protective equipment.