Everyone can help to fight the novel coronavirus pneumonia.
This is the first time the CDC has implemented enhanced screenings since the 2014 Ebola outbreak.
Viral studies have become rampant lately, as new species of human viruses are constantly being identified.
Several of ADF's attacks have been claimed by Islamic State, but the extent of their relationship remains unclear.
The vaccine is already being used under emergency guidelines to try to protect people against the spread of a deadly Ebola outbreak in Democratic Republic of Congo.
A recent outbreak in West Africa killed over 11,000 people.
"The core drivers are all key human issues of trust, habits, fears and beliefs. That is the mix that now underpins the spread of any disease."
WHO director-general Tedros Adhanom Ghebreyesus identified the doctor killed as Richard Mouzoko, a senior epidemiologist from Cameroon.
The current outbreak clearly poses an immediate threat to people in the region, but it is not obvious that it poses an immediate danger to people worldwide.