While not a great analogy, think of an unrelated disease, such as Ebola. There have been major outbreaks of a disease like Ebola in Africa but the disease does not cause similar outbreaks in Western Countries. Part of that is that these poorer countries, with more malnourished populations, tend to be more susceptible so precautions can be taken before the disease spreads.
How do you come up with this stuff?
Ebola in the U.S.
An infected U.S. health care worker arrived March 13, 2014, at the National Institutes of Health Clinical Center in Bethesda, MD, for treatment, the NIH said in a statement. The person, who was not identified, caught the virus while working as a volunteer at an Ebola treatment center in Sierra Leone, the NIH said.
The health care worker, who at one point was in critical condition, was released from the clinical center on April 9, 2014, the NIH said in a statement.
No further information was released about the health care worker, who was the second American to be treated at the NIH facility. The first was Nina Pham, 26, a Dallas nurse who caught Ebola after treating Thomas Eric Duncan, a Liberian man who later died. Pham recovered from the virus.
She was one of two nurses at Texas Health Presbyterian Hospital who caught Ebola after treating Duncan. The second, Amber Vinson, 29, also recovered after being treated at Atlanta’s Emory University Hospital.
Duncan arrived in the U.S. on Sept. 20, 2014, to visit relatives. Ten days later, he became the first person to be diagnosed with Ebola in the U.S. He died Oct. 8, 2014.
In November 2014, a surgeon from Sierra Leone who lives in the United States died after being flown to the Nebraska Medical Center for treatment. Martin Salia, who was reportedly working at a hospital in the Sierra Leone capital of Freetown, arrived in the U.S. Nov. 15 and was taken to the medical center.
He was in extremely critical condition, suffering from kidney and respiratory failure, when he arrived, the hospital said. “We used every possible treatment available to give Dr. Salia every possible opportunity for survival,” said Phil Smith, MD, medical director of the hospital’s biocontainment unit. That included giving him the experimental treatment ZMapp, also given to other Ebola patients, according to the hospital.
But Salia’s disease was “extremely advanced,” Smith said in a statement.
Salia was reportedly a permanent U.S. resident who lived in Maryland with his family. Two other Americans -- Rick Sacra, MD, and cameraman Ashoka Mukpo -- recovered from Ebola after being treated in the Omaha isolation unit.
Craig Spencer, MD, a Doctors Without Borders physician who returned to the U.S. after treating Ebola patients in Guinea, was also diagnosed with the disease. He recovered after getting treatment at New York’s Bellevue Hospital in November 2014.
In total, six Americans infected with the virus in Africa have been brought back to the U.S. for treatment. All six, including aid workers Kent Brantly, MD, and Nancy Writebol, have recovered.
The fourth person was flown back to the U.S. in September 2014 for treatment at Atlanta’s Emory University Hospital, where Brantly and Writebol were also treated. This person's arrival came after the WHO said one of its doctors was being evacuated from Sierra Leone after getting Ebola. The man was released from the hospital in October 2014. The hospital said at the time he wanted to remain anonymous.
But a
New England Journal of Medicine case report on the doctor, published May 7, 2015, identified him as Ian Crozier, MD, 43, an infectious disease specialist. The case report said that during his recovery, Crozier got severe uveitis, an inflammation of the middle layer of the eye that has many blood vessels.
Doctors found Crozier had Ebola virus in the clear fluid between his eye lens and cornea. They spotted it 10 weeks after the virus was no longer detectable in his blood. The case study suggested other Ebola survivors could be at risk of uveitis, too.
FAQ: The Deadly Ebola Virus
Viruses don't propagate well, if they kill off their host before the host can spread the disease.