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Mostly confined to countries in the Middle East so far, the virus has infected 837 people and killed at least 291, according to the World Health Organization (WHO).
"A lot of speculations have been made that MERS spreads significantly among family members and household contacts of active cases," said study lead researcher Dr. Ziad Memish, Saudi Arabia's assistant deputy minister of health for preventive medicine.
Memish's team studied 26 patients with MERS and their 280 household contacts. The researchers found that 12 people among the 280 household contacts came down with MERS.
According to Memish, that puts the odds of getting MERS from another person at about 5 percent.
"It's reassuring that very low transmission takes place at home among family contacts, and the majority of transmission occurs at health-care facilities," Memish said.
In fact, 25 percent of all MERS cases have been among health-care workers, according to WHO.
The new study's findings were published in the Aug. 28 issue of the New England Journal of Medicine.
Dr. Marc Siegel, an associate professor of medicine at NYU Langone Medical Center in New York City, agreed with the findings, saying, "MERS is not very contagious."
With measles, the chances of getting the disease from an infected person in your household are even higher, hitting 90 percent, Siegel said.
"This study shows that the chances of MERS becoming widespread is small," he said.
Siegel added that this low transmission rate has kept the virus largely confined to the Middle East, and the cases seen outside the region have been among people who traveled or worked in that area.
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