Shots - Health News
Thu April 24, 2014
Why The U.S. Is Worried About A Deadly Middle Eastern Virus
Originally published on Mon April 28, 2014 6:52 am
UPDATE at 4:17 p.m. Friday: Saudi Arabia has confirmed 313 cases of the Middle East Respiratory Syndrome, including 92 deaths, the Ministry of Health said Friday. Of note, one of the 14 new patients caught the virus while working as a hospital receptionist.
The latest medical acronym to fear is MERS: Middle East Respiratory Syndrome. The virus has killed 83 people in the Arabian Gulf since first emerging in 2012 and now looks as if it could pose a global threat.
This week, the number of new cases rose at a rate that causes concern, the World Health Organization said in a statement.
There have been only about 350 cases detected worldwide in the past two years. But Saudi Arabia has reported more than 50 in just four days. Cases also turned up in Greece, the Philippines, Malaysia and Jordan. All of the patients were exposed to the virus in the Gulf.
There's no treatment or vaccine for MERS, which kills about 30 percent of those who are infected.
The disease hits like a severe flu. Symptoms include fever, coughing and shortness of breath. Most people who die have another medical condition. It's also possible for someone to become infected but show no symptoms.
Many of the new cases occurred in health care facilities in Saudi Arabia and the United Arab Emirates, according to the World Health Organization's Eastern Mediterranean office.
MERS is similar to the SARS virus, which killed roughly 800 people in Asia in 2003. Late in the SARS epidemic, the virus mutated in a way that allowed it to move more easily from person to person. Some MERS researchers are concerned that MERS is evolving in this way.
Scientists don't know where people are initially catching the virus. So it's been hard to control. Once a person gets sick, he can spread it to relatives and medical staff.
Hospital staffs in the affected region should wear gloves and masks, says WHO spokesman Tarik Jasarevic. Equipment should be meticulously sterilized, and every patient should be treated as a possible carrier.
"Some [patients] have mild or unusual symptoms," Jasarevic tells Shots. "For this reason, it's important that health care workers apply standard precautions with all patients."
Because the virus is so deadly and so little is known about how it spreads, MERS patients are supposed to be treated in isolation.
WHO plans to send a team of international disease experts to the region to help contain the problem.
The U.S. Centers for Disease Control and Prevention has been preparing for the possibility that a MERS case could walk off an airplane onto American soil. The agency has drawn up guidelines that call for isolating people who might have been exposed to the disease.
Since the start of the outbreak two years ago, there have been 160 suspected MERS cases in 35 states, says David Swerdlow, who leads the CDC's MERS response team. All of the individuals tested negative.
"So far we've been very lucky," he tells Shots. "But we are vigilant. We are preparing, and we are always watching for possible cases."
The CDC has sent out guidelines to local health departments on MERS. It is also offering assistance in testing for the virus.
If a case does turn up in this country, Swerdlow says, medical investigators should check on everyone with whom that person had been in close contact over the past two weeks. That list includes airline passengers if the person flew to the U.S.
"We don't think that everyone on a flight is necessarily at risk," he says. But efforts would be made to contact every passenger, to see if any have fallen ill: "If there ever were a case, we would probably look at everybody on the flight."
Researchers believe the MERS virus resides in camels. Somehow the virus recently started to jump over to humans. During the early days of the MERS outbreak, most of the cases were in people who work with camels, had drunk milk from camels or eaten camel meat. But now there's been a shift and the virus is being seen in people who've had no exposure to camels but rather exposure to someone already sick with MERS. Clearly the virus is moving from one sick person to another human; often nurses and other health workers.
Swerdlow at the CDC says so far the one positive thing is that there doesn't appear to be a chain of "sustained" human transmission. Right now the virus only moves to a second person and then it appears to stop. If the virus does mutate so that it does have sustained transmission — moving from person to person to person — MERS would then be positioned to be a major global threat. But the virus hasn't shown the ability to do that — at least not yet.
AUDIE CORNISH, HOST:
A deadly respiratory illness in the Middle East is raising concerns that it could turn into a global pandemic. MERS or Middle East Respiratory Syndrome had been simmering along for the last two years with just a few cases being reported each month. But this month new infections skyrocketed. This week alone, Saudi Arabia announced for than 60 cases. Most of those people are in hospitals. NPR's Jason Beaubien has more.
JASON BEAUBIEN, BYLINE: MERS is similar to the SARS virus. Back in 2003 there were fears that SARS was going to rampage around the globe and it ended up killing roughly 800 people in Asia before being brought under control. As with SARS, there's no vaccine for MERS, no cure. And MERS tends to kill 30 to 40 percent of the people who get infected. Until recently MERS seemed to be less virulent than SARS, sort of SARS's wimpy cousin. But then all of a sudden there's been a sharp uptick in the number of MERS cases.
Researchers believe the MERS virus comes from camels. Most of the first victims had had some contact with camels. Michael Osterholm is the director of the Center for Infectious Disease Research and Policy at the University of Minnesota. He says over the last few weeks something has clearly changed. The virus may be mutating.
MICHAEL OSTERHOLM: When that virus changes enough, instead of just the occasional animal-to-human transmission, once humans become infected they're now capable of transmitting to other humans. That's what will tip the balance. That is what will cause a worldwide outbreak. And we're very concerned with what we've seen over the past two weeks, that we may be at that point now.
BEAUBIEN: Many of the new cases are among doctors, nurses and other healthcare workers. One of the latest victims in Jetta was the receptionist at the local hospital. Tarkiasarovich, a spokesman for the WHO, says it's critical that clinics in the region tighten infection control procedures.
UNIDENTIFIED MAN: You see, it's not always possible to identify patients with MERS early.
BEAUBIEN: In some patients, it can resemble a bad flu, others have very few symptoms. Tarkiasarovich says hospital staff should be wearing masks and gloves with all patients until researchers figure out whether it's transmitted through the air or touch or some other way. So far, MERS has killed nearly 100 people, most of them in Saudi Arabia. New cases have also turned up recently in Greece, Malaysia, and the Philippines, but all of them are among travelers who picked up the virus in the Arabian Gulf.
The U.S. Centers for Disease Control and Prevention already has a MERS response team in place and they say at the outbreak it's quite like that someone will arrive with the virus. Jason Beaubien, NPR News, Washington. Transcript provided by NPR, Copyright NPR.