By far the largest epidemic is going on inside hospitals and other health
care facilities. The staph bug causing these infections resists treatment with
a broad range of antibiotics. Because it attacks so many people with weakened
immune systems, hospital-acquired MRSA accounts for the vast majority of fatal
But another, unrelated strain of MRSA is circulating in communities across
the U.S. This strain is resistant to first-line antibiotics.
News that MRSA is now killing at
Americans each year has focused public attention on
community-acquired MRSA. Where does it lurk? WebMD asked epidemiologist Jeff
Hageman, one of the scientists tracking MRSA at the CDC.
"We see outbreaks in settings where there is crowding, a lot of skin contact, and, often, a lack
of good hygiene," Hageman tells WebMD.
Hot spots for these outbreaks have been:
Interestingly, Hageman says day care centers have not been hot spots for
"It is kind of surprising to us that we have not received many reports
of MRSA in day care," he says. "We hear lots of reports of MRSA in
children, but not associated with day care. One reason is that day care centers
already have policies in place to handle a wide variety of diseases. Those same
policies would prevent MRSA infections."
Hageman says outbreaks happen when a person with an MRSA infection comes
into direct skin-to-skin contact with another person -- or after a person uses
a towel or other object that's been contaminated by an infected person.
But you can't avoid MRSA by avoiding so-called hot spots.
"Staph is found anywhere. One in three people carry staph on their skin.
They can spread infections anywhere in the community," Hageman says.
The Main Hot Spot for MRSA
Why do so many people carry staph germs? Because the human body is the staph
bacterium's natural habitat, says Gordon Dickinson, MD, chief of infectious
diseases at the University of Miami and the Miami VA Medical Center.
"We are the ecology," Dickinson tells WebMD. "Humans are the
ecological niche for Staphylococcus aureus. MRSA is just a
This means the No. 1 hot spot for MRSA is: your nose.
"It can live in moist areas of the skin -- like under the arms, in the
groin -- but you find it mainly inside the front of the nose," Dickinson
Whose nose? There's a very good chance it's your own.