With summer days at the beach on the minds of
millions of winter-weary people, a new study provides health departments with
information needed to determine when levels of disease-causing bacteria in
beach sand could pose a risk to children and others who dig or play in the
sand.
The
report appears in ACS' journal Environmental Science & Technology. Tomoyuki
Shibata and Helena M. Solo-Gabriele explain that disease-causing bacteria from
sewage can cause skin infections and gastrointestinal (GI) disorders in people
who come into contact with contaminated water.
The
U.S. Environmental Protection Agency (EPA) has guidelines to determine when
microbe levels in water are high enough to pose an unacceptable risk of GI
illness for contact with both ocean water and freshwater.
Microbes,
however, tend to concentrate in higher levels in beach sand -- to the point
where one previous study found that the sand on one fingertip, placed in the
mouth, had enough germs to cause GI illness.
No
guidelines exist to determine when contact with beach sand might be too risky
for children and others who play in beach sand, digging in it or being buried
in the sand. The scientists set out to fill that knowledge gap.
The
scientists used millions of computer simulations and measurements of
disease-causing microbes at beaches in California and Florida to determine how
many bacteria would have to be present in beach sand to exceed the EPA's
guideline for water. In doing so, they established "reference levels"
for beach sand that correspond to the EPA risk guidelines for water.
The
focus of children at the beach environment is especially important, due to play
behavior at beach sites that would increase a child's exposure, the scientists
noted.
The
authors acknowledge funding from the National Science Foundation and the
National Institute of Environmental Health Sciences.
Source:
American Chemical Society
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