Take steps to prevent swimmers' itch
Every summer I see a bunch of kids in the office following a trip to a
picturesque inland lake who come in itching and rashy with red pimples and welts
everywhere, especially in areas where they were in prolonged contact with lake
water. This is swimmers' itch.
Swimmers' itch is a rash caused by an allergic reaction to a
parasite found in bird poop that will burrow under the skin of humans even
though we aren't a good host. The parasite causes the body to respond
aggressively to try to expel it and that response causes the intensely itchy
rash. Because the parasite lives in shallow water waiting for a good host, kids
are at particular risk. Children tend to play in shallow water, wading for
longer periods of time and as a result have a significant exposure to the
parasite. Adults can get it, too, but because we tend to be in the water for
shorter stretches of time and often will go out into deeper, clearer waters, our
exposure is less.
Preventing swimmers' itch can be difficult. Folklore about using Vaseline on
your skin before swimming, putting on bug repellent or coating the skin with oil
before entering the water have never been scientifically proven to make a
difference, although the idea of creating a barrier between the skin and
parasite does make sense. The best proven strategies to minimize swimmers' itch
are to roughly towel off after wading or swimming, to remove your bathing suit
as soon as possible to prevent trapped parasites from burrowing in and avoiding
areas with a lot of marshy plants or snails because these are areas with higher
concentrations of the parasite.
Once you have swimmers' itch, though, treating the symptoms is all you can
do. Using anti-itch creams like cortisone, taking oral Benadryl and sometimes
using an oral steroid like Prednisone can diminish the symptoms. Whether or not
you treat the symptoms it will take a few days to a week or more for the rash
and itching to resolve.
From The Detroit News: http://apps.detnews.com/apps/blogs/askthepediatrician/index.php#ixzz0ppULuDdM
What is "swimmer's itch" and how can I avoid it?
Swimmer's itch is a troublesome itching rash that can affect swimmers after
they emerge from the water. The rash is caused by penetration of a tiny larval
parasitic flatworm that normally resides in waterfowl and a certain species of
aquatic snail. The burrowing parasite quickly dies, but the body remains at the
site and can be the stimulus of acute inflammatory reaction. Like any allergic
reaction, the degree of discomfort and bodily reaction differs with the
sensitivity of the individual and degree of infestation. In some people,
considerable pain, fever and severe itching may result along with noticeable
swelling of affected areas. Some bathers appear to be immune. Welts normally
disappear within a week but red coloration may persist some time longer. The
inflamed areas resemble chigger bites, but differ in distribution on the body.
Chiggers tend to attack the legs, groin, waistline, and underarm areas, whereas
swimmers' itch can be distributed over any exposed area of the body. Swimmers'
itch does not produce watery blisters like poison ivy, does not spread from the
point of penetration of the parasite, and is not contagious like bacterial
infections.
Outbreaks of swimmers' itch are related to the distribution of infected
waterfowl and vary from year to year in any water body, but are generally most
common in July when snail infections mature and parasite production increases.
Hot weather can contribute by speeding development of the parasites.
Infestations often disappear later in the summer when the snail host dies out.
Extensive control measures using toxic chemicals are possible but usually not
warranted. Individuals can control the effects of exposure by rubbing exposed
surfaces of the body briskly with a towel after leaving the water. Bathers who
remain in the water and follow this procedure upon leaving fair better than
those who enter and leave the water frequently or are playing intermittently in
shallow water. Taking a shower in water different from the lake water as soon as
possible after leaving will also help. These procedures crush or remove the tiny
parasites from the skin before they can penetrate the body.
http://www.in.gov/dnr/fishwild/3617.htm |