Table of Contents
Introduction
Swimmer's itch, also called cercarial dermatitis, is caused by tiny parasites on birds and animals. People can get sick if they swim in rainwater or saltwater that has infected snails. The parasites like to live on birds and other animals, but if they touch a swimmer, they crawl into their skin and cause a rash.
What Is a Swimmer’s Itch?
Swimmer's itch (cercariae dermatitis or schistosome dermatitis) is an allergic rash resulting from the invasion of cercariae (small parasite larvae) into your skin. Those bad freshwater snails or brackish water snails release these parasites. Infected birds or mammals, such as ducks, geese, muskrats, or raccoons, breed in the water. They do not use humans as their natural hosts, so the larvae do not survive long. They, however, not only make you very itchy but also stick to your skin.
Which Parasites Are Responsible for Swimmer’s Itch?
It is caused by cercariae, which are small parasitic larvae. They are ciliary stages of human-affecting trematodes (parasitic flatworms) of some free-swimming species of the family Schistosomatidae. They greatly infect ducks, geese, gulls, beavers, muskrats, foxes, and other mammals. Those that mainly cause local outbreaks are a bird schistosome species known as Trichobilharzia franki. The species is said to cause cercarial dermatitis in humans. Human beings are not supposed to be the hosts of these cercariae, and even though they may be able to enter the human skin temporarily, they quickly die away, but not before you suffer a severe allergic reaction. When these undesirable visitors appear, your immune system reacts by giving out the regular rash and itching.
How Does a Swimmer’s Itch Spread?
A swimmer's itch may be contracted in several ways; nevertheless, an individual cannot contract the virus merely by touching an individual who already has the virus.
1. Muskrats, raccoons, ducks, geese, and swans are all domestic animals in which adult parasites have been found in the blood. They also lay eggs in water, where they reproduce through pooping.
2. The eggs develop into larvae that attack the bodies of specific snails (saltwater or freshwater). They grow in the snail, mature to their cercaria form, and are released into the water, where they swim near the top.
3. Cercariae are most commonly observed in birds and mammals but might sometimes penetrate human skin. This is more probable in warm, shallow seas along coastlines, where larvae are common.
4. Humans cannot act as carriers of the parasites because they will not develop in human tissue and are likely to perish in the skin within 24 to 48 hours.
5. Repeated exposures are likely to result in responses that become quicker. Further exposures will cause itching at a slower and larger rate due to sensitization of the immune system.
6. Cercariae can live only 24 hours or more in water, but when an infected snail is present, cercariae generation starts, and the cycle of life changes among the snails, birds, and mammals.
The condition is not infectious. It does not possess an infectious nature. It is not contagious, so a person can never get it from an infected person.
Who Is at Highest Risk of Getting Swimmer’s Itch?
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The children are the most at risk, as they commonly play in shallow waters where the parasites feed, and after a swim, they do not towel-dry themselves.
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Most people who spend much time in natural water, especially hot and shallow beach places, are likely to be exposed.
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Common among morning swimmers, the larval form of the parasite (cercariae) is usually released in the morning and during sunny days, making it a dangerous time of day.
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You are also at a higher risk of injury if your line of work involves constant contact with the water, such as working on rice paddies or lifeguarding. As long as there is touch, there are chances of irritation.
Common Signs and Symptoms of Swimmer’s Itch Rash
1. Skin Rashes With Itching Bumps
Soon after swimming, you might develop some small, raised red bumps or papules on your skin, particularly in places in direct contact with the water. The bumps may resemble those caused by an insect bite, and they usually begin to appear several hours or days later.
2. Pain-Like Sensations, Including Tingling, Burning, or Itching
Before you develop the bumps on your skin, you can experience tingling, burning, or itching. This usually begins a few hours after contact, but sometimes it takes up to two days.
3. Exposed Skin Rash, Which Is Only Directly Exposed
Skin not covered in clothes, such as legs, arms, and shoulders, tends to be exposed to the rash alone. Regions covered by swimsuits are always spared.
4. Health Danger and Recurring Pain
Preferably, avoid scratching since such bumps tend to get infected once more in the event of scratching. In addition, repeated exposure to repeated instances of swimming in the same lake (repeated exposure) can worsen the reaction, with more bumps, more itching, and an accelerated start time taking place.
What Are the Diagnostic Methods of Swimmer's Itch?
If you get a rash soon after swimming or walking in a natural body of water, especially in places not covered by swimwear, your doctor can quickly figure out what's wrong. As a rule, it's based on the typical symptoms and the amount you've been exposed to.
Laboratory Test
No special test for swimmer's itch can be done on blood or urine. As long as the doctor isn't looking for something more critical, even skin biopsies (diagnosis of skin tissue) usually don't help.
Physical Examination
The following are what the doctor will be looking for in the exam:
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Uncovered skin will become covered with tiny red spots or swollen papules, which can become blisters.
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Scratching or burning of the underskin and marks of rash only on the places that were touched by the water
How Is a Swimmer's Itch Treated?
The generally expected remedy is that the swimmer's itch goes away in a week or two, and the primary aim of any treatment is to stop the pain, such as burning, itching, and rash.
The following are some of the most critical categories of medicines that will be utilized during the treatment of the diseases:
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Hydrocortisone creams reduce swelling and itch. They are very good to apply when the rash is aggravating.
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The ancient cure is calamine lotion or anti-itch cream to cool and abate the crimsonness on areas of your body where you cannot resist this impulse.
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The antacids work outwardly with the help of mouth antacids like Benadryl and Claritin. They work best when taken at night to ease sleep, although you may feel like going to sleep, especially with the ones containing Benadryl.
Alternative methods of doing it are
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Cold Packs: Place a cloth that is not frozen but cold on a part, or place an ice pack enclosed in a piece of cloth on the part immediately. Do that a few times a day.
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Baking Soda: Create a baking soda mixture by dissolving it in water to obtain a paste. It is a perfect treatment to reduce irritation and to clean up blisters.
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A Colloidal Oatmeal Bath: Some individuals adore having a bath in colloidal oatmeal. They wipe the fabric on it and apply it to the skin, which helps with itchy attacks.
How to Prevent Swimmer’s Itch?
Prevention of swimmer's itch involves the following:
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Avoid contact with water bodies that contain weeds, waterfowl, snails, or shallow, warm, or marshy waters that could contain the parasite.
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Since sand, algae blooms, and scum are excellent breeding grounds for the parasite, be sure to choose your swimming location carefully and avoid swimming in unclear water.
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Swim in open waters, not close to the shore. Shallow, warm water has a concentration of parasites.
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You should not swim during the onshore winds, as the parasites are blown onto the shore. Choose a later time of day (evening or afternoon, when there is a lesser probability of coming in contact with the parasite).
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Immediately wash exposed body parts with clear water and towel dry, especially the areas at the back of the knees, underarms, and as much as possible around the inside edges of swimsuits.
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Always wash the swimsuits that have been used to remove the parasites.
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One should also avoid feeding birds in swimming areas, as this will invite waterfowl to feed on the bird food, and these birds are the carriers of the parasites.
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Wearing protective gear such as waders, rash guards that cover tightly, or a full-body swimsuit could create an obstacle to prevent parasites from attaching to the body.
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Using mineral-based waterproof sunscreen will protect the skin from parasitic invasion.
All these precautionary steps are sufficient to reduce the risk of swimmers' itch during water sports activities. Outbreaks and their control are also established by reporting cases to the local health authorities.
Conclusion
Swimmer's itch causes harm to individuals participating in open-water activities. Areas with onshore winds and shallow water pose significant hazards for swimmers' itch. The main biological factors include snail density, cercariae migration, and the cumulative probability of cercariae contacts. From a public health perspective, people should avoid places with shallow water and consistent onshore breezes. If people continue to choose such locations, the less often they do so, the better.
A Key Takeaway From iCliniq
Swimmer's itch may be excruciating, yet there is good news. It is not harmful, but it would be painful or unpleasant to you. The itchy skin and the rash will disappear in a week or two. Do not scratch, as it makes you contract infections. You can treat it with cold packs, oatmeal baths, and creams that prevent itchiness at home. And when you do not know what to do and need medical advice, they are all readily available at iCliniq. They can give you anything ranging from soothing talk to prescription decisions in case you need them.
