1. avoid Swimming for long periods in Shallow water
2. avoid Swimming in areas where Swimmer's itch is a problem and where there is an onshore wind
3. Towel off immediately after leaving the water may help reducing Swimmer's itch caused by cercariae of some species that enter only as the water dries on the skin
4. post appropriate signs on beaches where Swimmer's itch is an annual problem
5. do not encourage birds to stay in your area by feeding them
6. avoid placing rip-rap on your shore. This provides an excellent surface for certain species of snails to attach their eggs. The higher the number of snails, the greater the chance for Swimmer's itch.

Birds can be checked for avian Schistosomes by hatching the Miracidia from Parasite eggs in the hosts' feces.

If hatch-year (young birds) that can't fly are positive for avian Schistosomes, then it must be concluded that they contacted the Parasite on that specific lake.

Not only can the bird species of Dermatitis-producing Parasite be isolated, but it is possible to determine the level of infection.

This is done by weighing the fecal content and then counting the number of Miracidia that hatch from one gram of feces.

It is important not only to know what bird species serve(s) as hosts, but also the level of infection.

To pinpoint the bird host even further, it is possible to take the Miracidia that hatch from the feces and expose suitable lab-reared Snails to see if they get the infection.

If the cycle can be reared in the laboratory, cercariae from the lab cultures can be compared to those that emerge from naturally-Infected snails taken from areas on the lake where Swimmer's itch was a problem.

The behavior, size, and Morphology of each species of avian schistosome are unique to each species.

The following are factors that may determine whether Swimmer's itch may be a problem on a specific lake at a given time:

1. distribution and number of snails that can serve as intermediate hosts
2. distribution and number of bird hosts that can serve as hosts for the adult worm
3. Wind direction
4. Water currents
5. number of hours that people stay in the water
6. time of day
7. Sensitivity of the individual to Swimmer's itch.

All of these factors can change on an annual basis.

The Causative agent for Swimmer's itch is the larval, free-living and Aquatic stage of a group of flatworms that are called Schistosomes. Most of species that cause Swimmer's itch use bird hosts for the adult parasite and aquatic Snails as intermediate hosts for the larval stages. The life history of the Dermatitis-producing worms is cyclic.

Eggs released from the adult worms that reside in the Blood Vessels (usually veins around the intestine) of the bird host, make their way into the Digestive Tract of the bird and then pass out of the host with the feces. If the eggs are deposited in water, they will hatch within an hour if conditions are right. The Miracidium, an Aquatic stage, is Free-swimming, but Nonfeeding. It has enough energy to keep it moving for about a day. Once the Miracidium comes in contact with the proper Snail it will either penetrate into the Snail via the integument or it may enter through its mouth. Within the Snail, the Miracidium will elongate to form a reproductive sac called the Sporocyst. This germinating structure will produce a second generation of Sporocysts. In approximately a month, the Sporocysts produce another stage, called the cercaria. This stage burrows out of the Snail, becomes a second type of Nonfeeding, swimming Aquatic stage that must enter the bird host. It does this either by penetrating the skin of the bird or by being ingested and then entering the Blood Vessels in the walls of the pharynx or esophagus. In the bird host, the parasite migrates through various organs of the bird and finally matures in the Blood Vessels. The adult worms then begin producing large numbers of eggs which again are voided with the feces. Avian Schistosomes usually complete their life cycle in two months, however, the specific time varies with each species.

No, a Papule forms only where a cercaria has entered the skin of a person.

If the person gets exposed to more Cercariae, additional Papules will form.