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Caution advised over swimmer’s itch

Caution advised over swimmer’s itch

Members of the public are being advised to exercise caution when in contact with shallow water following two reports at the south end of Lake Taupo to Toi Te Ora – Public Health Service (Toi Te Ora) of allergic rash.

Medical Officer of Health, Dr Jim Miller says, “Although not confirmed, it is possible these may be cases of cercarial dermatitis, also known as ‘swimmer’s itch’ or ‘duck itch’. This is caused by exposure to tiny larvae or cercariae in the water, most commonly found in shallow and relatively warm areas.”

The larvae can cause an allergic irritation of the skin which is generally minor and self-limiting, however, if the rash is extensive or does not improve for more than a few days, seek medical advice.

“Any irritation should run its course, but can usually be easily treated with soothing antihistamine or steroid creams. Always see your doctor if symptoms persist,” says Dr Miller.

The larvae are part of the life cycle of parasitic worms, which involves ducks, other birds, and snails. ‘Swimmer's itch’ occurs when a film of cercariae-infested water dries on exposed skin, and, for humans, is a case of being in the wrong place at the wrong time.

The presence of the larvae is not something that is monitored, but you can reduce the risk of being affected by avoiding shallow areas of water, particularly where there is vegetation and/or evidence of bird life. Toi Te Ora has erected signage around the currently affected area advising the public.

Dr Miller says, “In the meantime, it’s suggested people take a precautionary approach and avoid contact with areas of shallow water, particularly around vegetation and where birds are evident. Washing or showering with clean water and drying yourself off with a towel after swimming can also help.”

For further information see these channels:

- Website: http://www.ttophs.govt.nz/recreational_water
- http://dermnetnz.org/arthropods/swimmers-itch.html
- Twitter: www.twitter.com/ttophs
- Email alerts for subscribers: www.ttophs.govt.nz/alert
- Signage at locations

ENDS

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