“If people still choose to use the lakes when warnings are in place, or any other lake where there are visible changes to water colour, they should shower and change their clothing as soon as possible afterwards, even if no symptoms are noticeable.”
Cyanobacteria can release toxins that can trigger asthma and hayfever symptoms, skin rashes, stomach upsets, and in some cases neurological effects such as tingling around the mouth, headaches, breathing difficulties and visual problems.
Symptoms might not appear until some time after contact with the affected water.
Scums are a particular risk because they contain a high level of toxins. If contact with scum does occur, skin should be rinsed clean and clothing changed as soon as possible. This warning is particularly important for children.
Dog owners should prevent their dogs from drinking or swimming in the water, as dogs are particularly sensitive to cyanobacteria.
Te Whatu Ora’s Public Health Unit for Waikato would like to be informed about health problems that develop after exposure to any of the Waikato lakes. Phone the Waikato Public Health Service on 07 838 2569.
Up-to-date information on cyanobacterial health warnings is available by visiting the Land Air Water Aotearoa (Lawa) website at https://www.lawa.org.nz/explore-data/waikato-region/.
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