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Red alerts for blue-green algae have been issued for several dams across the Central West in the past month.
People have been advised to avoid recreational activities, including swimming, waterskiing and canoeing, at dams where a red alert has been issued.
So just how great is the risk?
Dr Grant Douglas is a Senior Principal Research Scientist in the CSIRO's Contaminants and Biotechnology Program. He caught up with Alex James.
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