The risk is going to be extremely low compared to the very real risk of West Nile virus.

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[PBO is classified as a carcinogen,] but it's not truly one in its own right, ... It inhibits the metabolism of certain types of chemicals in insects. For human and mammalian species it can help promote cancer - but only in large doses over a long period of time.

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The real, measurable risk of West Nile far outweighs the predicted risk of these chemicals, but that doesn't mean the perception of risk isn't there.

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