1.   Deadly parasite or harmless algae in Sydney water?

2.   Some scientists have argued that the bugs are harmless algae mistaken for the dangerous parasites, but the water company has denied that.

3.   There has been no statistical increase in illness during the latest Sydney outbreaks, and some scientists have argued that the bugs are harmless algae.

4.   There has been no statistical increase in illness during the Sydney outbreaks, and some scientists have argued that the bugs are harmless algae.

5.   There was no big increase in illness during the Sydney outbreaks, and some scientists have argued that the bugs it contained were harmless algae.