From http://www.landmannalaugar.info:

Parasites in the pool

Some years ago parasites have been biting bathers (almost nothing in summer 2005). Late August and September were the worst times (hardly og not noticed in the early summer). Scientists do not agree on how serious the bites can be. Most mean that they are only harmful to birds, but some fear that the parasites also can adapt to the human body (use the neuro system). We are waiting for official researches.

Do anybody know about the current situation?