> Contact with sharks vs contact with mosquitoes, or with dogs, or anything else on that list?

Swimming with reef sharks vs taking a hike in a malaria infested jungle? Swimming with reef sharks please.

Certainly the amount of contact plays a roll. That's why dogs are so much higher than wolves for instance. But it's also true that most of the time people spend swimming around sharks, they don't get bitten. How the ratio of attacks to contacts compares between sharks and dogs or other animals I don't know; agreed that would be somewhat interesting!