It is safer to swim in water that is well chlorinated, this usually means well maintained swimming pools. If you are travelling to Africa, the biggest risk is a disease called Schistosomiasis which is also known as...

Mosquitoes, certain types of flies, ticks and bugs can cause transmit serious disease. e.g. malaria, dengue fever, yellow fever. Some bite at night, but some during daytime, so protection is needed at all...