Sexually Transmitted Diseases Handbook

There are quite a lot of different ways of transmitting diseases: some bacteria are carried by vectors, such as snails or mosquitoes, and can have quite complex life cycles. Some can live outside their hosts for some time, at least in the form of spores, and so can be picked up at a later date. Some “very infectious” disorders can be carried in the breath so no direct contact is necessary. Most of the bacteria and viruses which cause disease live in the body fluids, however, and are therefore most easily transmitted by any activity which involves close contact: the...