For example, the parasitic infection toxoplasma, which is contracted by eating
undercooked meat, is prevalent throughout Europe. This infection causes small cysts to develop within
our body, particularly within the brain and these again cause no problem unless there is severe immunosuppression
which allows them to re-emerge. This again, is a major cause of morbidity and mortality in AIDS.
In summary, new diseases are indeed a true rarity and most of the apparent new conditions are more a natural
adaptation of these micro-organisms to the environments that we create for them - either knowingly or unknowingly,
but often inevitably to our detriment.