As the population increases ad the global temperature warms, absolutely, as humans and other species in biology are coming into closer and closer contact. There are diseases waiting in the Amazon rainforest that have yet to be experienced by large scale humanity, and in the jungles of Asia and Africa. As food chains and habitats are disrupted, nature's own defenses and barriers against the spread of these diseases are also lessened.
As the biodivesity decreases because of human actions there could be a relationship between the two. As mentioned above if we destroy the habitat for certain animals then other animals either benefit or suffer. If the an animal benefits and it is a carrier of certain diseases then I guess it would be possible to see an increase in that disease.
Historically, diseases have often passed from animals to people. This happened, for example, with bubonic plague and smallpox. But I don't think you can call that biodiversity because rats and domestic animals aren't what we'd think of as biodiversity.
Some people say that reducing biodiversity puts us in danger because it reduces the number of plants and animals that we can use to get medicine from, but I don't think that's what you're talking about.
Those are the only connections I can think of.
Yes there is a link between biodiversity and human diseases.Biodiversity can be defined as the genetic variability and diversity of life forms such as plants,animals and microbes.The biotic diversity is associated with habitat diversity.Bodiversity loss is mainly due to rapid extinction of rate generated in recent times by human activities.Improper deforestrattion is bound to lead to a process of no return for trees.Biodiversity reduces medicinal plants which are medicinally important for us.
Mankind, throughout ages, encountered many of what scientists are calling "epidemiologic transitions".
For example, because of deforestations, the risk of the infection with malaria is increased; the responsible for spreding the disease being the increasing of the density of the transmitter of malaria, Anopheles darlingi mosquito, of course, the increasing of the amount of mosquitoes' bites.
Also, because of deforestation, the risk of Lyme disease spreading is higher. This aspect is due to the appearance of white mice which is the best tick-host, tick's bite being the cause of Lyme disease.