The highly adaptable nature of viruses is one of their most dangerous strengths. They are programmed to survive at all costs, mutating into different forms that often make the leap between different species. The infamous Ebola virus, which has infected almost 15,000 people in Africa this year, first evolved in monkeys and then evolved into a form which could be transmitted to humans.
Mammal to mammal transmission is not a huge leap to make, however, as the physiology involved is similar in each species. But could viruses that affect totally different life forms, such as algae, possibly evolve into a variety that could threaten humans?