Long research, but no cure
There is no guarantee for finding the cure: While the infectious agent has been identified for all diseases below, the search for effective vaccines is still ongoing.
Diagram showing length of search for a number of diseases, where no fully working vaccine has been found so far.
Research for a malaria treatment started in 1880, for tuberculosis in 1992.
Similarly the search for a vaccine for dengue fever started in 1907.
