Rabies
There is no cure for rabies. There is a vaccine (medicine to try to prevent rabies) against it. The vaccine was first developed by Louis Pasteur and Pierre Paul Émile Roux in 1885. This vaccine used a live virus grown in rabbits, and weakened (through drying it). The first person to be vaccinated was Joseph Meister (a 9-year-old boy who had been bitten by a dog). Vaccines similar to this are still used today, but other vaccines (growing the virus using cell cultures) are more used. Some vaccines are made with bird embryos.