Passage: Buruli ulcer is an infectious disease caused by Mycobacterium ulcerans. The early stage of the infection is characterised by a painless nodule or area of swelling. This nodule can turn into an ulcer. The ulcer may be larger inside than at the surface of the skin, and can be surrounded by swelling. As the disease worsens, bone can be infected. Buruli ulcers most commonly affect the arms or legs; fever is uncommon.M. ulcerans releases a toxin known as mycolactone, which decreases immune system function and results in tissue death. Bacteria from the same group also cause tuberculosis and leprosy (M. tuberculosis and M. leprae, respectively). How the disease is spread is not known. Sources of water may be involved in the spread. As of 2018 there is no effective vaccine. The Bacillus Calmette–Guérin (BCG) vaccine has demonstrated limited protection.If people are treated early, antibiotics for eight weeks are effective in 80% of cases. The treatment often includes the medications rifampicin and streptomycin. Clarithromycin or moxifloxacin are sometimes used instead of streptomycin. Other treatments may include cutting out the ulcer. After the infection heals, the area typically has a scar.About 2,000 cases are reported a year. Buruli ulcers occur most commonly in rural sub-Saharan Africa and Australia with fewer cases in South America and the Western Pacific. Children are most commonly infected in Africa, while adults are most commonly affected in Australia. Cases have been reported in 33 countries. The disease also occurs in animals other than humans, though no link between animal and human infection has been established. Albert Ruskin Cook was the first to describe buruli ulcers in 1897. It is classified as a neglected tropical disease.

Question: Was an effective vaccine found prior to 2016?
As of 2018 there is no effective vaccine