World Health Organization WHO http://www.who.int/mediacentre/factsheets/fs199/en/ WHO World Health Organization buruli ulcer page WHO Buruli ulcer World Health Organization buruli ulcer page WHO WHO WHO Buruli ulcers "Buruli ulcer (Mycobacterium ulcerans infection)" inglés Buruli ulcers WHO website over Buruli ulcus WHO http://www.who.int/mediacentre/factsheets/fs199/en/ Buruli ulcer disease Buruli Ulcer (Mycobacterium ulcerans Infection) WHO website over Buruli ulcus WHO fact sheet on BU revised in 2007 World Health Organization buruli ulcer page Buruli ulcers http://www.who.int/mediacentre/factsheets/fs199/en/ World Health Organization affecting rural communities in sub-Saharan Africa WHO World Health Organization http://www.who.int/mediacentre/factsheets/fs199/en/ WHO WHO WHO