This post has been updated with an addendum.
Anvisa (Agência Nacional de Vigilância Sanitária, or the National Health Surveillance Agency), have approved the use of a homeopathic medicine to treat sufferers of dengue fever in Brazil. So says this story from Estadao (rough translation here), as well as this earlier news bulletin from Paraguayan agency La Nacion (rough translation here). The latter report claims that a study has shown the remedy to “reduce the number of cases of dengue by 80%”. The scientist quoted in the report is a chap by the name of Renan Marino.