Leishmaniasis (from sand flea) might be fought by Vitamin D - several studies

• The role of vitamin D in the control of Leishmania infection Jan 2015 https://doi.org/10.1139/cjpp-2014-0372
• The Role of Vitamin D and Vitamin D Receptor in Immunity to Leishmania major Infection Oct 2011 https://doi.org/10.1155/2012/134645
• Serum 25-hydroxyvitamin D level and vitamin D receptor (VDR) polymorphisms in patients infected with Leishmania tropica: a case control study - Sept. 2019 https://doi.org/10.1007/s12639-019-01159-7 FREE PDF
• Vitamin D increases killing of intracellular Leishmania amazonensis in vitro independently of macrophage oxidative mechanisms - Sept 2020 https://doi.org/10.1017/S0031182020001791
• VitaminDwiki - Hypothesis: Leishmania parasitic infection can be reduced by Vitamin D – May 2015

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New York Times article on Leishmania - Dec 2023

• "He was prescribed a drug that required three injections a day for 20 days, each one agonizingly painful. Mr. Tilano, 85, had to make repeated expensive bus trips to town to get them. Then his kidneys started to fail, which is a common side effect of the drug, as are heart failure and liver damage."
• "Among the so-called “neglected tropical diseases,” many experts believe leishmaniasis is in a class of its own in terms of the lack of progress, in the 120 years since it was first identified, to help the two million people who contract it each year."