There are a number of positive results from various clinical studies on the effect of papaya leaf juice on Dengue Fever:
1. https://clinicaltrials.gov/ct2/show/NCT02016027
3. http://www.openaccessscience.com/pdf-files/vol2_4_dec2012/IJMAP_2_4_4_Carica_papaya.pdf
4. http://slctr.lk/trials/110%20%
5. http://www.jcbsonline.ac.in/Articles/12.%20Case%20report%201%20final%20print.pdf
6. Review of seven clinical studies
http://op.niscair.res.in/index.php/IJNPR/article/download/13529/969
And now a clinical study on Microlab’s nutraceutical pill, Caripill:
https://ayurajan.blogspot.com/2015/09/caripill-pill-with-papaya-leaf-extract.html?m=1
The Julia Ruffin Project promotes papaya leaf for its effect on disease.