According to the International Journal of Herbs and Pharmocological Research:
ANTIBACTERIAL ACTIVITIES OF DIFFERENT SOLVENT EXTRACTS OF CARICA PAPAYA FRUIT PARTS ON SOME GRAM POSITIVE AND GRAM NEGATIVE ORGANISMS
1Orhue P.O. and *2Momoh A.R.M.
In this research where a petroleum extract of papaya leaf was compared to two common antibiotics, Perflacine and Cefuroxime on bacterial organisms S Aureus, E-Coli, and P aeruginosa, papaya leaf was found to be more powerful.
Their chart below