According to the Malaysian Ministry of Health, currently there is only neem research on cells (in vitro) and animals (in vivo) that have been infected with the hepatitis C, dengue and polio viruses. There has been no research on Covid-19. WHO also stated that there is no proven drug that can prevent or cure Covid-19.
More @ https://bit.ly/309cnjb (Google Translate).
(English version of “[SALAH] “Daun Mimba Dapat Menyembuhkan Covid-19”” https://bit.ly/3n0t7TI).