[forkexec]

Camostat plus E-64d was proposed in a paper in Cell around March 5 as a potential superior prophylaxis under investigation because it blockades the virus from using either ACE2 or TMPRSS2, completely denying SARS-CoV-2 from entering human cells.

It's not a vaccine but it seems possible to prevent infection and possibly halt illness. That is, if it doesn't have any yet unknown, horrible side-effects.