Does Oxylic acid dribble harm brood?
I don't think any of the OA treatments can cause any harm to the bees.
I do vapor treatments if you are concerned about using dribble.
Not significantly, but it could chill the cluster due to introduction of moisture. Check out page 21 of this great resource: https://honeybeehealthcoalition.org/wp-content/uploads/2018/06/HBHC-Guide_Varroa_Interactive_7thEdition_June2018.pdf
Thanks, Debbie!