The link Eddy gave you is for the Mac forum section

Why so quick to delete file(s) from quarantine?
Files in quqrantine can not harm your computer

Clean, Quarantine, or Delete? >> https://www.lifewire.com/clean-quarantine-or-delete-3972276

Avast Mac Security 2015: Using the Virus Chest >> https://www.avast.com/faq.php?article=AVKB221#artTitle

Everything comes up under the Virus Chest menu, but when I select files and choose delete I get a pop up saying "Restore infected items?"
See reply from[b] @Tumic[/b] https://forum.avast.com/index.php?topic=197288.msg1369257#msg1369257