Posted on 14th January 202125th May 2021 by acutecovidCOVID Microbial Therapy Review (24-48 hours) COVID Microbial Therapy Review (24-48 hours) Review of progress and improving clinical state should include further rationalisation of unnecessary medications including antibiotics if ‘Procalcitonin’ is negative and clinical state deems appropriate.. Last updated: December 2020.