PrEP RCT showing HR 0.73, p
= 0.12. Trial halted after 47% enrollment, p
< 0.05 will be reached at ~75% enrollment if similar results continue.
HR 0.66/0.68 for full medication adherence, 0.72/0.74, p
= 0.18/0.22 overall (1x/2x dosing). Efficacy for first responders was higher, OR 0.32, p
= 0.01. First responders had a much higher incidence, allowing greater power, and reducing the effect of confounders such as misdiagnosis of other conditions or survey issues.
Performance is similar to placebo for the first 3 weeks. The effect may be greater with a dosage regimen that achieves therapeutic levels faster [tandfonline.com]
. ~40% of participants suspected they might have had COVID-19 before the trial, the effect in people without prior COVID-19 may be higher.
- the trial was underpowered
- investigation into more frequent dosing may be warranted
- insufficient dosing with no participants achieving more than the in vitro
Internet survey RCT subject to survey bias. There were no deaths or ICU admissions. Low risk healthcare workers, median age ~40. 494 1x/week dosing, 495 2x/week dosing, 494 control participants (1x and 2x participants received the same overall dosage). COVID PREP. NCT04328467
Rajasingham et al., 9/21/2020, Randomized Controlled Trial, USA, North America, peer-reviewed, 22 authors, trial NCT04328467