Human challenge trials aren’t newHuman challenge studies are nothing new in the field of medical science, with the first experiment – assessing whether a method of vaccination, called variolation, could prevent chickenpox – dating back to the 1700s. And with rapid immunisation taking place (in the UK and several other countries), there are questions around the need for challenge studies. Considering that the planned study will use the original version of the virus, it may seem fruitless to continue with human challenge trials. READ | Covid-19 vaccine and human challenge trials: Are they ethical? READ | Scientists to discuss Pfizer/BioNTech vaccine lab study which found decreased protection vs variantREAD | Kids and Covid: What a new study found

Source: News 24 February 22, 2021 03:22 UTC