In a first, which country has launched a new clinical trial that will assess the efficacy of a third ‘booster’ dose of seven different Covid-19 vaccines on patients’ immune responses?

In a first, which country has launched a new clinical trial that will

1.	In a first, which country has launched a new clinical trial that will assess the efficacy of a third ‘booster’ dose of seven different Covid-19 vaccines on patients’ immune responses?
A.	USA
B.	Japan
C.	UK
D.	France
E.	Spain
Answer» D. France