The University of Oxford has launched a study to assess the safety and immune response of the COVID-19 vaccine it has developed with AstraZeneca in children for the first time, it said on Saturday.

The new mid-stage trial will determine whether the vaccine is effective on people between the ages of 6 and 17, according to an emailed statement from the university.

Around 300 volunteers will be enrolled and first inoculations are expected this month, Oxford said.

The two-dose Oxford/AstraZeneca vaccine showed an efficacy rate of 70 percent in trials on adults. 

AstraZeneca has a target to produce 3 billion doses this year and aims to produce over 200 million doses per month by April.