The choice comes as a rising variety of nations look into utilizing totally different Covid-19 vaccines for first and second doses amid provide delays and security considerations which have slowed their vaccination campaigns.
A well being official stated the trial will embrace round 500 army personnel who have been vaccinated with a primary dose of AstraZeneca’s Covid-19 shot.
The examine will look at T cells – immune cells that may destroy virus-infected cells – and neutralising antibodies in those that got a mixture of doses, the well being official informed reporters.
The timing and the scale of the examine has not been determined, the well being official stated, however will contain a various age group.
South Korea’s vaccination marketing campaign has been hampered by international shortages and cargo delays, deepening public scepticism over Seoul’s purpose of reaching herd immunity by November.
It has given first doses to simply over 7% of its 52 million inhabitants, the Korea Disease Control and Prevention Agency (KDCA) knowledge confirmed on Thursday.
KDCA reported 646 new confirmed circumstances of the coronavirus as of Wednesday midnight, bringing whole infections to 134,117, with 1,916 deaths.