"We are working hard with AstraZeneca and with our scheduling and we are about to reschedule about 16 million doses to try and cover those second doses" to be shipped out in late June and early July, he said.
Africa has officially registered over 4.8 million cases and 130,000 deaths, according to the WHO, representing 2.9 percent of global cases and 3.7 percent of deaths.
Last week, the EU drugs regulator authorised Pfizer and partner BioNTech SE's COVID-19 vaccine for children as young as 12. Its previous guidance was for adults aged 16 and above.
Studies show most under-20s who catch COVID-19 have only mild symptoms, but risks increase among those with underlying conditions such as neurological and pulmonary diseases, the ECDC said.
The B.1.617 variant of the coronavirus was first detected in India last year and has been blamed for much of a devastating Covid-19 wave that has battered South Asian nations in recent weeks.
"Vietnam has uncovered a new COVID-19 variant combining characteristics of the two existing variants first found in India and the UK."
The World Health Organization (WHO) has identified four variants of SARS-CoV-2 of global concern. These include variants that emerged first in India, in Britain, in South Africa and in Brazil.
Iran, the Middle Eastern country by COVID-19, has complained that US sanctions were preventing it from making payments to buy vaccines.
Ardakanian said the payments would go towards the purchase of vaccines from the World Health Organization (WHO) - sponsored global COVAX vaccine-sharing plan, state news agency IRNA reported.
The B.1.617 variant contains two key mutations to the outer "spike" portion of the virus that attaches to human cells, said senior Indian virologist Shahid Jameel
Procurement and delivery of the vaccine is subject to Sputnik V receiving an emergency use listing from the World Health Organisation, a decision which the RDIF said is expected soon.
The WHO has received information from unofficial sources that the B.1.617 variant has been found in seven further territories, figures in the UN health agency's weekly epidemiological update showed, taking the total number to 60.
"In this way Sweden contributes to more than our share of the EU's target of donating at least 100 million doses to low- and middle income countries in 2021," the government said in the statement.
Sweden said earlier in May it would donate 1 million doses of AstraZeneca vaccine to COVAX.