India is struggling to export its surplus of Covid-19 vaccines as logistical hurdles delay their use in many countries despite low levels of inoculation, vaccine producer the Serum Institute of India (SII) and a government official said.

The SII, the world's biggest vaccine maker that produces the AstraZeneca, Novavax and Sputnik Covid-19 shots, has already announced plans to temporarily halve output of the AstraZeneca drug until more orders came, including possibly through boosters, Reuters reports.

“All over the world, there is enough supply but it is getting the jabs in arms, which will take some time,” SII Chief Executive Adar Poonawalla told a virtual conference organised by the Confederation of India Industry.