Two months after India dropped local trial rules for Covid-19 vaccines approved by developed countries, not a single dose has arrived as New Delhi dithers over legal protection sought by companies like Pfizer and Moderna.

The US has in recent weeks donated millions of vaccine doses to countries such as Bangladesh, Bhutan and South Korea. Supplies to India, however, are stuck pending conclusion of some "legal requirements", according to the global Covax vaccine platform through which such doses are routed.

India's drug regulator gave emergency use authorisation to the Moderna vaccine in June, as the US readied donations for India. Fellow US companies Pfizer and Johnson & Johnson have not formally sought permission for the use of their shots in India.

But India has not met requests for granting the manufacturers indemnity from lawsuits.

Read the full Reuters story here.