The United States has started shipping 3.2 million doses of Johnson & Johnson's Covid-19 vaccine to the Philippines, the White House has said, as Washington continues its coronavirus diplomacy by sharing doses with developing nations, Reuters reports.

"We are beginning to ship over 3.2m doses of J&J to the Philippines today," White House spokesman Kevin Munoz said on Twitter.

The Philippines so far has administered at least 13,442,299 doses, enough for just 6.2 per cent of its population based on a two-dose regiment, according to Reuters data. It has registered 1,485,457 infections and 26,232 coronavirus-related deaths since the pandemic began.