Drugmaker AstraZeneca has said it is scouring its supply chain to find more doses of its Covid-19 vaccine for Southeast Asia, which is facing its most serious outbreak yet of the virus, AFP reports.

By the end of July AstraZeneca will have delivered 11.3 million doses for Thailand, according to James Teague, AstraZeneca's representative in the country.

“We are delivering in the fastest possible timeframe, however, given the gravity of the Delta variant, we are leaving no stone unturned to accelerate supply further still,” Teague said in an “open letter to the people of Thailand”.

“We are also scouring the 20+ supply chains in our worldwide manufacturing network to find additional vaccines for Southeast Asia, including Thailand.”