South Korea plans to ship almost 1.6 million doses of AstraZeneca’s coronavirus vaccine to Vietnam and Thailand this week, the foreign ministry announced Tuesday, as the Southeast Asian nations struggle to contain the spread of the virus.

The donation comes as South Korea’s vaccination program has accelerated rapidly, with 70 percent of the population expected to be inoculated by the end of the month.

In Guatemala, shortages of syringes have slowed vaccination efforts. In Haiti, logistical and security challenges after the devastating Aug. 14 earthquake have contributed to making it the country with the lowest vaccination coverage in the world.

And across the Caribbean, countries are grappling with unequal distribution of doses and vaccine hesitancy, World Health Organization officials warned today in an online news conference.