The U.N. health agency said its global rollout of coronavirus vaccines remains unaffected even as a growing number of countries, especially in Europe, suspended use of AstraZeneca’s vaccine on Monday amid concerns about blood clots in some people who received it.

Ghana has become the first country in the world to receive vaccines acquired through the United Nations-backed COVAX initiative with a delivery Wednesday of 600,000 doses of the AstraZeneca vaccine made by the Serum Institute of India.