Photo taken on March 12, 2021 shows AstraZeneca/Oxford vaccines at a hospital in Caceres province in Spain. Spain on Monday joined other European nations, such as France, Italy and Germany, in suspending the use of the AstraZeneca/Oxford vaccine over fears that it could lead to blood clots. (Photo by Gustavo Valiente/Xinhua)

Maria Jesus Lamas, director of the Spanish Agency for Medicine and Health Products, speaks at a press conference at la Moncloa, Madrid, Spain, on March 15, 2021. Spain on Monday joined other European nations, such as France, Italy and Germany, in suspending the use of the AstraZeneca/Oxford vaccine over fears that it could lead to blood clots. (Photo by Borja Puig de la Bellacasa/Xinhua)

Photo taken on March 15, 2021 shows a press conference held at la Moncloa, Madrid, Spain. Spain on Monday joined other European nations, such as France, Italy and Germany, in suspending the use of the AstraZeneca/Oxford vaccine over fears that it could lead to blood clots. (Photo by Borja Puig de la Bellacasa/Xinhua)

Photo taken on March 12, 2021 shows an AstraZeneca/Oxford vaccine at a hospital in Caceres province in Spain. Spain on Monday joined other European nations, such as France, Italy and Germany, in suspending the use of the AstraZeneca/Oxford vaccine over fears that it could lead to blood clots. (Photo by Gustavo Valiente/Xinhua)

Photo taken on March 15, 2021 shows a press conference held at la Moncloa, Madrid, Spain. Spain on Monday joined other European nations, such as France, Italy and Germany, in suspending the use of the AstraZeneca/Oxford vaccine over fears that it could lead to blood clots. (Photo by Borja Puig de la Bellacasa/Xinhua)

Health Minister Carolina Darias speaks during a press conference at la Moncloa, Madrid, Spain, on March 15, 2021. Spain on Monday joined other European nations, such as France, Italy and Germany, in suspending the use of the AstraZeneca/Oxford vaccine over fears that it could lead to blood clots. (Photo by Borja Puig de la Bellacasa/Xinhua)

Photo taken on March 12, 2021 shows AstraZeneca/Oxford vaccines at a hospital in Caceres province in Spain. Spain on Monday joined other European nations, such as France, Italy and Germany, in suspending the use of the AstraZeneca/Oxford vaccine over fears that it could lead to blood clots. (Photo by Gustavo Valiente/Xinhua)

Photo taken on March 12, 2021 shows AstraZeneca/Oxford vaccines at a hospital in Caceres province in Spain. Spain on Monday joined other European nations, such as France, Italy and Germany, in suspending the use of the AstraZeneca/Oxford vaccine over fears that it could lead to blood clots. (Photo by Gustavo Valiente/Xinhua)