Updated Tuesday, 20April2021-22: 53

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  • Reactions These are the possible mechanisms that explain the relationship between the AstraZeneca vaccine and clotting problems

  • Combination The Carlos III Institute begins an 'express' study to see the effects of the combination of AstraZeneca and Pfizer vaccines

The Carlos III Health Institute announced this Monday the start of a clinical trial whose objective is to evaluate the

effects of giving a dose of Pfizer's vaccine against Covid-19 to those who have already received a first 'prick' with AstraZeneca.

The research, called


and in which

600 people under 60 years of age

(the age range in which the product has been restricted) will participate, aims to

identify whether "the alternative of combining the two vaccines can be offered",


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