Spallanzani to start tests on combining different vaccines

Trial involving 600 volunteers who had 1st dose of AstraZeneca

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Alessio Damato ,Francesco Vaia ,Pfizer ,Lazio Regional Health ,Astrazeneca ,Health Director Francesco Vaia ,Lazio Regional Health Chief Alessiod Amato ,Alessio டமாட்டோ ,ஃபைசர் ,லேஸியோ பிராந்திய ஆரோக்கியம் ,