COVID-19 vaccines based on messenger RNA (mRNA) technology, such as Moderna and the Pfizer-BioNTech vaccines.Asked whether health authorities should avoid giving the Astrazeneca vaccine to people aged over 60, Cavaleri said: "Yes, and many countries, such as France and Germany, are considering it in the light of greater availability of mRNA vaccines."The Italian government said on Friday it would restrict the use of the AstraZeneca vaccine to people aged over 60, after a teenager who had received the shot died from a rare form of blood clotting.Like many European countries, Italy briefly halted AstraZeneca inoculations in March over concerns about the rare blood clotting problems.It resumed them the following month with the recommendation.