THE European Union's drug regulator said on Tuesday there had been more than 300 cases worldwide of rare blood clotting incidents combined with low platelet counts after use of COVID-19 vaccines. There were 287 occurrences with the AstraZeneca vaccine, eight with Johnson & Johnson's shot, 25 for Pfizer and five for Moderna, said Peter Arlett, Head of Data Analytics at the European Medicines Agency (EMA).