German Chancellor Angela Merkel has received a dose of Moderna as her second shot of Covid-19 vaccine having had Oxford-AstraZeneca as her first. The 66-year-old leader was vaccinated a few days ago after getting a dose of AstraZeneca in April. BBC reported that mixed dosing of Covid-19 vaccines could be a good idea but it is too early to say for sure. In March, Germany, along with other European countries, halted the rollout of the AstraZeneca vaccine after a number of blood clots cases were reported. Germany had previously restricted the use of the jab to over-60s, but is now set to offer it to all adults, German broadcaster Deutsche Welle reports. More than half of the country's population has now received their first dose of a vaccine. One study in the UK found that adults were more likely to report mild and moderate side effects after mixing doses of the AstraZeneca & Pfizer Covid-19 vaccines. Some countries have been looking at mixing vaccines in the face of supply shortages and to improve protection, Reuters news agency reports. Watch the video to know more.