החיסון לקורונה של חברת פייזר

?Are there any potential problems There are still many unanswered questions as this is only interim data. We do not know if the vaccine stops you spreading the virus or just from developing symptoms. Or if it works equally well in high-risk elderly people. The biggest question - how long does immunity last - will take months or potentially years to answer. There are also massive manufacturing and logistical challenges in immunising huge numbers of people, as the vaccine has to be kept in ultra-cold storage at below minus 80C. The vaccine appears safe from the large trials so far but nothing, including paracetamol, is 100% safe.