What are the main differences between the Pfizer coronavirus vaccine and Moderna coronavirus vaccine that are being reported? Any similarities?

Both are American companies but Pfizer is developing its vaccine in partnership with German biotech company. Pfizer, claims its vaccine is 90% effective, though, as Grindrod cautions it is far too early to say if that fiver percent difference is a true difference. One significant difference between the two is that Modera vaccine remains stable at normal vaccine storage temperatures, while the Pfizer vaccine requires ultra-low temperatures of around -70C. This requirement could present Pfizer’s vaccine with storage and transportation challenges, as the company admitted when it announced the vaccine.