Can a person (in poorer countries) get this first and then Moderna /Pfizer a year or so later? Will the second vaccine cause problems?
Even 60% is better than nothing. Add the percentage that already passed the virus and you get a decent % that no longer get sick or transmit. Not a bad thing, for now.
Giving people multiple vaccines using different vectors is common and tend to help in reaching immunity. Tests are currently under way for dual inoculation of the Oxford and Russian vaccines.
A multi-vaccines protocol is unlikely to include any of the RNA based one however. They are just too expensive and too difficult to store. But a combination of the more traditional is likely.
Even 60% is better than nothing. Add the percentage that already passed the virus and you get a decent % that no longer get sick or transmit. Not a bad thing, for now.