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Mixing different types of Covid vaccines can boost immune response, study finds Some European countries have started offering alternatives to AstraZeneca as a second shot after the vaccine was linked to rare blood clots. NBC News

A mixed schedule of vaccines where a shot of Pfizer's Covid-19 vaccine is given four weeks after an AstraZeneca shot will produce better immune responses than giving another dose of AstraZeneca, an Oxford study said on Monday.

Former British PM Brown and New Zealand PM Clark say rich nations should send more caccines to the poorer countries. Brown said recent pledges were a  "moral Failure." 

Former Prime Minister Helen Clark says the Covid-19 pandemic will continue to wreak havoc globally unless rich nations "share the burden" and help vaccinate poorer countries.

"If we're to end this pandemic, we need 70 per cent of the global population (according to the head of the World Health Organisation) vaccinated by the time the G7 meets in June next year. On the level of [vaccine] pledge we're seeing, and we're not going to meet that," she said in a webinar last night hosted by the Helen Clark Foundation.

"That means this disease is going to carry on in pandemic phase - which is ghastly. We need to see it coming off the accelerating pandemic, down to the point where it becomes somewhat endemic, and ideally, if more countries follow the approach of New Zealand and Australia - squashing it, eliminating it where it appears - we might even see an end to it one day.

"But the redistribution of existing vaccine orders from the high-income countries like ours is clearly important."  ...