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Delta, and we're seeing that across the uk. there are reports now, but the majority of infections are omicron, not delta. although we still have significant levels of delta, i have to say. but there is this interesting competition going on at the moment. it is likely that omicron will shortly become the dominant virus. whether that's useful or not, i don't know. with such high levels of infections with all the uncertainty what this means with disease in the elderly and vulnerable, there are so many uncertainties at the moment that i don't think we can be complacent. >> complacency is not somet...

The rapid tests pick up a protein that is manufactured by the virus when it is actively replicating. and that protein is not efaffecd by the mutations that omicron has or the previous variants have. if you think about what is the rationale for picking it up, we don't have a strong rationale. think what we're saying is what we've been saying all along is that the test is different from pcr. yes, it is possible to have virus present that is detectible by pcr. they add a layer of, are you infectious right now? is there virus replicating in your lower passages? we should still be able to pick it u...

To advance its -- this specific variant, that booster candidate that they already have. pfizer says it's also working on a potential solution. what i want to ask you, though, is should this alleviate our fears really, or should we still be concerned about those billions throughout the world that are still unvaccinated, whether they're unwilling or in most cases have not even had access to a single dose of vaccine yet? >> yeah. i'm so glad you asked that. right now there are about 100 million doses of vaccine going unused in wealthy countries that are set to expire next month. so we continue to...

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