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Why antibodies are not the only defence against Omicron
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In the fight against the coronavirus, one key component of the human immune system has been to the fore: antibodies. These Y-shaped proteins have made top news recently, because Covid-19 shots do not produce as many of them that work against the heavily-mutated Omicron variant compared to past strains - at least, not without a booster.
Trained by both vaccines and infection, antibodies grab on to the spike protein that studs the surface of the coronavirus, stopping it from penetrating cells and make the host ill.
But while antibodies are rightly celebrated, they are not the only defence against the virus. In fact, "there's a complex and coordinated response that is really beautiful from an evolutionary standpoint," Harvard immunologist
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