Most discussions of SARS-CoV-2 immune escape focus on antibodies. But the virus also encounters a diverse and geographically structured landscape of HLA molecules through which T cells recognise infection. I wrote a short piece on this other immune landscape:
www.pnas.org/doi/10.1073/...
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The other immune landscape of SARS-CoV-2 evolution | PNAS
The other immune landscape of SARS-CoV-2 evolution