Because delta is like 10x more contagious and consequently also people are getting hit with higher viral loads. It’s that simple.
And even with Delta, here in BC, where we have over 80% of population vaxxed (including children who just got approved to be vaccinated), deaths are a fraction of what they were pre-vaccination.
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Great news for hospitalization/severe illness/death. Still in the 80-90% effectiveness range after 6 months.