The antibody responses of mixing are about what you'd expect. Moderna produces the best response, Pfizer the 2nd best, Novavax the 3rd best, and then AZ in a distant 4th. So it's not necessarily mixing that produces any improvement; 2x Moderna would probably be the best of all.
But the cellular responses are interesting. AZ->AZ and Pfizer->Pfizer are about the same against Delta (Pfizer is very slightly better). But AZ->Novavax produces a response nearly 5x higher than AZ->AZ while Pfizer->Novavax produces a terrible response, about 1/2 of what Pfizer->Pfizer is.
Though with the very small sample sizes, it's hard to know if that holds true over a larger population. For instance, the prior Com-Cov study showed Pfizer->Pfizer having nearly 2x the cellular response compared to AZ->AZ, whereas this one shows them being similar.
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