Live virus neutralization testing in convalescent patients and subjects vaccinated against 19A, 20B, 20I/501Y.V1 and 20H/501Y.V2 isolates of SARS-CoV-2.

Interestingly, the difference in median NAb titres was highly significant between the two variants ( p < 0.001) for vaccinated subjects (group 1) whereas it was not significant for the two other groups corresponding to naturally infected patients ( Figure 1 (C)).

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