Clinical Phenotype and Contagiousness of Early Breakthrough SARS-CoV-2 Infections after BNT162b2 COVID-19 mRNA Vaccine: A Parallel Cohort Study in Healthcare Workers.

We observed a significant trend in increasing median Ct values at diagnosis: from the lowest of the whole unvaccinated controls sample (22.5 (19.5–30.5)) to the highest of THCWs (35.0 (31.3–35.9), p = 0.003; all the median Ct values per group are reported in Table 1 and Supplementary Table S2 ).

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