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. 2022 Oct 18;3(10):100781.
doi: 10.1016/j.xcrm.2022.100781. Epub 2022 Sep 27.

Functional immune responses against SARS-CoV-2 variants of concern after fourth COVID-19 vaccine dose or infection in patients with blood cancer

Affiliations

Functional immune responses against SARS-CoV-2 variants of concern after fourth COVID-19 vaccine dose or infection in patients with blood cancer

Annika Fendler et al. Cell Rep Med. .

Abstract

Patients with blood cancer continue to have a greater risk of inadequate immune responses following three COVID-19 vaccine doses and risk of severe COVID-19 disease. In the context of the CAPTURE study (NCT03226886), we report immune responses in 80 patients with blood cancer who received a fourth dose of BNT162b2. We measured neutralizing antibody titers (NAbTs) using a live virus microneutralization assay against wild-type (WT), Delta, and Omicron BA.1 and BA.2 and T cell responses against WT and Omicron BA.1 using an activation-induced marker (AIM) assay. The proportion of patients with detectable NAb titers and T cell responses after the fourth vaccine dose increased compared with that after the third vaccine dose. Patients who received B cell-depleting therapies within the 12 months before vaccination have the greatest risk of not having detectable NAbT. In addition, we report immune responses in 57 patients with breakthrough infections after vaccination.

Keywords: COVID-19; SARS-CoV-2; T cells; blood cancer; neutralizing antibodies; variants of concern.

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Conflict of interest statement

Declaration of interests The authors declare no competing interest.

Figures

None
Graphical abstract
Figure 1
Figure 1
NAb and T cell responses after a fourth vaccine dose and breakthrough infections (A) NAbTs against Omicron BA.1, WT, and Delta were measured after the fourth vaccine dose. NAbT below (IC50 titer <40) or above the quantitative range (IC50 titer >2,560) are indicated by horizontal lines. (B) NAbTs against Omicron BA.1, BA.2, WT, or Delta after four vaccine doses. (C and D) Levels of (C) CD4+CD137+OX40+ or (D) CD8+CD137+CD69+ T cells in patients stimulated with WT or Omicron BA.1 full-length spike peptide pools after three or four vaccine doses. (E) NAbTs against Omicron BA.1, BA.2, WT, and Delta before and after breakthrough infection. Infections after two or three vaccine doses are displayed separately. Timing of blood sampling in relation to vaccination and infection is color-coded. The regression line and 95% CI were fitted using LOESS regression. (F and G) Comparison of NAbTs against Omicron BA.1, BA.2, WT, and Delta before infection (but after last vaccine dose) and after infection in patients with breakthrough infection after (F) two and (G) three vaccine doses. Violin plots denote the density of data, point-range denotes the median and the 25th and 75th percentiles. Patients are indicated as individual data points, and samples from individual patients are connected. The proportions of patients with detectable titers are visualized with pie charts (dark blue denotes patients with IC50 titers >40). Biological replicates are patient subjects. There were no technical replicates.

References

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