PuSH - Publikationsserver des Helmholtz Zentrums München: SARS-CoV-2 neutralization capacity in hemodialysis patients with and without a fifth vaccination with the updated comirnaty original/omicron BA.4-5 vaccine.

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Liao, B.H.* ; Platen, L.* ; Grommes, M.* ; Cheng, C.C.* ; Holzmann-Littig, C.* ; Christa, C.* ; Haller, B.* ; Kappler, V.* ; Bester, R.* ; Werz, M.L.* ; Platen, E.* ; Eggerer, P.* ; Tréguer, L.* ; Küchle, C.* ; Schmaderer, C.* ; Heemann, U.* ; Renders, L.* ; Protzer, U. ; Braunisch, M.C.*

SARS-CoV-2 neutralization capacity in hemodialysis patients with and without a fifth vaccination with the updated comirnaty original/omicron BA.4-5 vaccine.

Vaccines 12:308 (2024)

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BACKGROUND: Hemodialysis patients have reduced serologic immunity after SARS-CoV-2 vaccination compared to the general population and an increased risk of morbidity and mortality when exposed to SARS-CoV-2. METHODS: Sixty-six hemodialysis patients immunized four times with the original SARS-CoV-2 vaccines (BNT162b2, mRNA-1273) either received a booster with the adapted Comirnaty Original/Omicron BA.4-5 vaccine 8.3 months after the fourth vaccination and/or experienced a breakthrough infection. Two months before and four weeks after the fifth vaccination, the live-virus neutralization capacities of Omicron variants BA.5, BQ.1.1, and XBB.1.5 were determined, as well as neutralizing and quantitative anti-SARS-CoV-2 spike-specific IgG antibodies. RESULTS: Four weeks after the fifth vaccination with the adapted vaccine, significantly increased neutralizing antibodies and the neutralization of Omicron variants BA.5, BQ.1.1, and XBB.1.5 were observed. The increase was significantly higher than after the fourth vaccination for variants BQ.1.1 and BA.5. Of all analyzed variants, BA.5 was neutralized best after the fifth vaccination. We did not see a difference in humoral immunity between the group with an infection and the group with a vaccination as a fifth spike exposure. Fivefold-vaccinated patients with a breakthrough infection showed a significantly higher neutralization capacity of XBB.1.5. CONCLUSION: A fifth SARS-CoV-2 vaccination with the adapted vaccine improves both wild-type specific antibody titers and the neutralizing capacity of the current Omicron variants BA.5, BQ.1.1, and XBB.1.5 in hemodialysis patients. Additional booster vaccinations with adapted vaccines will likely improve immunity towards current and original SARS-CoV-2 variants and are, therefore, recommended in hemodialysis patients. Further longitudinal studies must show the extent to which this booster vaccination avoids a breakthrough infection.

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