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Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Clin+Transl+Immunology 2022 ; 11 (4): e1387 Nephropedia Template TP
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Off-target effects of bacillus Calmette-Guerin vaccination on immune responses to SARS-CoV-2: implications for protection against severe COVID-19 #MMPMID35573165
Messina NL; Germano S; McElroy R; Rudraraju R; Bonnici R; Pittet LF; Neeland MR; Nicholson S; Subbarao K; Curtis N
Clin Transl Immunology 2022[]; 11 (4): e1387 PMID35573165show ga
BACKGROUND AND OBJECTIVES: Because of its beneficial off-target effects against non-mycobacterial infectious diseases, bacillus Calmette-Guerin (BCG) vaccination might be an accessible early intervention to boost protection against novel pathogens. Multiple epidemiological studies and randomised controlled trials (RCTs) are investigating the protective effect of BCG against coronavirus disease 2019 (COVID-19). Using samples from participants in a placebo-controlled RCT aiming to determine whether BCG vaccination reduces the incidence and severity of COVID-19, we investigated the immunomodulatory effects of BCG on in vitro immune responses to SARS-CoV-2. METHODS: This study used peripheral blood taken from participants in the multicentre RCT and BCG vaccination to reduce the impact of COVID-19 on healthcare workers (BRACE trial). The whole blood taken from BRACE trial participants was stimulated with gamma-irradiated SARS-CoV-2-infected or mock-infected Vero cell supernatant. Cytokine responses were measured by multiplex cytokine analysis, and single-cell immunophenotyping was made by flow cytometry. RESULTS: BCG vaccination, but not placebo vaccination, reduced SARS-CoV-2-induced secretion of cytokines known to be associated with severe COVID-19, including IL-6, TNF-alpha and IL-10. In addition, BCG vaccination promoted an effector memory phenotype in both CD4(+) and CD8(+) T cells, and an activation of eosinophils in response to SARS-CoV-2. CONCLUSIONS: The immunomodulatory signature of BCG's off-target effects on SARS-CoV-2 is consistent with a protective immune response against severe COVID-19.