Maximus Peto’s Commentary
I found this report interesting because the authors report that CMV seropositivity was associated with a “lower recall response to the [influenza vaccine in older people]”, suggesting that CMV may impair vaccine (and other antigen) responses in older people.
Impact of ageing and a synbiotic on the immune response to seasonal influenza vaccination; a randomised controlled trial.
Clin Nutr. 2018 Apr;37(2):443-451.
Enani S, Przemska-Kosicka A, Childs CE, Maidens C, Dong H, Conterno L, Tuohy K, Todd S, Gosney M, Yaqoob P
PubMed publication date (edat): 2/22/2017
BACKGROUND & AIMS:
Ageing increases risk of respiratory infections and impairs the response to influenza vaccination. Pre- and pro-biotics offer an opportunity to modulate anti-viral defenses and the response to vaccination via alteration of the gut microbiota. This study investigated the effect of a novel probiotic, Bifidobacterium longum bv. infantis CCUG 52486, combined with a prebiotic, gluco-oligosaccharide, on the B and T cell response to seasonal influenza vaccination in young and older subjects .
In a double-blind, randomized controlled trial, 58 young (18-35 y) and 54 older (60-85 y) subjects were supplemented with the synbiotic for 8 weeks. At 4 weeks they were administered with a seasonal influenza vaccine. B and T cell phenotype and responsiveness to in vitro re-stimulation with the vaccine were assessed at baseline, 4, 6 and 8 weeks.
B and T cell profiles differed markedly between young and older subjects. Vaccination increased numbers of memory, IgA+ memory, IgG+ memory and total IgG+ B cells in young subjects, but failed to do so in older subjects and did not significantly alter T cell subsets. Seroconversion to the H1N1 subunit in the older subjects was associated with higher post-vaccination numbers of plasma B cells, but seroconversion was less consistently associated with T cell phenotype. B and T cell subsets from both young and older subjects demonstrated a strong antigen-specific recall challenge, and although not influenced by age, responsiveness to the recall challenge was associated with seroconversion. In older subjects, CMV seropositivity was associated with a significantly lower recall response to the vaccine, but the synbiotic did not affect the responsiveness of B or T cells to re-stimulation with influenza vaccine.
Antigen-specific B and T cell activation following an in vitro recall challenge with the influenza vaccine was influenced by CMV seropositivity, but not by a synbiotic. Registered under ClinicalTrials.gov Identifier no. NCT01066377.
Free Full-Text: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5851674/