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Open AccessJournal ArticleDOI

Lymphocyte subset analyses in healthy adults vaccinated with yellow fever 17DD virus.

TLDR
The levels of neutralizing antibodies of first-time vaccinees were similar to those presented by re-vaccinees at day 30 after vaccination, indicating the success of primary vaccination.
Abstract
In this study the kinetics of humoral and cellular immune responses in first-time vaccinees and re-vaccinees with the yellow fever 17DD vaccine virus was analyzed. Flow cytometric analyses were used to determine percentual values of T and B cells in parallel to the yellow fever neutralizing antibody production. All lymphocyte subsets analyzed were augmented around the 30th post vaccination day, both for first-time vaccinees and re-vaccinees. CD3+ T cells increased from 30.8% (SE +/- 4%) to 61.15% (SE +/- 4.2%), CD4+ T cells from 22.4% (SE +/- 3.6%) to 39.17% (SE +/- 2%) with 43% of these cells corresponding to CD4+CD45RO+ T cells, CD8+ T cells from 15.2% (SE +/- 2.9%) to 27% (SE +/- 3%) with 70% corresponding to CD8+CD45RO+ T cells in first-time vaccinees. In re-vaccinees, the CD3+ T cells increased from 50.7% (SE +/- 3%) to 80% (SE +/- 2.3%), CD4+ T cells from 24.9% (SE +/- 1.4%) to 40% (SE +/- 3%) presenting a percentage of 95% CD4+CD45RO+ T cells, CD8+ T cells from 19.7% (SE +/- 1.8%) to 25% (SE +/- 2%). Among CD8+CD38+ T cells there could be observed an increase from 15 to 41.6% in first-time vaccinees and 20.7 to 62.6% in re-vaccinees. Regarding neutralizing antibodies, the re-vaccinees presented high titers even before re-vaccination. The levels of neutralizing antibodies of first-time vaccinees were similar to those presented by re-vaccinees at day 30 after vaccination, indicating the success of primary vaccination. Our data provide a basis for further studies on immunological behavior of the YF 17DD vaccine.

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Yellow fever vaccine

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References
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M-1/M-2 macrophages and the Th1/Th2 paradigm.

TL;DR: The results indicate that M-1- or M-2-dominant macrophage responses can influence whether Th1/Th2 or other types of inflammatory responses occur.
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Immunopathogenesis of dengue virus infection

TL;DR: Dengue-virus-induced vasculopathy and coagulopathy must be involved in the pathogenesis of hemorrhage, and the unbalance between coagulation and fibrinolysis activation increases the likelihood of severe hemorrhage in DHF/DSS.
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Fever and multisystem organ failure associated with 17D-204 yellow fever vaccination: a report of four cases.

TL;DR: The clinical features, their temporal association with vaccination, recovery of vaccine-related virus, antibody responses, and immunohistochemical assay collectively suggest a possible causal relation between the illnesses and yellow fever vaccination.
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Antivirally protective cytotoxic T cell memory to lymphocytic choriomeningitis virus is governed by persisting antigen.

TL;DR: Adoptive transfer experiments of immune spleen cells into syngeneic recipients without addition of antigen demonstrated that maintenance of the antiviral protective capacity of the transferred cells depended on the presence of viral antigen.
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When do antibodies develop after first dose of Covid vaccine?

The levels of neutralizing antibodies of first-time vaccinees were similar to those presented by re-vaccinees at day 30 after vaccination, indicating the success of primary vaccination.