Subdoses of 17DD yellow fever vaccine elicit equivalent virological/immunological kinetics timeline.

Abstract:

BACKGROUND:The live attenuated 17DD Yellow Fever vaccine is one of the most successful prophylactic interventions for controlling disease expansion ever designed and utilized in larger scale. However, increase on worldwide vaccine demands and manufacturing restrictions urge for more detailed dose sparing studies. The establishment of complementary biomarkers in addition to PRNT and Viremia could support a secure decision-making regarding the use of 17DD YF vaccine subdoses. The present work aimed at comparing the serum chemokine and cytokine kinetics triggered by five subdoses of 17DD YF Vaccine. METHODS:Neutralizing antibody titers, viremia, cytokines and chemokines were tested on blood samples obtained from eligible primary vaccinees. RESULTS AND DISCUSSION:The results demonstrated that a fifty-fold lower dose of 17DD-YF vaccine (587 IU) is able to trigger similar immunogenicity, as evidenced by significant titers of anti-YF PRNT. However, only subdoses as low as 3,013 IU elicit viremia kinetics with an early peak at five days after primary vaccination equivalent to the current dose (27,476 IU), while other subdoses show a distinct, lower in magnitude and later peak at day 6 post-vaccination. Although the subdose of 587 IU is able to trigger equivalent kinetics of IL-8/CXCL-8 and MCP-1/CCL-2, only the subdose of 3,013 IU is able to trigger similar kinetics of MIG/CXCL-9, pro-inflammatory (TNF, IFN-γ and IL-2) and modulatory cytokines (IL-5 and IL-10). CONCLUSIONS:The analysis of serum biomarkers IFN-γ and IL-10, in association to PRNT and viremia, support the recommendation of use of a ten-fold lower subdose (3,013 IU) of 17DD-YF vaccine.

journal_name

BMC Infect Dis

journal_title

BMC infectious diseases

authors

Campi-Azevedo AC,de Almeida Estevam P,Coelho-Dos-Reis JG,Peruhype-Magalhães V,Villela-Rezende G,Quaresma PF,Maia Mde L,Farias RH,Camacho LA,Freire Mda S,Galler R,Yamamura AM,Almeida LF,Lima SM,Nogueira RM,Silva Sá GR,Hoka

doi

10.1186/1471-2334-14-391

subject

Has Abstract

pub_date

2014-07-15 00:00:00

pages

391

issn

1471-2334

pii

1471-2334-14-391

journal_volume

14

pub_type

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