Protection conferred by typhoid fever against recurrent typhoid fever in urban Kolkata.

Abstract:

:We evaluated the protection conferred by a first documented visit for clinical care of typhoid fever against recurrent typhoid fever prompting a visit. This study takes advantage of multi-year follow-up of a population with endemic typhoid participating in a cluster-randomized control trial of Vi capsular polysaccharide typhoid vaccine in Kolkata, India. A population of 70,566 individuals, of whom 37,673 were vaccinated with one dose of either Vi vaccine or a control (Hepatitis A) vaccine, were observed for four years. Surveillance detected 315 first typhoid visits, among whom 4 developed subsequent typhoid, 3 due to reinfection, defined using genomic criteria and corresponding to -124% (95% CI: -599, 28) protection by the initial illness. Point estimates of protection conferred by an initial illness were negative or negligible in both vaccinated and non-vaccinated subjects, though confidence intervals around the point estimates were wide. These data provide little support for a protective immunizing effect of clinically treated typhoid illness, though modest levels of protection cannot be excluded.

journal_name

PLoS Negl Trop Dis

authors

Im J,Islam MT,Kim DR,Ahmmed F,Chon Y,Zaman K,Khan AI,Ali M,Sur D,Kanungo S,Dutta S,Bhattacharya SK,Dougan G,Holt KE,Marks F,Kim JH,Qadri F,Clemens JD

doi

10.1371/journal.pntd.0008530

subject

Has Abstract

pub_date

2020-08-17 00:00:00

pages

e0008530

issue

8

eissn

1935-2727

issn

1935-2735

pii

PNTD-D-19-01180

journal_volume

14

pub_type

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