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2015 ; 10
(9
): e0136500
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
The Efficacy of the BCG Vaccine against Newly Emerging Clinical Strains of
Mycobacterium tuberculosis
#MMPMID26368806
Henao-Tamayo M
; Shanley CA
; Verma D
; Zilavy A
; Stapleton MC
; Furney SK
; Podell B
; Orme IM
PLoS One
2015[]; 10
(9
): e0136500
PMID26368806
show ga
To date, most new vaccines against Mycobacterium tuberculosis, including new
recombinant versions of the current BCG vaccine, have usually been screened
against the laboratory strains H37Rv or Erdman. In this study we took advantage
of our recent work in characterizing an increasingly large panel of newly
emerging clinical isolates [from the United States or from the Western Cape
region of South Africa], to determine to what extent vaccines would protect
against these [mostly high virulence] strains. We show here that both BCG Pasteur
and recombinant BCG Aeras-422 [used here as a good example of the new generation
BCG vaccines] protected well in both mouse and guinea pig low dose aerosol
infection models against the majority of clinical isolates tested. However,
Aeras-422 was not effective in a long term survival assay compared to BCG
Pasteur. Protection was very strongly expressed against all of the Western Cape
strains tested, reinforcing our viewpoint that any attempt at boosting BCG would
be very difficult to achieve statistically. This observation is discussed in the
context of the growing argument made by others that the failure of a recent
vaccine trial disqualifies the further use of animal models to predict vaccine
efficacy. This viewpoint is in our opinion completely erroneous, and that it is
the fitness of prevalent strains in the trial site area that is the centrally
important factor, an issue that is not being addressed by the field.