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Clinical and Diagnostic Laboratory Immunology, September 1999, p. 675-682, Vol. 6, No. 5
1071-412X/99/$04.00+0
Development of Diagnostic Reagents To Differentiate
between Mycobacterium bovis BCG Vaccination and M. bovis Infection in Cattle
H. M.
Vordermeier,1,*
P. C.
Cockle,1
A.
Whelan,1
S.
Rhodes,1
N.
Palmer,2
D.
Bakker,3 and
R.
G.
Hewinson1
TB Research Group,1
and TB Diagnostic Unit,2 Bacteriology
Department, Veterinary Laboratories Agency
Weybridge, New Haw,
Addlestone, KT15 3NB, United Kingdom, and Department of Small
Ruminants Health, Animal Health Service, Boxtel, The
Netherlands3
Received 13 January 1999/Accepted 20 May 1999
In Great Britain a recent independent scientific review for the
government has concluded that the development of a cattle vaccine
against Mycobacterium bovis holds the best long-term
prospect for tuberculosis control in British herds. A sine qua non for vaccination is the development of a complementary diagnostic test to
differentiate between vaccinated animals and those infected with
M. bovis so that test-and-slaughter-based control
strategies can continue alongside vaccination. In order to assess the
feasibility of developing a differential diagnostic test for a live
vaccine, we chose M. bovis BCG Pasteur as a model system.
Recombinant forms of antigens which are expressed in M. bovis but not, or only at low levels, in BCG Pasteur (ESAT-6,
MPB64, MPB70, and MPB83) were produced. These reagents were tested
either alone or in combination by using peripheral blood mononuclear
cells from M. bovis-infected, BCG-vaccinated, and
Mycobacterium avium-sensitized calves. All four antigens
induced in vitro proliferation and gamma interferon responses only in
M. bovis-infected animals. A cocktail composed of ESAT-6,
MPB64, and MPB83 identified infected animals but not those vaccinated
with BCG. In addition, promiscuous T-cell epitopes of ESAT-6, MPB64,
and MPB83 were formulated into a peptide cocktail. In T-cell assays
with this peptide cocktail, infected animals were identified with
frequencies similar to those obtained in assays with the protein
cocktail, while BCG-vaccinated or M. avium-sensitized animals did not respond. In summary, our results suggest that peptide
and protein cocktails can be designed to discriminate between M. bovis infection and BCG vaccination.
*
Corresponding author. Mailing address: TB Research
Group, Bacteriology Department, Veterinary Laboratories
Agency
Weybridge, New Haw, Addlestone, KT15 3NB, United Kingdom.
Phone: 44 1932 357 884. Fax: 44 1932 357 684. E-mail:
mvordermeier.vla{at}gtnet.gov.uk.
Clinical and Diagnostic Laboratory Immunology, September 1999, p. 675-682, Vol. 6, No. 5
1071-412X/99/$04.00+0
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