Previous Article | Next Article ![]()
Clinical and Diagnostic Laboratory Immunology, January 2000, p. 86-90, Vol. 7, No. 1
Institute of Microbiology, Federal Armed
Forces Medical Academy, 80937 Munich, Germany1;
Porton Down, Salisbury, United Kingdom2;
Naval Medical Research Institute, Bethesda,
Maryland3; and Federal Institute for
Control of Infectious Diseases of Animals, 2340 Mödling,
Austria4
Received 30 March 1999/Returned for modification 19 August
1999/Accepted 20 October 1999
The early detection of Francisella tularensis, the
causative agent of tularemia, is important for adequate treatment by
antibiotics and the outcome of the disease. Here we describe a new
capture enzyme-linked immunosorbent assay (cELISA) based on monoclonal antibodies specific for lipopolysaccharide (LPS) of Francisella tularensis subsp. holarctica and Francisella
tularensis subsp. tularensis. No cross-reactivity
with Francisella tularensis subsp. novicida,
Francisella philomiragia, and a panel of other possibly related bacteria, including Brucella spp.,
Yersinia spp., Escherichia coli, and
Burkholderia spp., was observed. The detection limit of the
assay was 103 to 104 bacteria/ml. This
sensitivity was achieved by solubilization of the LPS prior to the
cELISA. In addition, a novel immunochromatographic membrane-based
handheld assay (HHA) and a PCR, targeting sequences of the 17-kDa
protein (TUL4) gene of F. tularensis, were used in this
study. Compared to the cELISA, the sensitivity of the HHA was about 100 times lower and that of the PCR was about 10 times higher. All three
techniques were successfully applied to detect F. tularensis in tissue samples of European brown hares (Lepus
europaeus). Whereas all infected samples were recognized by the
cELISA, those with relatively low bacterial load were partially or not
detected by PCR and HHA, probably due to inhibitors or lack of
sensitivity. In conclusion, the HHA can be used as a very fast and
simple approach to perform field diagnosis to obtain a first hint of an
infection with F. tularensis, especially in emergent
situations. In any suspect case, the diagnosis should be confirmed by
more sensitive techniques, such as the cELISA and PCR.
1071-412X/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Detection of Francisella tularensis in
Biological Specimens Using a Capture Enzyme-Linked Immunosorbent
Assay, an Immunochromatographic Handheld Assay, and a PCR
*
Corresponding author. Mailing address: Institute of
Microbiology, Federal Armed Forces Medical Academy, Neuherbergstr. 11, D-80937 Munich, Germany. Phone: 41-89-3168 3277. Fax: 49-89-3168 3292. E-mail: tbl01cn{at}mail.lrz-muenchen.de.
This article has been cited by other articles:
Copyright © 2010 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»