Value of an ELISA for mycobacterial antigen detection as a routine diagnostic test of pulmonary tuberculosis.
Asian Pac J Allergy Immunol
;
1990 Jun; 8(1): 5-11
Article
Dans Anglais
| IMSEAR
| ID: sea-36968
ABSTRACT
A double antibody sandwich ELISA was carried out with commercially available anti-BCG and peroxidase labeled anti-BCG, for the detection of mycobacterial antigens. By using purified protein derivative of tuberculin (PPD) as the antigen, the lowest detection limit of the assay was found to be 0.05 microgram/ml. At the cut off level of absorbance index (Al) greater than or equal to 5. positive results of ELISA were obtained from 24/25 sputum specimens which were positive for staining of acid fast bacilli (AFB), 5/16 specimens positive for culture of Mycobacterium tuberculosis and 67/69 specimens positive for both tests. The assay was positive in only 11/164 specimens negative for both staining of AFB and culture of M. tuberculosis. 4 of which were known to have tuberculosis. Thus, with sputum specimens, the sensitivity, specificity, efficiency, positive predictive value and negative predictive value of the ELISA were 87.27, 93.29, 90.88, 89.72 and 91.62 percent respectively. Positive results were also obtained in 2/111 sputum specimens which were positive for other bacteria but the presence of AFB in these specimens could not be ruled out. With pleural fluid specimens, positive ELISA with Al greater than 1 was found in 3/26 specimens of patients with tuberculous pleurisy and 0/11 of those with malignancy. Twenty-six sera and urine specimens of tuberculous patients and also all control specimens (138 sera and 86 urine specimens) assayed, gave negative ELISA results (Al less than 1).
Texte intégral:
Disponible
Indice:
IMSEAR (Asie du Sud-Est)
Sujet Principal:
Tuberculose pulmonaire
/
Humains
/
Test ELISA
/
Valeur prédictive des tests
/
Reproductibilité des résultats
/
Mycobacterium tuberculosis
/
Antigènes bactériens
Type d'étude:
Etude diagnostique
/
Étude pronostique
langue:
Anglais
Texte intégral:
Asian Pac J Allergy Immunol
Année:
1990
Type:
Article
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