Specific PCR assay for direct detection of intestinal microsporidia Enterocytozoon bieneusi and Encephalitozoon intestinalis in fecal specimens from human immunodeficiency virus-infected patients.
A routine assay based on the PCR was developed for the detection of Enterocytozoon bieneusi and Encephalitozoon intestinalis in fecal samples. Two oligonucleotide primer pairs from a conserved region in the small-subunit rRNA genes of E. bieneusi (primer pair V1 and EB450) and E. intestinalis (primer pair V1 and SI500) were used to amplify microsporidian DNA. We achieved specific amplification of a 382-bp DNA fragment in E. intestinalis and a 353-bp DNA fragment in E. bieneusi. Boiling of the samples appeared to be most effective for DNA extraction. Fecal samples containing fewer than 10 microsporidia gave a positive result in the PCR assay. Fecal specimens from 30 human immunodeficiency virus-infected patients with microsporidiosis and fecal specimens from 42 patients suspected of having microsporidiosis were investigated by the PCR assay. The PCR assay was validated against standard staining methods (the Uvitex 2B and Chromotrope 2R staining methods) and immunofluorescence assay specific for E. intestinalis. This comparative study has shown that PCR improved species determination and can thus be considered a fast and reliable method for the detection and identification of each intestinal species.
Ombrouck
C
C
Centre Hospitalo-Universitaire de la Pitié-Salpêtrière, Unité INSERM 313, Paris, France.
Ciceron
L
L
Biligui
S
S
Brown
S
S
Marechal
P
P
van Gool
T
T
Datry
A
A
Danis
M
M
Desportes-Livage
I
I
D017088:AIDS-Related Opportunistic Infections / Q000175:diagnosis / Q000469:parasitology; D000818:Animals; D001483:Base Sequence; D017931:DNA Primers / Q000235:genetics; D016054:DNA, Protozoan / Q000235:genetics; D016819:Encephalitozoon / Q000235:genetics* / Q000302:isolation & purification*; D016890:Encephalitozoonosis / Q000150:complications / Q000175:diagnosis / Q000469:parasitology; D005069:Evaluation Studies as Topic; D005243:Feces / Q000469:parasitology*; D006801:Humans; D007411:Intestinal Diseases, Parasitic / Q000150:complications / Q000175:diagnosis / Q000469:parasitology; D016816:Microsporida / Q000235:genetics* / Q000302:isolation & purification*; D016881:Microsporidiosis / Q000150:complications / Q000175:diagnosis / Q000469:parasitology; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction / Q000379:methods* / Q000706:statistics & numerical data; D012680:Sensitivity and Specificity; D013045:Species Specificity
D017931:DNA Primers; D016054:DNA, Protozoan