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Indian Journal of Medical Microbiology, Vol. 23, No. 4, October-December, 2005, pp. 272-273 Correspondence Evaluation of paraffin baiting technique for rapid isolation of atypical mycobacteria *Kaur H, Oberoi A *Corresponding author (email: Code Number: mb05083 Dear Editor, Atypical mycobacteria (AM) are widely distributed in nature and can cause pulmonary disease simulating tuberculosis. Paraffin baiting was developed for isolating organisms like Nocardia and mycobacteria from soil,[1] because of their ability to utilize paraffin wax as the sole source of carbon. The baiting was accomplished by growing the organisms in a medium lacking any carbon source into which were dipped glass rods coated with paraffin wax. Paraffin baiting technique by using paraffin coated glass slide instead of glass rod was evaluated, by using stock cultures of 42 isolates positive for acid fast bacilli by automated Bactec system, one Mtb H37RV strain (negative control) and one Nocardia asteroides (positive control). The stock cultures were grown in 5mL each of 7H9 medium with oleic acid, albumin, dextrose, catalase and incubated at 37°C for 7 days or till the turbidity matched that of McFarland′s no.1 standard. Then 0.5mL of the growth was inoculated into 4.5mL of sterile Czapek broth into which were dipped sterile paraffin coated slides, incubated at 37oC and checked daily for growth. The growth observed on the slide, either in the form of discrete colonies or confluent growth, was subjected to Ziehl Neelsen′s staining technique. Results of paraffin baiting technique in different clinical specimens are shown in the table. Paraffin baiting technique has been used for isolation and drug susceptibility testing of M.avium intracellulare from blood culture by modified broth dilutions assay[2],[3] and growth on slides can even be used for DNA extraction for molecular studies.[2] Therefore, it can be concluded from the study that paraffin baiting technique provides an inexpensive, rapid and simple alternative for isolation, cultivation, speciation, drug susceptibility testing of atypical mycobacteria with lesser risk of contamination with other human pathogens and can be used for isolating atypical mycobacteria from specimens that may contain variety of other organisms . [ Table 1] References
Copyright 2005 - Indian Journal of Medical Microbiology The following images related to this document are available:Photo images[mb05083t1.jpg] |
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