Isolation of Bacillus anthracis from soil in selected high-risk areas of Zimbabwe
Article first published online: 1 OCT 2012
© 2012 The Society for Applied Microbiology
Journal of Applied Microbiology
Volume 113, Issue 6, pages 1389–1395, December 2012
How to Cite
Chikerema, S.M., Pfukenyi, D.M., Hang'ombe, B.M., L'Abee-Lund, T.M. and Matope, G. (2012), Isolation of Bacillus anthracis from soil in selected high-risk areas of Zimbabwe. Journal of Applied Microbiology, 113: 1389–1395. doi: 10.1111/jam.12006
- Issue published online: 16 NOV 2012
- Article first published online: 1 OCT 2012
- Accepted manuscript online: 17 SEP 2012 09:08PM EST
- Manuscript Accepted: 31 AUG 2012
- Manuscript Revised: 27 AUG 2012
- Manuscript Received: 6 JUL 2012
- Bacillus anthracis spores;
To isolate Bacillus anthracis from cattle carcass burial sites from high-risk districts in Zimbabwe.
Methods and Results
Soil samples were collected from carcass burial sites from seven areas, including two national game parks. Samples were collected from top 5–10 cm, and for spore extraction, 25 g of soil was suspended in sterile distilled water overnight. Supernatants were filtered through 0·45-μm pore cellulose nitrate, deposits suspended in 5 ml phosphate-buffered saline, aliquoted and heated at temperature regimen of 65, 70, 75 and 80°C for 15 min. Samples were plated onto PLET agar. B. anthracis isolates were identified using growth morphology and PCR detecting pXO1 and pXO2 virulence plasmids. From samples heated at 75°C for 15 min, B. anthracis were isolated from 9 of 81 (11·1%) soil samples representing five of the seven sampled areas.
We isolated B. anthracis from soil collected from carcass burial sites. PCR targeting virulence plasmids provided a rapid confirmation of B. anthracis.
Significance and Impact of the study
The positive isolation indicated that some carcass burial sites may retain viable spores for at least 12 months after the previous outbreak, which suggests that they may be important sources of B. anthracis and new disease outbreaks.