Biological Indicator

Biological Indicator

Biological indicator generally are highly resistant bacterial spores present in greater number then the normal contamination of the product and with equal or greater resistance than normal microbial flora in the products being sterilized. Biological indicators are standardized preparation of resistant organisms, usually in sporulating form, of one species used for the validation of sterilization, while Bacillus stearothermophilus is preferred for steam sterilization. Biological indicator are those organisms used to indicate a particular condition. The term most commonly applied for coliform bacteria e.g. Ecoli or streptocoecus facealis indicat the degree of water pollution due to faecal contamination. Biological indicators should be considered only as an additional method for monitoring the sterilization. If they are us used, strict precautions should be taken avoid transferring microbial contamination from them.