There have been sporadic anecdotal reports of microchips that could not be read correctly or that have caused problems. Traditionally, these "adverse reactions" have been reported to the companies concerned. However, the BSAVA feels that this information should be coordinated by an independent body, rather as the Veterinary Medicines Directorate does with pharmaceuticals. In August 1997, the BSAVA therefore launched a Microchip Adverse Reaction Reporting Scheme, with an article in JSAP (vol 38, p 369) and distribution of the reporting form to all its members. The purpose of this scheme is to record independently all adverse reactions associated with microchips including migration and loss from the animal. In addition, the form lays out the protocol that should he followed if a problem is encountered. We hope all veterinary surgeons will make use of this scheme so that the results can be collated by one central authority and published on a regular basis. Copies can be obtained from the Cheltenham office.
The problems reported could include:

• Local reactions at the site of implantation. These should be treated as appropriate
• Migration of the chip from the site of implantation. The most common sites are the shoulders and elbow
• Loss of the microchip from the body
• Failure of the microchip to be read (electrical failure)
• Breakage of the microchip within the body (mechanical failure)

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