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© World Health Organization 2011

This document is not a formal publication of the World Health Organization. All rights reserved. This document may, however, be reviewed, abstracted, reproduced and translated, in part or in whole, but not for sale or for use in conjunction with commercial purposes.

The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the World Health Organization concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. Dotted lines on maps represent approximate border lines for which there may not yet be full agreement.

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For microbiology staff in National Reference Laboratories, CDC will provide a free copy of this book upon request. Additional copies can also be obtained from WHO.

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