Manual for the laboratory identification and antimicrobial susceptibility testing of bacterial pathogens of public health importance in the developing world

Overview

Antimicrobial resistance is an issue of great significance for public health at the global level. However, it is of particular concern in the developing world because fewer affordable and appropriate treatment options are readily available. It has become increasingly important to monitor patterns of resistance as the antimicrobial susceptibility of bacterial pathogens which contribute significantly to the burden of respiratory, febrile, reproductive tract, and diarrheal illness has declined. Because antimicrobial susceptibility testing is resource-intensive, the World Health Organization (WHO) recommends that only one or two reference laboratories in a country perform these tests. Until now, however, there has not been a technically appropriate source of standardized information for laboratory detection of antimicrobial resistance that is practical for use in regions with limited resources.

This laboratory manual focuses on seven bacterial pathogens of public health importance in the developing world: Haemophilus influenzae, Neisseria meningitidis, Streptococcus pneumoniae, Neisseria gonorrhoeae, Salmonella serotype Typhi, Shigella, and Vibrio cholerae. Methods for the isolation and identification of each of these bacterial agents from clinical specimens are presented, and standardized antimicrobial susceptibility testing techniques and criteria for interpretation are described.

To benefit from the information presented in this manual, laboratorians must have received training in proper basic microbiological techniques and be comfortable with such tasks as sterilization of instruments and media preparation. Flow charts of procedures and color figures of bacterial colonies and typical reactions have been provided as supplements to the text for ease of comparative identification. Procedural accuracy and methodological standardization are critical to the performance of antimicrobial susceptibility testing, and adherence to protocols of quality control is also vital to ensure that test results are valid and meaningful.