Wheat-germ agglutination of Neisseria gonorrhoeae. A laboratory investigation

Area of Science:

• Microbiology
• Bacteriology
• Clinical Diagnostics

Background:

• Accurate identification of Neisseria species is crucial for clinical and epidemiological purposes.
• Routine laboratory methods for Neisseria identification require validation for reliability.

Purpose of the Study:

• To evaluate the efficacy of wheat germ agglutinin (WGA) lectin assay for identifying Neisseria species in a routine laboratory setting.
• To assess the reliability of WGA for differentiating Neisseria gonorrhoeae from other Neisseria species.

Main Methods:

• Wheat germ agglutination (WGA) was employed to test 168 strains of Neisseria gonorrhoeae and 105 strains of other Neisseria species.
• Reactivity and agglutination titres were recorded for each tested Neisseria strain.

Main Results:

• Approximately one-third of tested meningococci strains exhibited reactivity with WGA.
• Variability in WGA titres was observed upon repeat testing for certain Neisseria organisms.
• The lectin assay demonstrated inconsistent results across different Neisseria species.

Conclusions:

• Wheat germ agglutination (WGA) is considered an unreliable technique for the definitive identification of Neisseria species in routine diagnostic laboratories.
• The observed variability and inconsistent reactivity suggest WGA is not a suitable method for differentiating Neisseria species, including Neisseria gonorrhoeae.