[Characterization of Haemophilus influenzae strains using sugar fermentation]

Area of Science:

• Microbiology
• Bacteriology
• Epidemiology

Background:

• Haemophilus influenzae is a significant cause of bacterial infections, including meningitis and respiratory illness.
• Characterization of circulating strains is crucial for understanding disease epidemiology and developing control strategies.
• Carbohydrate fermentation offers a simple method for subtyping bacterial strains.

Purpose of the Study:

• To characterize Haemophilus influenzae strains circulating in Havana City using carbohydrate fermentation.
• To determine the prevalence of different fermentative patterns.
• To correlate strain patterns with patient age and clinical presentation.

Main Methods:

• Carbohydrate fermentation tests were performed on 64 Haemophilus influenzae isolates.
• Strains were further differentiated using serotyping and biotyping.
• Fermentative patterns were analyzed in relation to patient demographics and clinical syndromes.

Main Results:

• Fermentative pattern D was the most frequently identified.
• Patterns D and G accounted for 72% of all strains studied.
• Combining fermentation with serotyping and biotyping yielded 14 distinct strain groups.
• Specific patterns were associated with age groups and clinical conditions like bacterial meningoencephalitis and acute respiratory infections.

Conclusions:

• Carbohydrate fermentation is a valuable and simple method for subtyping Haemophilus influenzae.
• The study provides baseline data on circulating strains in Havana, Cuba.
• The method's ease of use makes it suitable for resource-limited settings.