Cyanobacteria: an unrecognized ubiquitous sensitizing allergen?

Area of Science:

• Immunology
• Allergology
• Environmental Health

Background:

• Chronic rhinitis affects a significant portion of the population.
• Cyanobacteria are increasingly recognized as environmental factors impacting respiratory health.
• Previous research has not fully elucidated the role of cyanobacteria in skin sensitization.

Purpose of the Study:

• To investigate the prevalence of skin sensitization to detoxified cyanobacteria in individuals with chronic rhinitis.
• To explore the association between cyanobacteria sensitization and allergic rhinitis severity.
• To identify specific cyanobacteria species responsible for allergic reactions.

Main Methods:

• Skin-prick testing (SPT) was performed on 259 patients aged 7-78 with chronic rhinitis using detoxified cyanobacterial reagents.
• Patients with known allergies to common aeroallergens were included.
• Control subjects were tested to establish irritant threshold responses.

Main Results:

• 28.6% of the study population (74 out of 259 patients) exhibited positive SPTs to at least one cyanobacteria species.
• Microcystis aeruginosa (86%) and Aphanizomenon flos aquae (12%) were the primary sensitizing species.
• A strong association was observed between the severity of atopy, allergic rhinitis, and cyanobacteria sensitization (p < 0.001).

Conclusions:

• Cyanobacteria possess allergenic components independent of their toxins.
• Sensitization to cyanobacteria is prevalent in patients with chronic rhinitis and is associated with atopy.
• This study identifies cyanobacteria as a significant, previously unrecognized allergen group in allergic rhinitis.