Fire ant Immunotherapy with inteRvals Extended to 12 weekS: The FIRES study

Area of Science:

• Allergy and Immunology
• Clinical Research
• Toxicology

Background:

• No prior studies evaluated 12-week extended maintenance interval (EMI) immunotherapy (IT) for imported fire ant (IFA) sting anaphylaxis prevention.
• Existing research lacks data on the efficacy of prolonged intervals in IFA IT.

Purpose of the Study:

• To assess the safety and efficacy of 12-week maintenance intervals for patients undergoing IFA IT.
• To determine if extended intervals are a viable option for IFA hypersensitivity management.

Main Methods:

• Adults with IFA hypersensitivity received IT with 6-, 8-, and 12-week maintenance intervals after 3 months of conventional IT.
• Efficacy was evaluated through annual IFA sting challenges.
• Safety was monitored for systemic reactions during extended interval injections and field stings.

Main Results:

• Twenty-five patients initiated EMI; initial reactions ranged from mild to severe.
• No patients experienced systemic reactions to extended interval injections, cluster refills, field stings, or sting challenges.
• Treatment cohort demonstrated safety and efficacy with the 12-week EMI.

Conclusions:

• A 12-week EMI is a safe and effective treatment for adults with IFA hypersensitivity who have had proven efficacy with conventional IT.
• EMI offers benefits including fewer injections, reduced clinic visits, and minimized lapses in treatment.
• This study supports EMI as a practical option for long-term IFA IT management.