First Necrotizing Fasciitis Caused by Haemophilus influenza Serotype a

Area of Science:

• Infectious Diseases
• Dermatology
• Surgical Pathology

Background:

• Necrotizing fasciitis (NF) is a rapidly progressive soft tissue infection with high morbidity and mortality.
• Prompt medical and surgical management is crucial but does not always prevent severe outcomes.
• Rare bacterial pathogens can cause severe NF, posing diagnostic and therapeutic challenges.

Purpose of the Study:

• To report a unique case of necrotizing fasciitis caused by *Haemophilus influenza* type a.
• To emphasize the aggressive nature of this infection and the challenges in its management.
• To highlight the importance of considering unusual pathogens in severe soft tissue infections.

Main Methods:

• Case report of a 67-year-old male with necrotizing fasciitis of the lower extremity.
• Detailed description of surgical interventions, including debridements and reconstructive techniques.
• Documentation of wound care, including ACell Matrix, split-thickness skin grafting, and negative pressure wound therapy (NPWT).

Main Results:

• The patient presented with extensive necrotizing fasciitis despite initial aggressive treatment.
• Multiple surgical debridements, ACell Matrix, split-thickness grafting, and NPWT were employed.
• Ultimately, a below-knee amputation was necessary due to the infection's progression.
• This is the first documented instance of *Haemophilus influenza* type a causing necrotizing fasciitis.

Conclusions:

• Necrotizing fasciitis, even with optimal care, can lead to devastating outcomes.
• *Haemophilus influenza* type a should be considered as a potential causative agent in severe NF cases.
• Aggressive surgical management and advanced wound care are essential, but may not always obviate the need for amputation in severe NF.