Adjunctive antibacterial agents as a salvage therapy in relapsed vascular pythiosis patients

Area of Science:

• Vascular mycology
• Infectious diseases
• Surgical oncology

Background:

• Human vascular pythiosis is a rare, life-threatening infection caused by the oomycete Pythium insidiosum.
• Intra-abdominal arterial involvement presents a particularly grave prognosis, with historical non-survival rates for unresectable cases.
• Current treatments, including antifungals and immunotherapy, have limited efficacy in advanced vascular pythiosis.

Observation:

• Two patients presented with unresectable intra-abdominal pythiosis involving major arteries.
• Surgical resection was not feasible for either patient due to disease extent.
• Both patients received standard care supplemented with adjunctive antibacterial agents.

Findings:

• Both cases of severe intra-abdominal pythiosis achieved successful clinical and radiological resolution.
• The addition of antibacterial agents to conventional therapy was associated with positive outcomes.
• This suggests a potential synergistic effect or a previously unrecognized role for bacterial co-infection or susceptibility.

Implications:

• Adjunctive antibacterial therapy may offer a new treatment avenue for unresectable vascular pythiosis.
• Further research is warranted to elucidate the mechanisms and optimize this therapeutic approach.
• This finding could improve survival rates for patients with this devastating infection.