Clinical outcomes of radical surgery and antimicrobial agents in vascular pythiosis: A multicenter prospective study

Pattama Torvorapanit, Nipat Chuleerarux, Rongpong Plongla, Navaporn Worasilchai, Kasama Manothummetha, Achitpol Thongkam, Nattapong Langsiri, Jaruwan Diewsurin, Prasopchai Kongsakpaisan, Ratiporn Bansong, Nuttapon Susaengrat, Watchara Wattanasoontornsakul, Ariya Chindamporn, Nitipong Permpalung

Research output: Contribution to journalArticlepeer-review


Vascular pythiosis is a rare, neglected, life-threatening disease with mortality of 100% in patients with incomplete surgical resection or patients with persistently elevated serum β-d-glucan (BDG). The study was conducted to understand the clinical outcomes of new treatment protocols and potential use of erythrocyte sedimentation rate (ESR) and c-reactive protein (CRP) as alternative monitoring tools, given recent favorable minimum inhibitory concentrations (MICs) of antibacterial agents and prohibitive cost of serum BDG in Thailand. A prospective cohort study of patients with vascular pythiosis was conducted between February 2019 and August 2020. After diagnosis, patients were followed at 0.5, 1, 1.5, 3, and 6 months. Descriptive statistics, Spearman’s correlation coefficient, and general linear model for longitudinal data were used. Amongst the cohort of ten vascular pythiosis patients, four had residual disease after surgery. Among four with residual disease, one developed disseminated disease and died, one developed relapse disease requiring surgery, and two were successfully managed with antimicrobial agents. The spearman’s correlation coefficients between BDG and ESR, and between BDG and CRP in patients without relapse or disseminated disease were 0.65 and 0.60, respectively. Tetracyclines and macrolides had most favorable minimum inhibitory concentrations and synergistic effects were observed in combinations of these two antibiotic classes. Adjunctive use of azithromycin and doxycycline preliminarily improved survival in vascular pythiosis patients with residual disease. Further studies are needed to understand the trends of ESR and CRP in this population.

Original languageEnglish (US)
Article number114
Pages (from-to)1-11
Number of pages11
JournalJournal of Fungi
Issue number2
StatePublished - Feb 2021


  • CRP
  • ESR
  • Human pythiosis
  • P. insidiosum
  • Vascular pythiosis
  • β-d-glucan

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science
  • Microbiology (medical)


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