Progressive vaccinia: case description and laboratory-guided therapy with vaccinia immune globulin, ST-246, and

Edith R Lederman1, Whitni Davidson, Harold L Groff

  • 1National Center for Zoonotic Vector Borne and Enteric Disease, Centers for Disease Control and Prevention, Atlanta, GA, USA. erlederman@yahoo.com

Insights

Progressive vaccinia (PV), a severe smallpox vaccine complication, was treated with novel antivirals. Despite drug resistance, the patient recovered, highlighting the need for new anti-orthopoxvirus drugs and robust clinical support.

Area of Science:

  • Immunology
  • Virology
  • Pharmacology

Background:

  • Progressive vaccinia (PV) is a rare, life-threatening condition in individuals with compromised cellular immunity post-smallpox vaccination.
  • Management of PV is challenging, often requiring extensive clinical and laboratory support.

Purpose of the Study:

  • To detail the management of a patient with progressive vaccinia.
  • To illustrate the use of investigational antiviral agents (ST-246 and CMX001) and vaccinia immune globulin in treating PV.
  • To highlight the role of molecular, pharmacokinetic, and immunologic studies in guiding therapy.

Main Methods:

  • Case report of a patient with progressive vaccinia.
  • Treatment involved vaccinia immune globulin, ST-246, and CMX001.
  • Therapeutic adjustments were guided by molecular, pharmacokinetic, and immunologic monitoring.

Main Results:

  • The patient experienced resolution of progressive vaccinia despite developing resistance to ST-246.
  • Intensive clinical and laboratory support was crucial for successful management.
  • The case underscores the utility of investigational antivirals in severe orthopoxvirus infections.

Conclusions:

  • Novel anti-orthopoxvirus pharmaceuticals are essential for managing severe vaccinia infections.
  • Timely and intensive clinical and laboratory support is critical for effective PV treatment.
  • This case demonstrates successful PV management with investigational agents, even with emergent drug resistance.

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