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Published on: October 30, 2016
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
Abstract:
Progressive vaccinia (PV) is a rare but potentially lethal complication that develops in smallpox vaccine recipients with severely impaired cellular immunity. We describe a patient with PV who required treatment with vaccinia immune globulin and who received 2 investigational agents, ST-246 and CMX001. We describe the various molecular, pharmacokinetic, and immunologic studies that provided guidance to escalate and then successfully discontinue therapy. Despite development of resistance to ST-246 during treatment, the patient had resolution of PV. This case demonstrates the need for continued development of novel anti-orthopoxvirus pharmaceuticals and the importance of both intensive and timely clinical and laboratory support in management of PV.
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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