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Hepatitis A virus and blood products: virus validation studies
1University of North Carolina at Chapel Hill, USA.
Summary
Hepatitis A virus (HAV) safety in factor VIII (FVIII) products was studied. Current production steps may not sufficiently reduce HAV infectivity, suggesting additional viral clearance methods are needed.
Area of Science:
- Virology
- Biotechnology
- Blood Product Safety
Background:
- Reports indicate Hepatitis A virus (HAV) transmission via blood products.
- Factor VIII (FVIII) products are crucial for treating hemophilia.
Purpose of the Study:
- To evaluate HAV clearance during the manufacturing of solvent/detergent (S/D) inactivated FVIII products.
- To determine if existing production steps provide adequate viral safety against HAV.
Main Methods:
- Virus validation studies were conducted on four key manufacturing steps: cryoprecipitation, S/D inactivation, DEAE chromatography, and lyophilization.
- Infectivity reduction was quantified across these steps.
Main Results:
- The combined reduction in HAV infectivity across the four steps ranged from 8.6 to 9.3 log10.
- This reduction may be insufficient to guarantee a significant safety margin against HAV.
Conclusions:
- Current manufacturing processes for S/D inactivated FVIII may not adequately ensure HAV safety.
- Additional methods to reduce HAV infectivity are recommended for FVIII production, especially in regions with high HAV prevalence.
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