RT Journal Article SR Electronic T1 A Consensus Rating Method for Small Virus-Retentive Filters. I. Method Development JF PDA Journal of Pharmaceutical Science and Technology JO PDA J Pharm Sci Technol FD Parenteral Drug Association (PDA) SP 318 OP 333 VO 62 IS 5 A1 Scott Lute A1 William Riordan A1 Leonard F. Pease III A1 De-Hao Tsai A1 Richard Levy A1 Mohammed Haque A1 Jerold Martin A1 Ichiro Moroe A1 Terry Sato A1 Michael Morgan A1 Mani Krishnan A1 Jennifer Campbell A1 Paul Genest A1 Sherri Dolan A1 Klaus Tarrach A1 Anika Meyer A1 The PDA Virus Filter Task Force A1 Michael R. Zachariah A1 Michael J. Tarlov A1 Mark Etzel A1 Kurt Brorson YR 2008 UL http://journal.pda.org/content/62/5/318.abstract AB Virus filters are membrane-based devices that remove large viruses (e.g., retroviruses) and/or small viruses (e.g., parvoviruses) from products by a size exclusion mechanism. In 2002, the Parenteral Drug Association (PDA) organized the PDA Virus Filter Task Force to develop a common nomenclature and a standardized test method for classifying and identifying viral-retentive filters. One goal of the task force was to develop a test method for small virus-retentive filters. Because small virus-retentive filters present unique technical challenges, the test method development process was guided by laboratory studies to determine critical variables such as choice of bacteriophage challenge, choice of model protein, filtration operating parameters, target log10 reduction value, and filtration endpoint definition. Based on filtration, DLS, electrospray differential mobility analysis, and polymerase chain reaction studies, a final rating based on retention of bacteriophage PP7 was chosen by the PDA Virus Filter Task Force. The detailed final consensus filter method was published in the 2008 update of PDA Technical Report 41. Virus Filtration.