Abstract

The relative potencies of a number of rabies immunoglobulin preparations were estimated in an international collaborative study comprising eight laboratories in five countries. Two assay methods were used: a virus neutralization test in mice (MNT) and a virus neutralization test in cell culture (RFFIT). Differences between the results obtained by the two methods, which have been reported, could not be generally corroborated. The results indicate that in some laboratories the MNT cause difficulties and give results different from those obtained by RFFIT. In other laboratories such difficulties are not encountered. The results seem to indicate that the RFFIT is a more reliable method than the MNT.

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