Influence of neutralization assays on plasma neutralization profile of the three patients from whom the new antibodies were isolated In order to illustrate the influence of different assays on the neutralization spectra of these selected plasma, we compared results from all the assays shown in table 1 (except for the HOS-PV assay). The virus panel used in this comparison consisted of nine strains from our primary selection panel from which PV were also available. Three strains from the standardized ''NeutNet'' panel were added: A (92RW009, tier 2), B (SF162, tier 1A) and C (92Br025, tier 2) [15] and personal communication). Results are shown in Table 5 .