We correlated the anti-H6 titers with the H6N1 Cal09 NI titers and indeed found a highly significant correlation ( r = 0.726, Fig. 3F ), indicating that anti-stalk/anti-H6 antibodies might contribute to the NI titers, specifically when low levels of NA-specific antibodies are present.
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Analysis of Anti-Influenza Virus Neuraminidase Antibodies in Children, Adults, and the Elderly by ELISA and Enzyme Inhibition: Evidence for Original Antigenic Sin.
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