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Antigenic reactivity of pandemic influenza (H1N1) 2009 viruses from UK (n = 227).

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posted on 24.08.2011, 01:02 by Monica Galiano, Paul-Michael Agapow, Catherine Thompson, Steven Platt, Anthony Underwood, Joanna Ellis, Richard Myers, Jonathan Green, Maria Zambon

Viruses are grouped according with amino acid signature changes described in Figures 2 and 3. Substitutions located within the signal peptide were not considered.


Amino acid changes are described using as reference the sequence of A/California/07/09.


Refers to <4-fold, 4-fold and >4-fold dilutions of antiserum against A/California/07/09. Viruses with >4-fold reduced antigenic reactivity are considered as “low reactors”. Compared with the vaccine strain antiserum, the titres with A/England/195/2009 antiserum were within one-fold of difference in most cases and all the pandemic viruses showed no reactivity against A/Brisbane/59/07 antiserum; therefore these results are not included in the analysis.


Groups where >50% of the viruses shows ≥4-fold reduced reactivity are highlighted in bold letter.


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