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. 2009 Aug;15(8):1250–1259. doi: 10.3201/eid1508.081754

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Range of hemagglutination-inhibition (HI) and neutralization titers to clade 2.2 and 2.3 heterologous NIBRG-23 and IBCDC-RG5 viruses in postvaccination serum sample F: the number of laboratories reporting specific titer dilution of absolute titers and titers relative to 07/150. A) Absolute horse HI titers, B) absolute neutralization titers, C) titers relative to 07/150 horse HI titers, D) titers relative to 07/150 neutralization titers.