Term: serotype (required for a seropositive sample)

Serological variety of a species characterised by its antigenic properties. For Influenza, HA subtype should be the letter H followed by a number between 1-16 unless novel subtype is identified and the NA subtype should be the letter N followed by a number between 1-9 unless novel subtype is identified. If only one of the subtypes have been tested then use the format H5Nx or HxN1. Example: H1N1

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