# Council Directive 2009/156/EC of 30 November 2009 on animal health conditions governing the movement and importation from third countries of equidae (codified version) (Text with EEA relevance), Division 2.2.1: Determine the blocking percentage (BP) of each sample by applying the following formula, where ‘Abs’ stands for antibodies:

Extent: E+W+S+N.I.

BP = Abs control − − Abs sample Abs control − − Abs control + × 100

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Source: https://www.legislation.gov.uk/eudr/2009/156/annex/IV/part/A/division/2/division/2.2/division/2.2.1 (the official version)
Page: https://openlegislation.uk/eu-directive-2009-156/annex-IV/part-A/division-2/division-2.2/division-2.2.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.