# Council Directive of 26 June 1964 on animal health problems affecting intra-Community trade in bovine animals and swine (64/432/EEC), Division 5: A test pattern of seven moisture-free wells shall be cut in the agar to the bottom of the plate; the pattern shall consist of one central well and six wells in a circle around it.

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

Diameter of central well: 4 mm
Diameter of peripheral wells: 6 mm
Distance between central and peripheral wells: 3 mm

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Source: https://www.legislation.gov.uk/eudr/1964/432/annex/D/chapter/II/division/A/division/5 (the official version)
Page: https://openlegislation.uk/eu-directive-1964-432/annex-D/chapter-II/division-A/division-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.