# Council Directive of 26 June 1964 on animal health problems affecting intra-Community trade in bovine animals and swine (64/432/EEC), Division 2.3.5: Calculation of results

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

The OIEISS contains 1 000 international CFT units (ICFTU) per ml. If the OIEISS is tested in a given method the result is given as a titre (i.e. highest direct dilution of the OIEISS giving 50 % haemolysis, T OIEISS ). The test result for the test serum given as titre (T TESTSERUM ) must be expressed in ICFTU per ml. In order to convert the expression of a titre into ICFTU, the factor (F) necessary to convert a titre of an unknown test serum (T TESTSERUM ) tested by that method into the ICFTU expression can be found from the formula:
F = 1 000 × 1/T OIEISS
and the content of international CFT units per ml of test serum (ICFTU TESTSERUM ) from the formula:
ICFTU TESTSERUM = F × T TESTSERUM

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Source: https://www.legislation.gov.uk/eudr/1964/432/annex/C/division/2/division/2.3/division/2.3.5 (the official version)
Page: https://openlegislation.uk/eu-directive-1964-432/annex-C/division-2/division-2.3/division-2.3.5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.