The committee originally chosen to discuss nomenclature was joined by a majority of the participants at this meeting. In addition to the recommendations listed below, it was proposed and adopted by the meeting that comments on nomenclature be included in the proceedings (see Appendix 1). It was further proposed and adopted that these comments be presented to the International Commission on Zoological Nomenclature.
I. The following definitions should be adopted.
A. Isolate. Viable organisms, isolated on a single occasion from a field sample, in experimental hosts or culture systems, or prepared as a stabilate.B. Stock. All the populations of a parasite derived from an isolate without any implication of homogeneity or characterization. Populations comprising a single stock thus include infected cell lines and tick stabilates and subsequent parasite preparations derived from them.
C. Line. A laboratory derivative of a stock maintained under defined physical conditions, for example, maintained as a culture of parasitized bovine lymphoid cells.
D. Parasite clone. Theileria species line derived from a single parasite.
E. Cell clone. Theileria species line derived from a single parasitized cell.
F. Strain. A population of homogeneous organisms possessing a set of defined characters. Unambiguous characterization of a strain can be assured only if the population of organisms was initiated from a parasite clone.
G. Stabilate. A sample of organisms preserved alive (usually in replicate) on a single occasion.
In accordance with these definitions, the term "strain" should be reserved for cloned parasite populations that have been precisely defined; where such definition has not been carried out, the terms "isolate" or "stock" should be used, according to the circumstances. (These definitions are essentially those from Irvin, A.D., Dobbelaere, D.A.E, Mwamachi, D.M., Minami, T., Spooner, P.R. and Ocama, J.G.R. [1983]. Research in Veterinary Science 35:341-346.)
II. Geographical and locational names should not be used for isolates or stocks and a code and numbering system should be adopted identifying:
A. parasite
B. originating laboratory
C. laboratory reference number
III. The confusion in taxonomy must be resolved by consultation with expert opinion and within accepted international rules governing nomenclature.
