The strain (genotype) of TB found in badgers in an area is usually the same as that found in cattle in TB infected herds.
Gan amlaf mae'r straen (genoteip) o TB a ganfyddir mewn moch daear o fewn ardal yn cyfateb i'r straen a ganfyddir mewn gwartheg o fewn buchesi sydd wedi'u heintio â TB.