- Genes specifying receptors for F18 fimbriated Escherichia coli, causing oedema disease and postweaning diarrhoea in pigs, map to chromosome 6. Vögeli, P., Bertschinger, H.U., Stamm, M., Stricker, C., Hagger, C., Fries, R., Rapacz, J., Stranzinger, G. Anim. Genet. (1996)