Neonatal calf diarrhea: purification and electron microscopy of a coronavirus-like agent.

Animals Animals, Newborn Cattle Cattle Diseases/etiology,microbiology,pathology Centrifugation, Density Gradient Colostrum Diarrhea/etiology,microbiology,pathology,veterinary Escherichia coli/isolation & purification Feces/microbiology Germ-Free Life Intestines/microbiology Methods Microscopy, Electron RNA Viruses/isolation & purification