Figure 4.

In vivo protection of newborn pigs against transmissible gastroenteritis virus (TGEV). The virus titres in the lung and gut were determined after the administration of extracts from infected plants to pigs which had been challenged with TGEV. Positive controls consisted of parental antibody 6A.C3 and ɛSIP expressed in Sp2/0 mammalian cells. The decrease in virus titre was determined as described in ‘Experimental procedures’. Mean values and standard deviations correspond to the decrease in virus titres in three to four piglets tested for each plantibody.