nonhuman 10 priority journal 10 rat 10 Animals 8 Rats 8 Rats, Wistar 8 article 8 cholera toxin 8 peyer patch 8 Cholera Toxin 6 Cholera toxin 6 animal cell 6 cholera 6 controlled study 6 Administration, Oral 4 Antibodies, Bacterial 4 Antitoxins 4 B-Lymphocytes 4 Immunoglobulin A 4 Lymphocyte Count 4 Lymphoid Tissue 4 Peyer patch 4 Peyer's Patches 4 Spleen 4 Vibrio cholerae 4 animal experiment 4 animal model 4 animal tissue 4 antibody production 4 antibody response 4