Efficacy of purified Vi polysaccharide typhoid vaccine.
This experiment was conducted to assess the efficacy of typhoid vaccine newly produced by purifying Vi antigen of Salmonella typhi. With Karber method, LD50 of challenging organism (S. typhi ty2) was determined as 6.31 CFU/mouse, and then the organism was used for the study. With Probits method, ED50 of the vaccine was determined as 0.016 microg / 0.5 ml / mouse. The ELISA titer (0.5097+/-0.0606) was 4 times in the group treated with high dose (0.25 microg/0.5ml) as in control (0.1113+/-0.0110). Six major protein bands of 66, 55, 35, 33, 18, and 9 kd were detected in Western blot analysis with serum of a vaccine treated mouse, whereas only one weak band of about 35 kd was detected with serum of a control mouse. We concluded that typhoid vaccine produced by purifying Vi antigen of S. typhi very effectively prevent S. typhi infection in mice.
Park
Jong-Hwan
JH
Department of Laboratory Animal Medicine, College of Veterinary Medicine, Seoul National University, Suwon 441-744, Korea.
Hong
Jung-Joo
JJ
Choi
Eun-Sil
ES
Lee
Jin-Won
JW
Park
Jae-Hak
JH
D000818:Animals; D000907:Antibodies, Bacterial / Q000276:immunology; D000942:Antigens, Bacterial / Q000276:immunology* / Q000302:isolation & purification*; D015153:Blotting, Western; D004797:Enzyme-Linked Immunosorbent Assay; D007928:Lethal Dose 50; D016015:Logistic Models; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D011135:Polysaccharides, Bacterial / Q000276:immunology* / Q000302:isolation & purification*; D012485:Salmonella typhi / Q000737:chemistry / Q000276:immunology*; D014435:Typhoid Fever / Q000276:immunology / Q000517:prevention & control; D014436:Typhoid-Paratyphoid Vaccines / Q000008:administration & dosage / Q000276:immunology* / Q000302:isolation & purification*
D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D011135:Polysaccharides, Bacterial; D014436:Typhoid-Paratyphoid Vaccines