scholarly journals Inhibition of Appearance of pH-Dependent Virus-Cell Fusion by Neutralizing Monoclonal Antibodies to Transmissible Gastroenteritis Virus.

1993 ◽  
Vol 55 (4) ◽  
pp. 655-656
Author(s):  
Eiichi HONDA ◽  
Junko OKADA ◽  
Katsunori OKAZAKI ◽  
Yuji KONO
Keyword(s):  
Monoclonal Antibodies ◽  
Cell Fusion ◽  
Transmissible Gastroenteritis Virus ◽  
Gastroenteritis Virus ◽  
Ph Dependent ◽  
Transmissible Gastroenteritis

scholarly journals Partial Passive Protection with Two Monoclonal Antibodies and Frequency of Feeding of Hyperimmune Anti–Transmissible Gastroenteritis Virus (TGEV) Serum for Protection of Three-Day-Old Piglets from a TGEV Challenge Infection

2001 ◽  
Vol 13 (4) ◽  
pp. 290-296 ◽  
Author(s):  
Ronald D. Wesley ◽  
Roger D. Woods
Keyword(s):  
Monoclonal Antibodies ◽  
Challenge Infection ◽  
Transmissible Gastroenteritis Virus ◽  
Passive Protection ◽  
Antigenic Sites ◽  
Gastroenteritis Virus ◽  
Hyperimmune Antiserum ◽  
Virulent Virus ◽  
Transmissible Gastroenteritis ◽  
Piglet Survival

Passive protection experiments were conducted to determine the frequency and amounts of hyperimmune antiserum needed to block a transmissible gastroenteritis virus (TGEV) challenge infection and to identify monoclonal antibodies that are partially protective against TGEV. Hyperimmune antiserum or monoclonal antibodies were added to milk at each feeding or at selected feedings when the amount of antiserum was reduced. Three-day-old piglets were challenged with virulent virus that had been preincubated with antiserum or monoclonal antibodies. The results indicated that supplementing antiserum every other day was not efficacious for protection. Supplementing even small quantities of hyperimmune antiserum (0.5 ml) at least once a day in most cases was sufficient for piglet survival but did not prevent morbidity. Increasing the amount (>2 ml) and providing antiserum 3 times/day completely blocked the TGEV challenge infection. Two monoclonal antibodies were discovered that also provided passive protection for baby pigs. One monoclonal antibody, 5G1, had a high neutralizing titer, and the other, 6C4, was more effective in neutralizing and binding to virulent TGEV than to attenuated TGEVs. Both of these monoclonal antibodies were partially effective as supplements in milk for passive protection. Furthermore, these monoclonal antibodies were useful for boosting the efficacy of TGEV-neutralizing colostrum, which by itself was ineffective. These results show that other antigenic sites, different from the 4-well characterized epitopes on the S glycoprotein of TGEV, also are important for passive protection.

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