A corn-based delivery system for animal vaccines: an oral transmissible gastroenteritis virus vaccine boosts lactogenic immunity in swine

• DOI: 10.1016/j.vaccine.2003.11.066
• Publication Date: 2004-04-22T13:16:06Z
• Authors: Barry J. Lamphear; Joseph M. Jilka; Lyle Kesl; Mark Welter; John A. Howard; Stephen J. Streat...
• Keywords: 2. Zero hunger; 0301 basic medicine; Vaccines, Synthetic; Gastroenteritis, Transmissible, of Swine; Swine; Transmissible gastroenteritis virus; Vaccination; Administration, Oral; Viral Vaccines; Zea mays; Article; 3. Good health; 03 medical and health sciences; Drug Delivery Systems; Animals

Recombinant plant expression systems offer a means to produce large quantities of selected antigens for subunit vaccines. Cereals are particularly well-suited expression vehicles since the expressed proteins can be stored at relatively high concentrations for extended periods of time without degradation and dry seed can be formulated into oral vaccines suitable for commercial applications. A subunit vaccine candidate directed against porcine transmissible gastroenteritis virus and expressed in corn seed has been developed for oral delivery to swine. Here, we show that this vaccine, when administered to previously sensitized gilts, can boost neutralizing antibody levels in the animals' serum, colostrum and milk. Thus, this vaccine candidate is effective at boosting lactogenic immunity and is appropriate to pursue through large-scale field trials preceding commercialization.