申論題

3. Read the following paragraph and answer the question:

Using transgenic plants as a novel and safe system for vaccine production, which could become an attractive alternative in animal health care. The fact that feeding animals with transgenic plants expressing a recombinant antigen caused a systemic immune response demonstrates the viability of using recombinant plants as both an expression and delivery system for oral vaccines. The establishment of plant-based immunization methods for microbial antigens may be an inexpensive alternative to conventional fermentation systems for vaccine production, as plants can be grown inexpensively in large quantities and provide a practical and feasible delivery system.

Question: Please name   two   advantages of using transgenic plants for vaccine production.