There are many researches focusing on these vectors and adjuvants, such as heat-labile enterotoxin, choleratoxin, liposome and polyethylenimine.

• 许多学者在不耐热肠毒素、霍乱毒素、脂质体、细菌载体、聚乙烯亚胺等相关载体和佐剂方面做了众多有益的研究。