ce of carbohydrate-binding agents can strongly inhibit coronaviruses, including transmissible gastroenteritis virus, infectious bronchitis virus (IBV), feline coronaviruses serotypes I and II, mouse hepatitis virus (MHV), and PRRSV [21].

2.1  Source and structure of polysaccharides
The main sources of polysaccharides are endogenous glycosaminoglycans (GAGs), Marine polysaccharides a