Coronaviruses are enveloped spherical viruses of the size of 120-160 nm. Their genetic material is encoded within a single strand of RNA of positive sense (+RNA). Club- or petal-shaped spikes covering coronaviruses are the inherent features of theirs, giving them the resemblance to the solar corona in the microscopic imaging - hence the "corona-" prefix. Given both the genome size and the level of their genetic complexity, coronaviruses are the largest viruses with an RNA strand identified to date.
Chitosan is a non-toxic biopolymer that usually takes on the form of white powder. It is a linear polysaccharide composed of randomly distributed acetylated and deacetylated units of D-glucosamine. It is obtained by the deacetylation of chitin of natural origin which, in turn, becomes obtained from exoskeletons of marine organisms, such as crabs or shrimps, as well as from the cell walls of certain fungi. Due to its natural origin, great availability and the properties similar to those of cellulose, chitosan constitutes a valuable polymer that suits the applications in such fields as biomaterials, pharmaceuticals, cosmetics, chemical synthesis, agriculture or food processing.
Porcine Epidemic Diarrhoea
Porcine Epidemic Diarrhoea (PED) is a viral disease of pigs caused by coronaviruses, characterised by watery diarrhoea and weight loss. It affects animals at any age, while the most severe course of the disease is observed among neonatal piglets. Both the morbidity and mortality may reach 100% within the age group mentioned...