Vaccines are biological preparations that provide active acquired immunity against infectious diseases. Immunotherapies are treatments that use the immune system to prevent or treat disease.
Bacteria are single-celled microorganisms that lack a nucleus. They have a cell wall that provides structural support and maintains their shape. The bacterial cell wall is composed of peptidoglycan, a polysaccharide molecule that provides rigidity to the cell wall. medical microbiology and immunology lange pdf
Bacteria have a single circular chromosome that contains their genetic material. They can also have plasmids, which are small, extrachromosomal DNA molecules that carry additional genes. Bacterial genetics is the study of how bacteria inherit and express their genetic traits. which are small
