Pneumococcal polysaccharide disease is caused by a bacteria. It can be deadly but a vaccine was developed to head off the disease before it starts. The vaccine works when a small amount of the bacteria is injected into the patient and his or her immunity works against the disease, causing immunity.

A conjugate Vaccine

typhim is a commercial name of typhoid vaccine Typhim Vi®, Typhoid Vi Polysaccharide Vaccine, produced by Sanofi Pasteur SA, for intramuscular use, is a sterile solution containing the cell surface Vi polysaccharide extracted from Salmonella enterica serovar Typhi, S typhi Ty2 strain.

There are two vaccines for typhoid, Ty21a, which is given orally, and

Vi capsular polysaccharide vaccine, which is an injectable subunit vaccine.

You have two types of vaccines for typhoid fever. One is made from live attenuated bacteria. This vaccine is for oral use. Another vaccine is given by injection route. That is made from capsular polysaccharide of the typhoid bacteria.