What is the difference between H and O antigen?

What is the difference between H and O antigen?

The key difference between O and H antigen is that O antigen is the outermost portion of the bacteria’s surface covering while H antigen is the slender threadlike structure that is part of the flagella.

Which antigen is Salmonella flagella antigen?

Serotypes in subspecies I are also given names (e.g., Salmonella enterica serotype Typhimurium). The H antigens of Salmonella have been well described and are primarily encoded by one of two genes, fliC and fljB, which express the phase 1 H antigen and the phase 2 H antigen, respectively (11, 14, 15, 20, 22, 35, 37).

What is flagellar antigen?

The O antigen, also called somatic antigen, is the polysaccharide portion of the outer membrane liposaccharide and the H antigen, also called flagellar antigen, is the protein flagellin that makes the filaments of the bacterial flagellum.

Where is H antigen found?

RBCs
The Hh blood group contains one antigen, the H antigen, which is found on virtually all RBCs and is the building block for the production of the antigens within the ABO blood group.

How is H antigen formed?

The H antigen is produced by a specific fucosyltransferase. Depending upon a person’s ABO blood type, the H antigen is converted into either the A antigen, B antigen, or both. If a person has blood group O, the H antigen remains unmodified.

What is Salmonella typhi O and H?

S typhi O positive means active infection of typhoid fever. Active infection indicates the patient has an infection of Salmonella enterica serovar typhi. S typhi H positive means there is a past infection or it shows the result of the immunized person’s serum test report.

What is the flagellar structure in bacteria?

The bacterial flagellum is a motile organelle composed of thousands of protein subunits. The filamentous part that extends from the cell membrane is called the axial structure and consists of three major parts, the filament, hook, and rod, and other minor components.

What is the structure of flagella?

Bacterial flagella are a coiled, thread-like structure, sharp bent, consisting of a rotary motor at its base and are composed of the protein flagellin. A shaft exists between a hook and a basal body passing through the protein rings in the cell membrane.

What is the structure of flagellum?

What is H antigen composed of?

The resulting antigens are oligosaccharide chains, which are attached to lipids and proteins that are anchored in the RBC membrane. The H antigen is produced by a specific fucosyltransferase. Depending upon a person’s ABO blood type, the H antigen is converted into either the A antigen, B antigen, or both.

What is AH and BH in Widal test?

TH – Flagellar (H) antigen of Salmonella typhi. AH – Flagellar (H) antigen of Salmonella Paratyphi A. BH – Flagellar (H) antigen of Salmonella Paratyphi B The antibodies against O antigen of only Salmonella typhi are measured, since all Salmonella have similar O antigens.

What is the flagella structure and function?

A flagellum is a whip-like structure that allows a cell to move. They are found in all three domains of the living world: bacteria, archaea, and eukaryota, also known as protists, plants, animals, and fungi. While all three types of flagella are used for locomotion, they are structurally very different.

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