Coxiella burnetii antigens (C. burnetii antigens)

Coxiella burnetii antigens are the molecular components of the obligate intracellular Gram-negative bacterium responsible for Q fever, a zoonotic disease. These antigens primarily include surface-exposed proteins and lipopolysaccharides (LPS) that exhibit significant phase variation; Phase I antigens possess a full-length, smooth LPS that masks surface proteins from the host immune system and is highly infectious, while Phase II antigens have a truncated, rough LPS and are typically less virulent (Source: CDC, NIH). These antigens are critical for the pathogen's ability to invade host macrophages and survive within the harsh, acidic environment of the phagolysosome (Source: PubMed, PMC4481352). In a therapeutic context, these antigens serve as the basis for vaccines, such as the whole-cell Q-Vax, which aim to elicit protective T-cell mediated immunity and antibody production (Source: StatPearls). However, the use of these antigens in vaccines is complicated by the risk of severe inflammatory reactions in individuals with prior exposure to the bacterium, necessitating rigorous pre-screening protocols (Source: Australian Immunisation Handbook).

Other names

Q fever antigensPhase I antigensPhase II antigensCoxiella burnetii surface proteinsCoxiella burnetii lipopolysaccharide

Induction of active immunity through the stimulation of humoral (B-cell) and cellular (T-cell) immune responses against the Coxiella burnetii bacterium.