B. vesicularis and B. diminuta, formely classified as members of group IV of the genus Pseudomonas, are the most frequently isolated Brevundimonas species in human infections

Taxonomy
Family: Caulobacteriaceae

B. vesicularis and B. diminuta are the only human pathogens.
Not pathogenic: B. aurantiaca, B. intermedia, B. nasdae, B. subvibrioides

Natural habitat
They are ubiquitous in the environment.
Because they survive in a moist environment, they can cause problems in a hospital.

Clinical significance
They are rarely isolated from clinical samples.

Very few cases of bacteremia have been reported, with pneumonia, infective endocarditis and spontaneous bacteria peritonitis being the most common foci of infection.

Both B. vesicularis and B. diminuta have been described as opportunistic pathogens in immunocompromised hosts