More than 90% of all clinical Brevibacterium are B. casei.

Taxonomy
Family: Brevibacteriaceae

Natural habitats
They are inhabitants of the human skin and can be found in dairy products, fresh and salt water, soil, sewage, fruits, vegetables and rice paddies.

Clinical significance
Rarely causes infection and then only in immunocompromised patients such as, osteomyelitis, peritonitis, bacteremia and malodorous feet

Malodorous feet
Sweat and bacteria is the cause of foot odor.
The most common bacteria Brevibacterium causes smelly feet.
Food odor usually appears to smell cheesy, similar to the smell of ammonia.

They are active on the soles of feet and between the toes.
The bacteria convert methionine to methanethiol, which smells like sulphur, that gives out the foul smell.