Sphingomonas ginsenosidimutans and Bacillus cereus: New agents associated with hypersensitivity pneumonitis

Hypersensitivity pneumonitis (HP) is a complex pulmonary syndrome mediated by the immune system and caused by inhalation of a wide variety of aerosolized antigens.1 HP is often unrecognized and frequently misdiagnosed as a respiratory infection because of its relatively low incidence in the general population.2