S. constellatus produces major amounts of lactic acid, fermented glucose, maltose and sucrose, but not lactose and hydrolyzed aesculin.

The typical species is Lancefield Groups A,C, G, and F, with the remaining NG (non-groupable) and haemolysis on blood agar is β-haemolytic and NH (non-haemolytic).

It has also been found to be involved with pulmonary exacerbations in cystic fibrosis patients and can lead to toxic shock and limb amputation.

[1] Normally found in the oral cavities and upper respiratory tracts and isolated from purulent human infections, including appendicitis.

Strains are frequently β-haemolyic and belong to Lancefield Group F or are nonhaemolytic (α and γ) and serologically ungroupable.