<unk>  is a putative virulence factor of the gram-positive bacteria  Streptococcus pneumoniae.
It is a pore-forming toxin of 53 kDa composed of 471 amino acids. It has a range of biological activities including the ability to lyse and interfere with the function of cells and soluble molecules of the immune system.
Released<unk>  will aid the bacteria during colonization, by facilitating adherence to the host, during invasion by damaging host cells, and during infection by interfering with the host immune response.
The presence of<unk>  in sputum, urine, CSF and blood can be indicative of an S. pneumoniae infection.
Pneumolysin
Enterotoxin
Chlorotoxin
Fibrinolysin
Neurotoxin
Beta-lactamase
Ochratoxin A
Heteropodatoxin