A nutritious broth medium formulated by Todd and Hewitt for the production of antigenic streptococcal haemolysin. The broth is also used to cultivate streptococci prior to serological grouping. Normally the use of fermentable sugars in the broth would inactivate the haemolysin due to acid production. This is prevented by the use of buffers to maintain the pH in this broth.
BM1950 – Todd-Hewitt Broth
|Shelf Life (days)|
|Storage Temp (°C)|
|Steptococcus pneumoniae||NCTC 12977||Growth|
|Streptococcus pyogenes||NCTC 12696||Growth|