| Spoilage type |
Organisms involved |
Signs of spoilage |
| Souring |
Lactobacillus sp.
Streptoccus sp. |
Sour milk
Curd formation |
| Sweet curding |
Bacillus sp.
Proteus sp. |
Alkaline pH
Curd formation |
| Gas production |
Clastoridium sp. Coliform bacteria |
Explosion of slimy milk |
| Ropiness |
Alcaligenes sp.
Klebsiella sp.
Enterobacter sp. |
Stringy or slimy milk |
| Red rot |
Serratia marcescens |
Red coloration |
| Gray rot |
Clostridium sp. |
Gray colaration |
| Dairy mould |
Penicilium sp.
Geotrichum sp. |
Mouldy appearance |
