Most abundant facultative anaerobe in colon and feces
Lactose fermenter (This property distinguishes it from Salmonella and Shigella-two most common intestinal pathogen)
Antigenic properties: There are more than 1000 antigenic types of Escherichia coli.
a. O-Cell wall antigens (>150 types)
b. H- Flagellar antigen (>50 types)
c. K- capsular antigen (>90 types)
Features of E.coli which helps for Laboratory diagnosis
E.coli, ferments lactose and produces pink colonies in MacConkey Agar. (E.coli O157:H7) does not ferment sorbitol, which serves as an important criterion that distinguishes it from other strains of E.coli
On EMB agar, E coli produces characteristics green sheen
Microorganisms in Milk
Microorganisms in Milk
Milk is sterile at
secretion in the udder but is contaminated by bacteria even before it leaves
the udder. Except in the case of mastitis, the bacteria at this point are
harmless and few in number. F…Read More
Spoilage Microorganisms in Milk
Spoilage Microorganisms
in Milk
The microbial quality of raw milk is
crucial for the production of quality dairy foods. Spoilage is a term used to
describe the deterioration of a foods' texture, colour, odour or flavour to…Read More
Pathogenic Microorganisms
in Milk
Hygienic milk production practices,
proper handling and storage of milk, and mandatory pasteurization has decreased
the threat of milkborne diseases such as tuberculosis, brucellosis, an…Read More
Some Common Bacteria
1. Bacillus subtilis:
Characters:
1. It is rod shaped bacterium commonly known as hay bacillus.
2. Endospore formation is very common.
3. It is commonly found in decomposing organic matters.
4. It produces an antibioti…Read More
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