Classification of bacteria on the basis of their morphology

Classification of bacteria on the basis of their morphology

Bacteria three types :

1.True bacteria  

2.Spirochetes         

3.Filamentous bacteria

    1.True bacteria for types :

a.Cocci

b.Vibrio

c.Spirilla

d.Bacillus

Cocci two types :

    1.Gram positive                         2.Gram negative

       ·Staphylococci                          * Neisseria

       ·Streptococci.

Bacillus three types:

    1.Gram positive                  2. Acid                  3. Gram negative

·Gram positive two types:

1.Spore forming                      2.Non –spore forming

Gram positive bacteria: 

Bacteria that retain the crystal violet color after decolorizing by alcohol, they stain dark purple.

Examples:

Some gram positive cocci:

-          Staphylococcus aureus

-          Streptococcus progenies

-          Streptococcus pneunomonia

-          Streptococcus bovis

-          Abiotrophia adiacens

Some gram positive bacilli:

-          Corynebacterium diptheriae

-          Clostridium species

-          Bacillus cereus

-          Lactobacillus species

Gram negative bacteria: 

Bacteria that lose the crystal violet colour after decolorizing by alcohol, they stain pink after treatment with safranin.

Examples:

some gram negative cocci:

-          Neisseria gonorrhoeae

-          Neisseria meningitides

-          Moraxella catarrhalis

Some Gram negative bacilli:

-          Salmonella typhi

-          Shigella spp.

-          E,coli.

-          Helicobacter pylori.

-          Morganella morganii

-          Enterobacter cloacae