Flagella

Flagella
They are organs of locomotion.
They are made up of a protein flagellin.
Flagellar antigen induces specific antibodies in high titers. These
antibodies are not protective but are useful in serodiagnosis.
Types:
1. Peritrichous
all around cell, e.g. Typhoid bacillus.
2. Polar
at one or both ends:
a. Single
monotrichous, e. g. Cholera
b. Tufts
lophotrichous, e.g. Spirilla
c. Both poles
amphitrichous
Flagella may be seen under dark ground illumination.
They can be visualized by special staining techniques or by electron
microscopy. Their presence can be observed on the semisolid agar
medium by noting spreading type of growth due to motility.