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Introduction
Pathogenicity is not the rule . Indeed it occurs so infrequently and involves such a relatively small number of species, considering the huge population of bacteria on Earth, that it has a freakish aspect. Disease usually results from inconclusive negotiations for symbiosis, an overstepping of the line by one side or the other, a biological misinterpretation of borders.
Any organisms or agent that produces such a disease is also known as pathogen, and its ability to cause disease is called pathogenicity. A primary pathogen is any organism that causes disease in a healthy host by direct interaction.

Many steps for infection by pathogenic bacteria usually include the following –
• Maintain the reservoir. A reservoir is a place to live and multiply before and after causing an infection.
• Initial transport to and entry into the host.
• Adhere to colonize and invade host cells or
• Evade host defense mechanism.
• Multiply (grow) or complete its life cycle on or in the host or the host cells.
• Damage the host
Leave the host and return to the reservoir or enter a new host.
Many steps involve for causing infection-
Maintaining a reservoir of bacterial pathogen-
All bacterial pathogens must have at least one reservoir . the most common reservoir for human pathogen are other humans, animals, and the environment . since the source and /or reservoir of the pathogen is part of the infectious disease cycle
Transport of the bacterial pathogen to the host -
An essential feature in the development of an infectious disease is the initial transport of the bacterial pathogen to the host. The most obvious means s direct contact – from host to host . bacteria also are transmitted indirectly in a variety of ways.
Attachment and colonization by the bacterial pathogen –
After being transmitted to an appropriate host cell the bacterial pathogen...