How the pathogen enter in the human body?

Question

How the pathogen enter in the human body?

Answer 1

A pathogen is anything that causes a disease.  Pathogens include:



Bacterium A group of microscopic organisms that are capable of reproducing on their own, causing human disease by direct invasion of body tissues. Bacteria often produce toxins that poison the cells they have invaded. Numerous bacteria also live in harmony with the body and are necessary for human existence, such as bacteria that aid in digestion in the gut. Important bacterial diseases include "strep" tonsillitis, pneumonia, and meningitis. (example: bacterial meningitis or strep throat)

Virus A term for a group of microbes that are incapable of reproducing on their own, and must invade a host cell in order to use its genetic machinery for reproduction. Viruses are smaller than bacteria, and are responsible for the most common human diseases, the common cold and the "flu" (influenza). Viruses are also responsible for more serious diseases such as AIDS, hepatitis B, and hepatitis C. (example: hepatitis A, hepatitis B, and hepatitis C)

Fungus (example: athlete’s foot)





We come in contact with pathogens everyday.  Most of the time our body’s immune system destroys them before they can cause harm.



We are considered exposed when we have been in contact with a pathogen.  

We are considered infected when a pathogen has entered the body and resulted in disease.  





Whether an exposure results in infection depends on three factors:



Dose -  the amount of organisms that enter your body.

Virulence - the strength of the organism.  

Host resistance - the ability of your immune system to fight infection

Answer 2

Many pathogens enter the body through the nose and mouth from environmental and food sources.  They can then infect any point in the gastrointestinal tract and even escape from the GI tract to infect other parts of the body.  Another common port of entry for pathogens to enter is through cuts in the skin.  Through these cuts they can enter the circulatory system and infect any part of the body where they can take up resisdence.  These are the most common but there are other methods of entry know.

Answer 3

mouth, nose, pores, any opening

Answer 4

Any opening in the body.

Artificial or natural.