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The three most common are the skin, gastrointestinal tract and respiratory tract
Direct contact
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costal location and natural resources.
The circulatory system.
Actually it's too cold for most pathogens to survive down there.
There many common pathogens. They all are disease causing. Path- means disease + -ogen meaning causing. The list is very long but here you will find many http://www.dnafrequencies.com/dp/human.shtml
The most common source of pathogens that cause surgical site infections is the patient.
The most universal biological structure is the cell.
Most commonly, acute bronchitis is caused by viruses. Bacterial causes are numerous, although difficult to prove because many people are colonized with bacterial pathogens in the mouth or oropharynx.The most common suspected bacterial pathogens include Mycoplasma pneumoniae, Chlamydia pneumoniae, Haemophilus influenzae, and Streptococcus pneumonia.
Usually disease can be contracted through air or fluids. Through human to human it is more often airborne than fluid borne.
the skin keeps out most pathogens