Viruses are the most powerful pathogens...
Bacteria
arthritis
yes
The common cold is a viral upper respiratory tract infection which mainly affects the nose. The most common pathogen are rhinoviruses.
The term pathogen most commonly is used to refer to infectious organisms. The inactive form of a virus is called a provirus. -ChaCha Answers
You'd most likely want to expose yourself to a "dead" version of that pathogen via vaccination.
Ebola virus is a pathogen that causes diseases of the circulatory system. This can cause failure of most organs and serious bleeding or hemorrhaging.
Proteus
Universal precautions is the best and most effective strategy for reducing occupational bloodborne pathogen infections.
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An 'avirulent' pathogen is a pathogen which is not virulent.This is similar to 'atypical' which means 'not typical'
powerful - more powerful - most powerful