An 'avirulent' pathogen is a pathogen which is not virulent.
This is similar to 'atypical' which means 'not typical'
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The dimention
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Technically a 'pathogen' IS measels. A pathogen is a fancy name
for Bacteria. And a pathogen is a bacteria that IS a certin
disease. Hencforth, the answer to your question would be measles IS
its own pathogen.