Can you solve this riddle?

Very few friends I have, renowned am not,
Concealed and shielded behind much, difficult to spot.
I am like bug and sickness;
I am contagious not always wanted,
Though I am small, they fear me greatly,
for I might leave them haunted.
At times I am tough to keep,
my master forced to let me free,
Then I rupture and soar around and they converse regarding me.
I may be friend or foe, servant or teacher,
I am like a bird; I want to be free creature.

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