Why doesn’t an injection of streptokinase cause a streptococcal infection?

The bacterial enzyme streptokinase is used to digest fibrin (blood clots) in patients with athersclerosis. Why doesn’t injection of streptokinase cause a streptococcal infection? How do we know the streptokinase will digest fibrin only and not good tissue?

I’m pretty sure those are two different bacteria. A streptococcal infection is caused by streptococcus.

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