I have performed the antibacterial tests under the presence of E.Coli and S.aurus bacteria. I did not observed any zone of inhibition.

I gone through various literature some literature discussed the following statement

"As material did not show antibacterial activity. Therefore this material is not toxic for useful bacteria and can be used for implant application.

However, other literature reveals

Zone of inhibition can be seen, which concludes the antibacterial activity of the material and material can be used for implant applications.

both statements are contradicting each other.

So i want to know that which statement is true?

Is implant material (Tibial component of Knee) really need to perform antibacterial activity?

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