If the surface of a bacteria cell was not very antigenic then it can enter host cells and eventually cause harm.
What is an antigen?
An antigen is any molecular structure present in a pathogenic organism (e.g., bacteria) that can be detected by the immune system.
Antigens usually bind to antibodies that are able to bind specific antigenic features and thus trigger a concomitant immune response.
In conclusion, if a bacteria cell was not very antigenic then it can cause harm.
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