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These are active against a selected group of bacterial types. Narrow spectrum antibiotics are used for the specific infection when the causative organism is known and will not kill as many of the normal microorganisms in the body as the broad spectrum antibiotics. So, It has less ability to cause superinfection. These cause less resistance of the bacteria as it will deal with only specific bacteria. examples include Azithromycin (a azalide, a subclass of macrolide antibiotic), Clarithromycin etc.