<prompt> Not found commonly in a periapical lesionPseudomonasStreptococcusporphyromonasAll of the above  <response>: The microbiota in periapical region is dominated by anaerobes. Streptococcous are thus not common in periradicular lesionscohen 10th ed pg 575. 576.Streptococci are predominant in intraradicular lesions. 