system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Not found commonly in a periapical lesion
assistant
The correct answer is  The microbiota in periapical region is dominated by anaerobes. Streptococcous are thus not common in periradicular lesions
cohen 10th ed pg 575. 576.
Streptococci are predominant in intraradicular lesions.