# Defining a Pathogen How do we differentiate between good and bad bacteria? It is not that simple. Many bad or pathogenic bacteria are common in most people without causing any harm. Often, only when a host’s immune system is compromised does the pathogenic bacteria reach a harmful state. Later, we will explore this topic and try to answer this question which keeps clinicians awake at night. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://kb.ezbiocloud.net/home/science-blogs/detect/defining-a-pathogen.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.