The process of identifying infectious diseases is complex and requires identification of the agent through direct or indirect means. In regards to many microbial diseases, it is often difficult to dia...The process of identifying infectious diseases is complex and requires identification of the agent through direct or indirect means. In regards to many microbial diseases, it is often difficult to diagnose an individual based on clinical presentation. As such, further testing is required. The methods used to diagnose microbial disease include microbial culture, microscopy, biochemical tests, and molecular diagnostics.