Which of the following specimens can be tested in microbiology?

Microbiology is a field that studies microorganisms and their impact on humans, animals, plants, and the environment. In clinical settings, microbiology tests are used to identify and isolate various pathogens from a wide range of specimens to assist in diagnosis and treatment.

The correct answer reflects that microbiological testing can be performed on a variety of specimens, including blood, urine, and tissue. Blood specimens can reveal the presence of bacteria or fungi in cases of systemic infections. Urine specimens are frequently analyzed for urinary tract infections and can help identify pathogens in the urinary system. Tissue specimens may be collected from biopsies to evaluate infectious or inflammatory processes directly in the affected tissues.

Each of these specimen types provides valuable information about different infections or conditions caused by microorganisms. Therefore, stating that all of these can be tested in microbiology signifies the breadth of the laboratory's capabilities to diagnose infections and assess health conditions across multiple systems and types of samples.