Final answer:
Samples such as blood, urine, sputum, feces, and tissue belong to division 2, crucial in diagnosing diseases where white blood cells in urine indicate possible infections.
Step-by-step explanation:
Blood, urine, sputum, feces, or tissue samples belong to division 2. This classification is typically used in medical diagnostics and laboratory contexts, where different types of biological samples are grouped based on potential infectious hazards. For instance, figure 23.1 shows that pathogens causing infections can be detected in urine samples. Additionally, figure 14.15 describes microscopic examination of sputum samples to reveal organisms. Critical thinking question 31 suggests that the presence of white blood cells in the urine may indicate an infection or inflammation within the urinary tract. The CD4 T cell count mentioned for an HIV patient is used to determine the stage of HIV infection, and 700/μL suggests the patient's infection is in stage 1, which indicates that the patient is infected but does not have any apparent illness.