Infectious materials can include which of the following?

The correct choice is blood or blood products because these materials are associated with a higher risk of transmitting bloodborne pathogens, such as HIV, hepatitis B, and hepatitis C. Blood is considered one of the primary infectious materials that can directly harbor these pathogens, making it a critical factor in infection control and safety regulations.

Other bodily fluids, such as saliva, sweat, or urine, may not typically be classified as infectious materials under standard precautions unless they are visibly contaminated with blood or the individual's infectious status is unknown. Therefore, while other options may have some risk in specific contexts, blood or blood products stand out as the primary concern in preventing the spread of bloodborne infections. It's crucial to focus on the materials that are more likely to be involved in health-related transmissions when discussing infectious materials.