Slides that are not fixed or stained should be considered infectious.

Slides that are not fixed or stained should indeed be considered infectious due to the potential presence of pathogenic microorganisms. Unfixed and unstained slides may contain live cells, bacteria, viruses, or other contaminants, which can pose a risk of infection if handled improperly.

In laboratory settings, appropriate handling and disposal of such slides is critical, as they can easily transmit infections through contact with mucous membranes or skin, especially if they are broken or if the individual is not using protective equipment. Therefore, it is standard practice to treat these slides as if they are capable of transmitting infection until they have been effectively fixed or stained, which would neutralize the biological hazards they may carry. This precaution is essential for maintaining safety and minimizing risk in laboratory environments.