What is the correct bleach solution ratio for treating a bodily-fluid surface spill?

The recommended bleach solution ratio for treating a bodily-fluid surface spill is 1 part bleach to 9 parts water. This specific dilution is effective for disinfecting surfaces contaminated with bodily fluids, ensuring that pathogens are sufficiently neutralized without causing unnecessary damage to surfaces.

Using this ratio strikes a balance between effectiveness and safety. The bleach solution should be potent enough to kill bacteria and viruses that may be present in bodily fluids, while also being diluted to prevent harm to the surfaces being cleaned. Proper dilution is essential, as using full-strength bleach or inappropriate ratios can lead to skin irritation, respiratory issues, and damage to various materials, which is not ideal in a cleaning scenario.

In contrast, the other ratios presented, such as 1:3, 1:20, and full-strength bleach, may not provide the adequate disinfecting power or safety recommended for dealing with spills involving potentially infectious materials.