Passing bacteria, viruses or AIDS indirectly from one patient to another through the use of improper sterilization procedures, unclean instruments, or "recycling" of orthodontic products.

A transfer of bacteria from one product to another by either direct or indirect contact.

The process by which microbes are unintentionally transferred from one substance or object to another, with harmful effect.

 – A condition when two or more powders are mixed by accident, usually resulting in a reduction in quality.

Transfer of harmful substances or disease-causing microorganisms to food by hands, food-contact surfaces, sponges, cloth towels and utensils that touch raw food that are not cleaned, and then touch ready-to-eat foods. Cross contamination can also occur when raw food touches or drips onto cooked or ready-to-eat foods.

The tainting that can occur when raw product comes into contact with cooked product, allowing bacteria to pass from one to the other; or, the tainting may result from contact between different types of raw product, such as fish and meat. Cross-contamination can also occur when surfaces are not cleaned between uses for different products.

The movement of underground contaminants from one level or area to another due to invasive subsurface activities.

The movement of underground contaminants from one level or area to another due to invasive subsurface activities.

The unintentional transfer of bacteria or other micro-organisms through hands, clothes or kitchen tools from a food or non-food source with harmful human effect.

Cross Contamination: The transfer of harmful bacteria from one food to another.

The process by which microbes are unintentionally transferred from one substance or object to another, with harmful effect.

When germs from one food item are passed to another food item, usually raw food to ready-to-eat food. Double Handwash

When germs from one food item are passed to another food item, usually raw food to ready-to-eat food. Double Handwash

When germs from one food item are passed to another food item, usually raw food to ready-to-eat food. Double Handwash

When germs from one food item are passed to another food item, usually raw food to ready-to-eat food. Double Handwash

When germs from one food item are passed to another food item, usually raw food to ready-to-eat food. Double Handwash

When germs from one food item are passed to another food item, usually raw food to ready-to-eat food. Double Handwash

When germs from one food item are passed to another food item, usually raw food to ready-to-eat food. Double Handwash

The transfer of bacteria from contaminated food (usually raw) to ready to eat food by direct contact, drip contact or indirect contact for example by a person or a cloth

The passing of bacteria, microorganisms, or other harmful substances indirectly from one person to another through improper or non-sterile equipment, procedures, or products.

Cross contamination (direct or indirect) is the transmission of pathogenic microorganisms to non-contaminated substances.

The spread of contaminants from an affected area or person to an unaffected area or person.