Step 1: Understanding the Concept: Food hazards are substances in food that can cause adverse health effects, categorized into physical, chemical, and biological/microbiological.
Step 2: Detailed Explanation: Rotavirus is a type of virus, which is a microorganism.
Because viruses are microscopic and cannot be seen with the naked eye, they are classified as invisible microbiological hazards.
Physical hazards include visible objects like glass or hair, and chemical hazards involve toxins or pesticides.
Visible biological hazards might include larger pests like insects or visible mold, but a virus is strictly invisible and microbiological.
Step 3: Final Answer: Contamination with Rotavirus results in an invisible microbiological hazard.