Overview
This lecture demonstrates how easily nasal secretions (like from a cold) can spread via contact in everyday situations, using a simulated experiment with fluorescent dye.
Simulating Nasal Secretion Spread
- A mechanical nasal drip rig dispenses fluorescent fluid to mimic a runny nose.
- The fluorescent dye is non-toxic and glows under blacklight for easy tracking.
- After one hour, the dye spread to everything Adam touched, contaminating his workspace extensively.
Testing Contamination at a Party
- Six guests (three "germaphobes" and three unaware participants) attend a party with Adam using the nasal drip rig.
- Germaphobes are instructed to avoid contact with Adam's secretions; others are unaware of the test.
- Normal party activities are performed (eating, games), with Adam frequently wiping his nose and touching objects.
- At the end, blacklight inspection reveals wide contamination among guests and objects.
Results & Conclusions
- Five out of six guests showed evidence of contamination after 30 minutes.
- Germaphobe Kari successfully avoided contamination through careful hygiene, but others struggled due to social norms.
- The experiment demonstrates how easily cold viruses can be transmitted via indirect contact at social gatherings.
Key Terms & Definitions
- Fluorescent Dye — A substance that glows under UV light, used here to track the spread of nasal secretions.
- Contamination — The presence of unwanted substances, in this case, simulated nasal secretions, on people or objects.
- Germaphobe — A person with an extreme fear of germs, actively avoiding contamination.
Action Items / Next Steps
- Practice good hand hygiene to minimize the spread of germs.
- Be cautious of social contact, especially during cold and flu season.