The common cold is the world's most widespread infectious disease.

To elaborate:
- It's caused by viruses, most commonly rhinoviruses.
- On average, adults get 2 to 3 colds per year, while children may get even more.
- Symptoms include sneezing, runny nose, nasal congestion, sore throat, and cough.
- It's highly contagious and spreads easily through tiny droplets in the air when an infected person coughs or sneezes.
- There's no cure, but symptoms can be managed with rest, fluids, and over-the-counter medications.
- Despite being a minor illness for most people, it causes significant economic impact due to missed work and school days.

Its ubiquity across all global regions makes it the most common infectious disease experienced by humans worldwide.