Imagine viruses are like little party guests. Some know everyone and invite all their friends, making the party huge. Others don’t know anyone and just sit quietly in a corner. The more they spread to others, the contagious they become. If they only show up once in a while, they’re rare.
Examples
- A sneeze from a sick person spreads the flu to many people.
- The common cold is contagious because it spreads through coughs and handshakes.
- A rare virus might only infect one person in a whole town.
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See also
- What Makes a Virus Spread Like Wildfire?
- What Causes a ‘Pandemic’ to Spread So Quickly?
- How Does a Virus Know When to Spread?
- How Does a Virus Spread So Quickly?
- What Causes the ‘Flu’ and How Is It Different From a Common Cold?
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