What Causes a ‘Flu Season’ and Why Does It Change Every Year?
The flu is like a party that changes guests each year. Sometimes it brings the loud, energetic kids, other times the quiet, sneaky ones. The reason? The virus likes to switch up its outfit so people can’t always recognize it.
Why It Changes
The flu virus has different costumes (called strains), and sometimes it swaps them out. If you’ve seen one version before, you might not remember the next one, that’s why you get sick again.