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The ugly viruses don’t look that different from other viruses, but they are a lot more trouble! Ugly viruses are very contagious - they spread very quickly - and make lots of people seriously ill. Ugly viruses can cause pandemics, which are diseases that spread around the world! Diseases caused by ugly viruses can have really horrible symptoms, which are the aches and pains that people get when they are sick. Each disease has different symptoms - ugly viruses have the worst. Which ugly virus killed millions across the world?
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