It might start with just one person. One becomes two, two becomes four, and under the right circumstances a single infection can become an epidemic.
But why do some diseases spread so much faster than others, and is there a limit to how contagious a disease can become?
David Boldeman is joined by science journalist Ellen Phiddian to explore patient zero, why measles is the most contagious disease, and how measles can have a big affect on your immune system.
Read more: https://connectsci.au/news/news-parent/5031/Explainer-how-contagious-can-a-disease-get
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