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How contagious is measles?

Measles is one of the most infectious diseases known, with each infected person typically spreading it to 12-18 others in an unvaccinated population. For comparison, Covid-19's original strain spread to 2-3 people. This high contagiousness means even small drops in vaccination rates, like Bangladesh's 6% fall, can quickly lead to widespread outbreaks and deaths.

Stories that explain this

Measles has killed 1,147 people in Bangladesh, mostly children under five

Related explainers

Is measles a UK problem? How effective is the vaccine? Are other countries struggling? What is measles? Why are measles cases rising? What is a measles outbreak? What are measles symptoms?

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