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Why patents on Covid-19 vaccines are so contentious

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Biden administration's call to lift patent protections on Covid-19 vaccines to help poor parts of the world get more doses has drawn praise from some countries and health advocates.But it has run into resistance from the pharmaceutical industry and others, who say it won't help curb the outbreak any time soon and will hurt innovation.Here's a look at what patents do and why they matter:HOW DO DRUG PATENTS WORK?Patents reward innovation by preventing competitors from simply copying a company's discovery and launching a rival product.

In the US, patents on medicines typically last 20 years from when they are filed, which is usually done as soon as a drugmaker thinks it has an important or lucrative drug.Because it often takes a decade to get.

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