Polymerase chain reaction, or PCR, was developed to identify a small fragment of a virus and create multiple copies, making detection easier. PCR is the gold standard in testing for COVID-19 and other viral diseases, like Ebola. Learn how this nuclear-derived technique works. Subscribe for more videos: http://goo.gl/VxsqCz Follow IAEA on social media: Facebook - https://www.facebook.com/iaeaorg/ Twitter - https://twitter.com/iaeaorg Instagram - https://www.instagram.com/iaeaorg/ LinkedIn - https://www.linkedin.com/company/iaea © IAEA Office of Public Information and Communication http://iaea.org/