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* NEWS EXPLAINER * 23 March 2020 _Nature_ examines how viral diagnostic tests work, why testing has varied around the world and the CRISPR-based tests under development to fight COVID-19.
* NEWS EXPLAINER * 23 March 2020 _Nature_ examines how viral diagnostic tests work, why testing has varied around the world and the CRISPR-based tests under development to fight COVID-19.