Prime Minister Narendra Modi arrived in the United States to attend the 4th Nuclear Security Summit, in which leaders of more than 50 countries will assess the threats of nuclear terrorism. Smita Sharma spoke to former Pakistan High Commissioner Akbar Ahmad and research fellow at the 华体会 Aparna Pande in the US.
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The P4 laboratory, on the campus of the Wuhan Institute of Virology, in Wuhan, in China's central Hubei province. (Hector Retamal/AFP via Getty Images)