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Delta variant’s higher infectivity helps its quick spread July 25, 2021 KARACHI: Since first appearing in India in late 2020, the Delta variant of SARS-CoV-2 has become the predominant strain in much of the world. Researchers might now know why Delta has been so successful: people infected with it produce far more virus than do those infected with the original version of SARS-CoV-2, making it very easy to spread, mentions Sara Reardon while reporting for Nature magazine published on July 23, 2021. According to current estimates, the Delta variant could be more than twice as transmissible as the original strain of SARS-CoV-2. To find out why, epidemiologist Jing Lu at the Guangdong Provincial Center for Disease Control and Prevention in Guangzhou, China, and his colleagues tracked 62 quarantined people exposed to Covid-19 and who were some of the first people in mainland China to become infected with the new deadly strain. The team tested study participants’ ‘viral load’

Jing luSara reardonEmma hodcroftBenjamin cowlingGuangdong provincial centerUniversity of bernUniversity of hong kongDisease controlஜிங் லுசாரா ரிர்டந்பெஞ்சமின் கோலிங்குவாங்டாங் மாகாண மையம்பல்கலைக்கழகம் ஆஃப் பெர்ன்பல்கலைக்கழகம் ஆஃப் ஹாங் காங்நோய் கட்டுப்பாடு