Four reasons why the US has seen a surge in Covid-19 cases

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Early lockdown easing, media reporting, Covid-19 parties and breakdowns in federal leadership have all been cited as possible reasons behind the increase in cases of infection. Dr Aileen Marty, an infectious disease specialist at the Herbert Wertheim College of Medicine in Miami, Florida and Josh Sharfstein, Vice Dean for Public Health Practice and Community Engagement for the Johns Hopkins Bloomberg School of Public Health explain. Photo: Rally at Pennsylvania State Capitol to ease lockdown order Credit: Getty Images