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Andrew Witty
Optum CEO Andrew Witty
Reuters

UnitedHealth has made a fortune from its sprawling network of doctors and clinics. Now it's setting its sights on hospitals.

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johnson & johnson vaccine
A vial of Johnson & Johnson (Janssen's) Covid-19 vaccine.
Eduardo Sanz/Europa Press via Getty Images

Scientists gave J&J vaccine recipients different booster shots in a highly anticipated trial, and found they got a much better immune response with Moderna and Pfizer

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Capsules of molnupiravir, an antiviral drug developed by Merck and Ridgeback Biotherapeutics that could treat COVID-19
Molnupiravir is an experimental oral antiviral developed by Merck and Ridgeback Biotherapeutics that could treat COVID-19
Merck

Merck is set to make billions off a COVID-19 pill that could change the pandemic. Here's why some countries will pay more than others.

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-Leah

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