At 74, president's age would be the primary risk factor, says infectious disease expert; Trump's also obese, with a BMI over 30, which lowers immunity to virus

White House doctor says president received experimental antibody treatment, is in good spirits; but grounding of reelection effort comes at worst possible time

Chief of staff 'optimistic' about speedy recovery while Trump considers address to nation; Pence, Pompeo, Kushner, Ivanka test negative; Biden sends well-wishes

US president's positive COVID test shifts election focus to White House's handling of pandemic; quarantine prevents Trump appearing at the large rallies that fuel his campaign

'I hope this serves as a reminder,' Democratic presidential candidate says. 'Wear a mask, keep social distance and wash your hands'

After days of appearing to equivocate on the matter, US leader says 'let me be clear, I condemn the KKK, I condemn white supremacists. I condemn Proud Boys'

US president's coronavirus diagnosis puts him on list with UK's Boris Johnson, Brazil's Bolsonaro and numerous others

'I would like to remind everyone that no one is immune from infection,' Israeli health minister says after US president announces he and the first lady have COVID-19

After debate commission says 'additional structure' needed, US president questions why he would agree to alterations 'when I easily won last time'

'We will get through this TOGETHER!' US president tweets shortly after close aide confirmed to have COVID-19; White House physician says the two 'are both well at this time'