When Marnie Monogue developed a tickle in her throat last week, COVID-19 was the last thing on her mind. ”I had been feeling sick and awful all day Saturday,” said Monogue, 24, who lives in Uptown and works in marketing for a nonprofit. “I kept thinking, ‘Oh, it’s just sinus pressure from changes in the weather.’” Monogue took two at-home COVID-19 tests Saturday night. Both were positive. ...