“COVID-19 can result in prolonged illness even among persons with milder outpatient illness, including young adults,” the report’s authors wrote.

The acknowledgement is welcome news to patients who call themselves “long-haulers” — suffering from debilitating symptoms weeks and even months after their initial infection.

“This report is monumental for all of us who have been struggling with fear of the unknown, lack of recognition and many times, a lack of belief and proper care from medical professionals during our prolonged recovery from COVID-19,” Kate Porter, who is on day 129 of her recovery, wrote in an email to NBC News.