[ad_1] <br><img src="https://cdn.cnn.com/cnnnext/dam/assets/200903183155-corey-coopersmith-split-hp-video.jpg" /><br>Redefining Covid-19: Months after infection, patients report breathing difficulty, excessive fatigue <br>[ad_2] <br><a href="https://www.cnn.com/collections/coronavirus-intl-0913/">CNN </a>