U.S. Rep. Peter Welch has tested positive for COVID-19, he announced in a social media post on Monday night. Vermont's lone member in the U.S. House said he was experiencing only "mild" symptoms that started earlier in the day. "I am grateful for the protection I have from my vaccine and booster," Welch wrote. "If you're eligible, please get vaccinated and boosted."I will be isolating and working from home this week."With the announcement, Welch has become the highest-ranking public official in Vermont to announce a positive COVID-19 test.