MINNEAPOLIS—Minnesota Gov. Tim Walz has tested positive for COVID-19, along with his wife and teenage son, the governor’s office announced Tuesday. Walz said in a statement that the three of them tested positive on Monday after his son began experiencing mild symptoms over the weekend. The governor and first lady Gwen Walz remain asymptomatic. All three have been vaccinated, including Walz who received the Johnson & Johnson single-dose vaccine in March and the Moderna booster in October. They will quarantine for 10 days, Walz said “My family and I are isolating, and I will continue to work from home until I feel better and test negative for the virus,” Walz said in a statement. “In the meantime, I encourage every Minnesotan to get tested before the holidays, and to roll up their sleeves and get their vaccine and their booster to ensure they, too, have strong protection against COVID-19.” “As a …