(Portland, OR) -- The Oregon Health Authority is reminding people at risk of getting mpox that a two-shot vaccination is 86-percent effective. Mpox is making a resurgence in some U.S. cities, including Chicago, and internationally in France and South Korea. Mpox is spread primarily through close, skin-to-skin contact. The vaccine is free and available to anyone who wants it. More than 13-thousand people in Oregon have received the first shot and over 77-hundred people have received both shots.