Greta Thunberg said she and her father isolated themselves in a borrowed apartment after traveling Central Europe. The teen climate activist said she may have had COVID-19, experiencing some of the symptoms. According to the HuffPost, she reported feeling tired, shivers, a sore throat and a cough. Thunberg said her father felt the same symptoms but more intense and with a fever. After letting people know her experience, she encouraged everyone to follow the advice of experts and stay home.