KUALA LUMPUR (Reuters) -Malaysia's jailed former prime minister Najib Razak has been admitted to a hospital after testing positive for COVID-19, his spokesperson said on Thursday. Najib, 70, is in stable condition and is undergoing quarantine and treatment at the hospital, his aide, Muhamad Mukhlis Maghribi, said. Najib was taken to hospital on Tuesday from prison after complaining of fever, he said.