Va. Code Ann. § 32.1-43

The State Health Commissioner shall have the authority to require quarantine, isolation, immunization, decontamination, or treatment of any individual or group of individuals when he determines any such measure to be necessary to control the spread of any disease of public health importance and the authority to issue orders of isolation pursuant to Article 3.01 (§ 32.1-48.01 et seq.) of this chapter and orders of quarantine and orders of isolation under exceptional circumstances involving any communicable disease of public health threat pursuant to Article 3.02 (§ 32.1-48.05 et seq.) of this chapter.