Nuvance Health, which operates hospitals in Danbury, Sharon, New Milford and Norwalk, plans to impose new restrictions on visitations, beginning today. Visitation hours for inpatients will be restricted to a maximum of four hours and limited to one support person per day for patients not suspected or confirmed to have COVID-19. For pediatric and NICU patients, visitors are limited to parents or guardians only. Patients under age 21 may only have the two designated parents or guardians present. Yale New Haven Health announced Wednesday that all visitors planning to see admitted patients will have to show proof they’ve been fully vaccinated or a negative PCR test. The change to the visitation policy, which takes effect on Thursday at 8 a.m., stems from the increased number of COVID-19 cases. Patients will also be allowed only one visitor per day and that visitor must be 18 years or older.