Nuvance Health expects to receive its first batch of COVID-19 vaccine this week.  Spokeswoman Amy Forni says they don't have an exact time, but are prepared for their arrival for Danbury, Norwalk, New Milford and Sharon hospitals.  State officials say more than 19-hundred vaccines are expected at Danbury Hospital this week to be distributed across the Nuvance system.  The Pfizer vaccine must be kept in an ultra cold freezer and staff is expected to be vaccinated at least 24 hours after the doses arrive.  The Food and Drug Administration approved the vaccine for emergency use on Friday night.  Moderna must still go through the approval process.