Why are victims of Covid19 being wrapped in plastic?
The WHO guidelines for VHF victims (Ebola etc.) do say that they should be buried in body bags, and if those are not available, in plastic sheeting.


  If body bags are not available, wrap the body in two
  thickness of cotton cloth and soak with 1:10 bleach
  solution. Then wrap the body in plastic sheeting. Seal the
  wrapping with plastic tape. Spray the body bag as in
  Step 3. Place the body in a coffin if one is available.


Obviously some are treating covid-19 victims with the same amount of caution. I can't tell you at the moment if this is justified or not.