An elderly patient lives alone in the community and is concerned about recent exposure to the flu. ...

An elderly patient lives alone in the community and is concerned about recent exposure to the flu. The patient requests an influenza vaccination. Which information should be given?
 
  1. Because exposure has already occurred, the injection will not reduce the risk of developing flu this season.
  2. Protection against the flu should begin in about 1 to 2 weeks after injection.
  3. Elderly persons should not receive the vaccine unless they live in a confined space.
  4. The vaccine is given only if the exposures have been verified as type A influenza.