Which specific nursing interventions are implemented in the care of a child with leukemia who is at risk for infection? Select all that apply.

1. Maintain the child in a semiprivate room.
2. Reduce exposure to environmental organisms.
3. Use strict aseptic technique for all procedures.
4. Ensure that anyone entering the child's room wears a mask.
5. Apply firm pressure to a needle stick area for at least 10 minutes