Alessandra is I’ll with a fever, a cough, and a runny nose.

Alessandra is I’ll with a fever, a cough, and a runny nose. Which precautions should he take to help his family avoid getting sick? Check all that apply.
1. Take vitamins
2. Drink plenty of water
3. Wash his hands frequently
4. Cover his mouth when coughing or sneezing
5. Stay in his room and void commons areas in his house