ルームメイトさんStudy Permitですか?
2019年度のワーホリは保険加入しないと申し込めないと思いますが。
CICからの引用↓
have health insurance for the duration of your stay
You may have to present evidence of this insurance when you enter Canada
病院行きそうになければオーナーに言ったらどうかな?
その家だって風評被害は嫌だろうし、オーナーはStayさせる上でテナントに話はできると思うけど。
It is better if those you live with can stay somewhere else, especially if they have a weak immune system or chronic health conditions. If you need to share a home, stay and sleep in a room with good airflow that is away from others. Use a separate bathroom if you can. Wear a face mask (surgical/procedure mask) if you are in the same room with anyone. Avoid face to face contact; friends or family can drop off food outside your room or home.