I am a teacher and I am on sick leave because of dengue. My boss texted me asking for a lesson plan for the week, do u think thats proper?

Im asking just to know is it right for my boss to do that knowing that i am very ill. Because im a sensitive person. But im not angry at my boss because i know thats my responsibility. I just feel its a little bit off to ask ur employees to do task knowing they been to emergency a day before.
I am a teacher and I am on sick leave because of dengue. My boss texted me asking for a lesson plan for the week, do u think thats proper?
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