Would I be a jerk for calling in sick again today?

I work for a commercial cleaning company and I dont think there is anyone to cover for me yet. I have a sore throat so I called in sick yesterday. My boss aksed if I could work today and I said I should be able to. Well I still have a sore throat. Would I be a jerk if I called in sick again?

Would I be a jerk for calling in sick again today?
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