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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.
You are right.
Croup is usually a viral infection.
Sometimes, other causes like an allergy, irritant, reflux can cause it.
I think doctor suspected an associated bacterial infection.
Bacterial infection can set in later.
You can continue it.
Please keep a cool vaporizer on at night.
Keep him well hydrated.
I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish his healthy life.Regards.