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Greetings,Thank you for your question.I am Dr. Su S.I will try my best to help you.
I am sorry for your problem.Your nephew is likely having a viral infection.It is highly contagious.It can spread from person to person quite easily like holding hands, shsring toys, from touching infected surfaces.Yes, you need to be careful.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 her healthy life.Regards.
Usually people are infectious from a few days before the symptoms appear to about 2 weeks after.However, contagiousness is more when there are symptoms.