Our expert says:
There are many different viruses that can cause encephalitis and all of them are contagious. Adults, however, do not often get ecephalitis due a better immunity than kids and old people. See http://kidshealth.org/parent/infections/bacterial_viral/encephalitis.html#
If you are not sick you are not a risk to your family. You may have a small risk to get infected, but it may just be with a cold/flu/coldsore, you won't necessarily get encephalitis.
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