If it is a true/false question. Answer would be true. Some people never show symptoms, others show them within 7 days and for others it shows in about 30 days.
You can easily get kidnapped when going up to peoples doors or another can run up and take you. think about it, millions of people you can see in the dark running around and your alone! :) hope this helped
The answer to your question is,
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-Mabel <3