No, because you never know their intentions and they could come to where you live and potentially kidnap or harm you.
No sally cannot because the information is not related to holly. the information has to do john. If sally tells holly when the paperwork is ready to be picked up holly could possibly not give the papers to john.
An infection is a disease caught by a person or people that could make someone or something sick. It can be cured or repelled with a special medication.