How without delay do swine flu symptoms start to appear after you hold caught the virus?

My boyfriend's friends Mum has it and he went round today as he didn't know. Now his Mum won't let him out this weekend incase he have it. When will we know?
Answers:    this virus presents symtoms 48 to 72 hours after being infected. Source(s): RN
1-5 days


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