Sounds like you were all cuddling up to keep warm in the one bivvi bag on some sheep farm and gave each other a dose! ;-)
Just beware, the viral bit may leave you after 3-4 days but the chest infection may linger and develop into bronchitis or pneumonia. I JEST, NOT!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I have colleagues at work 'off' sick with both after not taking enough time off with the original ailment. I hope you all recover swiftly, just keep taking the 40oz in toddy form!
Regards, Bill