I was told by one of my doctors that if you bought a BBQ chicken you can only eat it hot, not to reheat it and not to eat it cold. I was told it's OK to eat cold chicken only if you cooked it yourself, refrigerated it accordingly and then used it within 24 hours.

As for eggs they need to be cooked hard.

Not all that many cases of listeria happen each year in Australia but they do happen. I read recently that 20 odd cases has happened in NSW up til mid may and 4 of those were fatal (2 babies), so although you've probably not contracted it, it's best to be careful just in case.