Board Thread:General Discussion/@comment-968312-20150209182531

I suppose I was sort of expecting that everyone in the series wouldn't evidently be Type O Negative blood, but yeah - there certainly is a lot of blood transfusions going around in this series and not once do I recall anyone mentioning blood compatibility, which would certainly be a big problem when dealing with smaller populations otherwise.

Yes, I know it's science fiction, but still... ;) 