# Different body fluids with different blood types?

**URL:** <https://boards.straightdope.com/t/different-body-fluids-with-different-blood-types/744159>\
**Category:** In My Humble Opinion\
**Created:** [January 25, 2016, 7:09am UTC](https://boards.straightdope.com/t/different-body-fluids-with-different-blood-types/744159 "2016-01-25T07:09:41Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Seanette](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/seanette/32/9139_2.png) [@Seanette](https://boards.straightdope.com/u/Seanette)\
**Post date:** [January 25, 2016, 7:09am UTC](https://boards.straightdope.com/t/different-body-fluids-with-different-blood-types/744159/1 "2016-01-25T07:09:41Z")

</div>

One of the strange things about Russian serial killer Andrei Chikatilo is that medical testing post-arrest showed that his blood and saliva were type A while his semen was type AB. [It’s stated](https://en.wikipedia.org/wiki/Andrei_Chikatilo#Blood_group_analysis) that as far back as 1988, Russian investigators were told of cases like this.

Unless he was a [chimera](https://en.wikipedia.org/wiki/Chimera_(genetics)) (not determinable, since he’s now dead), how is this possible?

---

<div class="post-metadata">

**Author:** ![Iggy](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/iggy/32/3364_2.png) [@Iggy](https://boards.straightdope.com/u/Iggy)\
**Post date:** [January 25, 2016, 1:15pm UTC](https://boards.straightdope.com/t/different-body-fluids-with-different-blood-types/744159/2 "2016-01-25T13:15:06Z")

</div>

Asked and answered.

Chimerism would do it. We are not entirely sure how often it happens.

I suppose a very specific mutation early in embryological development could do the same.

---

<div class="post-metadata">

**Author:** ![DocCathode](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/doccathode/32/18773_2.png) [@DocCathode](https://boards.straightdope.com/u/DocCathode)\
**Post date:** [January 27, 2016, 4:59am UTC](https://boards.straightdope.com/t/different-body-fluids-with-different-blood-types/744159/3 "2016-01-27T04:59:47Z")

</div>

I remember a film about Chikatillo. I think it was The Murders Department- I’ve looked for it on IMDB and been unable to find it (it had Donald Sutherland. I’m sure of that). One of the things I remember from the film is that the initial investigator got a lot wrong. They insisted that Chikatilo had blood of one type and semen of another. Later investigators insisted that the person just screwed up.

---

<div class="post-metadata">

**Author:** ![DocCathode](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/doccathode/32/18773_2.png) [@DocCathode](https://boards.straightdope.com/u/DocCathode)\
**Post date:** [January 27, 2016, 5:10am UTC](https://boards.straightdope.com/t/different-body-fluids-with-different-blood-types/744159/4 "2016-01-27T05:10:35Z")

</div>

Now that I finally have high speed net access (I’m borrowing somebody else’s with their express consent) I finally found the film. It’s Citizen X. Either the film misrepresents the issue or my memory is faulty.