[Hajman]

How is the case for the typhoid bacilli any different from the case for the fetus?

The fetus isn't a parasite.

-The Hajman-

[donh]

The fetus isn't a parasite

This is a matter of biological viewpoint, without much bearing on moral discrimination, lacking any more detailed argument. The fetus qualifies as a parasite in every appreciable biological way if it is unwanted.