Use of the Force in the OT

[Set Harth]

Couldn't people be injected with midiclorians to increase their count?

At this very moment, elsewhere in teh internetz, certain people are theorizing something like that happened with Starkiller in TFU.

While some medical theories postulated that the midi-chlorians created the connection between more macroscopic organisms and the Force, some Jedi believed that, contrarily, the midi-chlorians were created by the Force to serve as the link between it and other life.

The "contrarily" in the above seems somewhat dubious, depending on how the passage is meant to be read. If one clicks on the link for the source, it turns out to be Jedi Healer. So it stands to reason that examination of a similar passage in another book by one of the same authors might prove useful ( bolding mine ):

There were two theories as to how this was possible, which Rhinann felt were not necessarily mutually exclusive. One was that the ability to access the Force was based on a kind of apperception precipitated and augmented by endosymbiotic cellular organelles called midichlorians. The other theory held that the Force itself somehow brought into being those same midichlorians in order to facilitate its connection and thus manifest itself to varying degrees of potency in various species and individuals.

Putting aside the issue of specific authors and their tendency to introduce supposed dissent in the Jedi ranks where otherwise in canon said dissent does not really exist, there is reason for Rhinann's stated belief that the "two theories" are not necessarily mutually exclusive. Even in the allegedly "contrary" second theory, it is still said that the midichlorians facilitate the Force connection. Notably, on the same wikipedia page quoted above, we see the following ( another Street of Shadows reference ):

Counts as low as 2,000 midi-chlorians per cell provided no sensitivity to the Force.

The TPM novelization also makes it clear that potential in the Force is provided by midichlorian count, as Qui-Gon's dialogue in the film strongly implied:

That extraordinarily high midichlorian count gave the boy a connection to the Force that even Jedi Masters on the order of Yoda might never achieve.

 

[Hound of UIster]

Couldn't people be injected with midiclorians to increase their count?

No if they are like mitochondria and chloroplasts, they live within the cell.