Dr. Kaaldar inoculates Luke Skywalker with the serum.
The serum designed to combat Bledsoe's disease functioned as a preventative measure against the deadly effects of the affliction.
Kaaldar, a Doctor, both developed a variant of the disease and then formulated this serum. The serum's effects weren't immediate; during a short interim, the infected individual's symptoms were lessened, but they remained capable of spreading the disease until their body completely eliminated it.
Around 0 ABY, Luke Skywalker was infected with Bledsoe's as a result of a bite from a squill on Tatooine. With the aid of Anduvil, he infiltrated the Imperial garrison base, where they compelled Dr. Kaaldar to administer the serum to Luke, thus saving his life.