Official English Transcript
"Please note that due to errors and mistranslations in official English localization, the following text may contain inconsistencies with the official Japanese text and series storyline, and should not be treated as canon. For a more accurate translation, please view the Project Umbrella translation above."
LUIS' MEMO 5
From the initial stages of the research, we have been searching for a safe and practical removal procedure of the Plaga.
Ironically, it turns out that the real objective of this research was not to find a way to remove the Plagas from the infected persons but to find a way so that the Plaga could not be removed from the body easily.
In the end, we were able to find out that the Plagas could be removed only by exposing them to a special radiation. The only drawback with this method is that it is a very painful procedure. Since the Plaga attaches itself to the nerves, there is a possibility that it may impair the consciousness of the host.
Another fact that must be mentioned is that once the Plaga grows into an adult, the removal procedure could kill the host.
But perhaps death isn't so bad when you think about the alternative.