It’s not a deadly disease it’s a parasite. Though I do believe humans are the primary hosts. Filtering water, using deep Wells or anti-parasitic drugs are what’s driving down the number of cases.
Your link actually states "There is no medication or vaccine against the disease."
It's a disease (a set of symptoms) and a parasite (the cause of the symptoms / disease). It is not bacterial or viral. If we're looking for accurate words.
Ah, I didn't even notice the contention over the word 'disease'. I just found it notable that there are no anti-parasitic drugs for it, according to the WP article.