Niamh, a 32-year-old woman from Chugiak, was diagnosed with a severe viral illness. Her treatment (which was appropriate for her illness) included the antiviral drug phosphonomethanoic acid. In the weeks following her treatment, Niamh found that she was always thirsty, had to drink water constantly, and produced a large volume of very dilute urine.
Niamh's symptoms did not go away with time, and further diagnostic testing showed that the artificial administration of ADH had no effect on Niamh's symptoms. No matter how much ADH Niamh was given, she continued to be thirsty, drink constantly, and produce large volumes of dilute urine.
Niamh's case is most likely to be an example of:
Type I Diabetes mellitus.
Type II Diabetes mellitus
Central Diabetes insipidus
Nephrogenic Diabetes insipidus
Gestational Diabetes insipidus