The initial case report is by Gulden et al., reporting the case of a 67-year-old male living with HIV who presented with severe symptomatic hypocalcaemia (ionised calcium of 0.98 mmol/L) and primary hypoparathyroidism (PTH of 1.30 pmol/L) despite having sufficient vitamin D levels [15]. The gene discussed is PTH; the disease is Hypocalcemia.