jinkytoldu'e lujvo

t1=j1 is an immune-system deficiency of j2.

From jinku, toldu'e. t2, t3, j3, j4 based on relative uselessness (you could use tanru to get what type-of immune deficiency you're referring at).

In notes:

remjinkytoldu'evidru
v1=jt1=r1 is HIV [Human immunodeficiency virus] of jt2.
smanyjinkytoldu'evidru
v1=jt1=s1 is SIV [Simian immunodeficiency virus] of jt2.