<p>A facility based cross-sectional study design was conducted among 377 people currently on ART in Wolaita zone by using systematic random sampling technique, Data were collected by using a pre-tested interviewer-administered semi-structured questionnaire. The collected data were entered into Epi-info 7.2 and exported to SPSS version 26 for analyses. Bivariable and multivariable logistic regression analyses were used to identify factors associated with index case family testing. The strength of association was assessed by adjusted odds ratio, and statistical significance was declared at a p-value &lt;0.05 and 95% CI.</p>