Thank you for your medical query at DoctorSpring.com
I understand your concern.
There is a very low chance ( not more than 0.5 % ) chance of HIV being spread from such injuries. Moreover, the prevalence is low in your country and you did not notice any blood on the hook. Considering all that, you should not worry. Even if someone is HIV positive, there is not more than 0.5-1 % chance of the infection being spread this way.
Please feel free to discuss further,