Life is essential energy force.
Gita shloka says alive is one who has life and life less is termed as dead. Aids is nothing but inability of our immure system to withstand the onslaught of diseases. So it's the presence or the absence of energy which defines the life. Different level and direction of energy force decide and form the various conditions of life viz. Every woman in the universe desires to be a mother so that the she can be helpful to extend the family to fulfill the purpose of existence.