This paper analyses the HIV/AIDS dynamic evolution as defined by CD4 levels, from a
macroscopic point of view, by means of homogeneous semi‐Markov stochastic processes. A
large number of results have been obtained including the following conditional probabilities:
an infected patient will be in state j after a time t given that she/he entered at time 0 (starting
time) in state i; that she/he will survive up to a time t, given the starting state; that she/he will
continue to remain in the starting state up to time t; that she/he reach stage j of the disease in …