Complex sentence: Due to its opportunistic nature, "H. duboisii" infections can be found in HIV patients, particularly in those whose CD4 count is less than 50/mm 3, in which most were of the disseminated type, not localised.
Split into simpler sentences: Due to its opportunistic nature, "H. duboisii" infections can be found in HIV patients, particularly in those whose CD4 count is less than 50/mm 3. Almost all of the reported opportunistic infections of "H. duboisii" in HIV patients were of the disseminated type, not localised.