The most common organism amongst the following that causes acute meningitis in an AIDS patient is -
Streptococcus pneumoniae
Streptococcus agalactiae
Cryptococcus neoformans
Listeria monocytogenes
Cryptococcosis is the predominant cause of fatal fungal infection and causes acute... meningitis in patients with AIDS.
It may occur most common when CD4+ count falls below 200 cells/mm3.
The extra pulmonary cryptococcosis is one of the AIDS defining diseases.