<prompt> The most common organism amongst the following that causes acute meningitis in an AIDS patients is -Streptococcus pneumoniaeStreptococcus agalactiaeCryptococcus neoformansListeria monocytogenes  <response>: the typical CNS oppounistic infections are toxoplasmosis and cryptococcosis REF:ANANTHANARAYANAN TEXT BOOK OF MICROBIOLOGY 9EDITION PGNO.576 