<prompt> A 28-year-old lady presented with, headache, kernigs sign positive, culture showed gram positive bacilli, most probable organism is:Listeria monocytogenesH. influenzaMeningococciStreptococcus pneumoniae  <response>: Ans. a i.e. Listeria monocytogenes Among options provided listeria is the only Gr positive bacilli. Listeria accounts for 10 of cases of community acquired bacterial meningitis. For details see previous answers. 