Lumbar puncture shows elevated levels of polymorphs ( 20 - 70 % of cases ) .
Lumbar puncture occasionally raised eosinophil counts ( 0 - 30 % of cases ) .
Lumbar puncture shows elevated levels of polymorphs ( 20 - 70 % of cases ) and occasionally raised eosinophil counts ( 0 - 30 % of cases ) .