Table 4.

Microbial studies among patients on ventriculostomy in Tikur Annbessa specialized referral Hospital, from Jan 1, 2009 to Jun 30, 2018

Variables	Frequency	Percent (%)
CSF Gram's stain (n=93)
Gram positive	2	2.2
Gram negative	9	9.7
No Bacteria seen	74	79.6
Other aspect (not done)	8	8.6
Organism growth on CSF culture (n=93)
Yes	26	29.0
No	67	71.0
How many times culture positive (n=26)
Once	20	76.9
twice	4	15.4
three times	2	7.7
List of organisms (n=26)
K. Pneumoniae	9	34.6
Acinetobacter	8	30.8
Pseudomonas	2	7.7
E.Coli	1	3.8
Enterobacter and Acinetobacter	1	3.8
K. Pneumoniae and SerratiaSpp	1	3.8
K. Pneumoniae and Acinetobacter	1	3.8
K. Oxytoca	1	3.8
Staphylococcus Aureus	1	3.8
Viridans Streptococcus	1	3.8
The organism/ organisms sensitive for ceftazidime + vancomycin (n=26)
Yes	5	19.2
No	21	80.8
The organism/ organisms sensitive for meropenem (n=26)
Yes	11	42.3
No	15	57.7
Sensitive for other drugs (n=26)
Amikacin	14	53.8
Amoxicillin/clavulanate	1	3.8
Othersdrugs	11	42.3

Others drugs Include: Tobramycine, Choramphenicol, Erythromycin, Clindamycin, cloxacillin, Cefoxitin, Doxycycline, Tetracycline and polymyxin