Table 1. Gram stain results

	Gram stain	Shape
Serratia marcescens	Gram negative	short rods
Micrococcus luteus	Gram positive	cocci (in tetrads)
Staphylococcus epidermidis	Gram positive	cocci
Pseudomonas aeruginosa	Gram negative	bacilli
Bacillus subtilis	Gram positive	bacilli

 

Table 2. Results from antibiotic resistance exercise (all measurements for the radius of the zone of inhibition are in mm)

bacteria	penicillin	chloramphenicol	tetracycline	nalidixic acid	erythromycin	kanamycin	nitrofurantoin
Serratia marcescens	0	12-16	0	7-10	6-8	6-8	5-7
Micrococcus luteus	15-20	15-20	12-17	0	17-19	6-9	0
Staphylococcus epidermidis	0	10-13	5-6	----	10-12	6-8	0
Pseudomonas aeruginosa	0	0	6-9	----	0	4-6	0
Bacillus  subtilis	14-16	16-20	17-22	----	17-21	7-10	----