Table 1.

Pathogenic bacteria samples.

Bacteria	Size	Morphology	Source	Infections
Gram negative
Escherichia coli	2 μm long, 0.25–1 μm diameter	Rods	Contaminated food, personal contact	Watery diarrhea, abdominal cramping, nausea, vomiting, urinary tract infection
Pseudomonas aeruginosa	1.5–3 μm long, 0.5–0.8 μm diameter	Rods	Water, soil	Dermatitis, cystic fibrosis, most bacterial cause of microbial keratitis in contact lenses wearers
Pseudomonas fluorescens	1–3 μm long, 0.5–0.7 μm diameter	Rods	Plants, soil, water surfaces	Blood transfusion-related septicemia, catheter-related bacteremia, peritonitis
Klebsiella pneumoniae	2 μm long, 0.5 μm diameter	Rods	Personal contact, indwelling catheters	Respiratory tract infections, urinary tract infections, endophthalmitis, skin and soft tissue infections, meningitis
Gram positive
Staphylococcus aureus	0.6 μm cell diameter	Coccal	Nose, respiratory tract, direct personal contact	Bloodstream infections, endocarditis, osteomyelitis
Bacillus subtilis	4–10 μm long, 0.25–1 μm in diameter	Rods	Soil	Food contamination
Enterococcus faecalis	0.6–2 μm by 0.6–2.5 μm	Coccal	Gastrointestinal tract	Urinary tract infection, endocarditis, abdominal and pelvic infection, septicemia