Slide 1. Escherichia coli
This Gram stain shows neutrophils and numerous plump, gram-negative bacilli that vary little in size or shape.

Slide 2. Proteus mirabilis
These short to medium-long gram-negative bacilli look like typical enteric gram-negative bacteria; isolation of Proteus mirabilis confirmed that impression.

Slide 3. Citrobacter diversus
These short, slender gram-negative bacilli look like enteric bacteria. The culture grew Citrobacter diversus.

Slide 4. Acinetobacter baumanii
Some of the short, fat, pleomorphic gram-negative bacilli resemble cocci, others diplococci. The variety of shapes is typical of this organism, which can be confused with Neisseria species.

Slide 5. Lactobacillus species
These long, slender gram-positive bacilli are part of the normal vaginal flora. Their presence in a urine specimen suggests that improper technique in its collection resulted in contamination with vaginal secretions.

Slide 6. Staphylococcus saprophyticus
These gram-positive cocci in clusters look like staphylococci. Various species of coagulase-negative staphylococci, especially Staphylococcus saprophyticus, can cause urinary tract infections, particularly in young women.