Lactobacillus

Lactobacillus stain
“gram variable”

Young Culture = Gram (+)
Older Culture = Gram (-)
Morphology = Rod

=> Streak Plate:

• Medium: Tomato juice agar (Selective for low pH )
  
• Source: Saliva

=> Dental Caries Susceptibility Test:

• Medium: Snyder Test agar
• Indicator: Bromcresol Green
• Source: Saliva

Snyder test agar

Genus: Staphylococcus

Gram Positive Staph

Members of the genus Staphylococcus are gram-positive, spherical organism in grape-like clusters.