Microbiology-Normal Flora

Bacteria found naturally in the body that prevent infection and promote health ("friendly bacteria")

organisms living in a close relationship in which one benefits from the relationship, and the other neither benefits nor is harmed

infections that occur when the body's defenses are weak
S.aureus and MRSA

keep the populations for harmful bacteria low

not a good environment for bacteria, pH 5-6, dry, most abundant on hands, fingernails, joints
Staphylococcus, S.aureus, Sarcina lutea, bacillus, yeast

low bacteria levels because of tears
Lysozymes: enzymes that rupture bacteria cells
infections include: S.pneumoniae (pink eye)
many gram- rods

nasal passages, pharynx, larynx
hairs in nose filter, mucus membranes, work on the portal of entry, S.pneumoniae, Neisseria meningitides

trachea, bronchi, alveoli
don't want any bacteria here
S.pneumonia, TB, many viruses

good amount of bacteria grows in large intestine
a lot of bacteria resides in appendix
pH 7, good moisture control, lots of carbs
lactobacilli, s.mutans, e.coli, strep throat

no flora, HCl (pH 2-3)
Heliobacter pyloria-linked to ulcers

in the upper 12 feet (very acidic from stomach)
lower 3 feet: lactobacillus, streptococcus, staphylococcus, yeast
a lot of microbes

very versatile opportunistic bacteria
anaerobic gram-, anaerobic gram+, vibrio, bacteriode gram- rods, clostridium, and facultative gram-
e coli, klebsiella, lactobacillus, acidophiles
if population declines, results in diarrhea

urine is acidic, not many bacteria will grow pH 6
UTI due to pH change

streptococcus, staphylococcus, yeast
STDs- "not normal" (thank you Parsons)

bacteria are not normally found here pH 7.35-7.45
your white blood cells destroy bacteria
most microbes found here are viruses
HIV, hepatitis, Mono (no kissing)

hijack cells