Skin Bacteria Flashcards
major function of skin
body’s physical barrier to the outside world
flora
skin microbiome or microbiota
mutualistic microorganism
offer a benefit to the host
mutualistic microorganism role in the skin
T-Cells developing immunity so it can react against sever strain of colonizing organisms
commensals organisms
not harmful to the host
moist areas on the body
- axilla
- perineal area
- b/w toes
dry body part
legs
oily body parts
nose and face
when does colonization begin
immediately after birth
does the delivery type impact when colonization begins
no it is the same regardless of C section or vaginal birth
where is bacteria colonization present in adults
on normal intact skin
the amount of bacteria colonization on normal intact skin
10^12
1000 species
why does bacteria number and types have little change on the skin
the skin has an acid mantle with a pH < 5
outer layer of skin is constantly sheding
what keeps the resident bacterial flora attached to the skin
pH 4-4.5
what promotes the dispersal from the skin
pH 8-9
according to the study which gender has more acidic skin
women
why might a women’s pH be higher than men
- hormones
- sweat
- sebum production
why does bacteria vary by site
b/c skin varies in thickness, areas with folds, sebaceous and sweat glands , hair follicles
bacteria on dry skin
- B- proteobacteria
- flavobacterials
bacteria on moist skin
- coryneabacteria
- staphylococci
bacteria on oily skin
- propionibacteria
- staphylococci
symbiotic describes
the relationship b/w skin and its outer colonies of bacteria (externally or internally)
infection =
of organisms x organism virulence / host immune function
hand hygiene research agenda
- educate/promote
- hand hygiene agents and hand care
- lab based and epidemiologic research and development
