Interactions between bacteria and the human host Flashcards
what pH is the skin?
acidic.
what type of gram is the normal flora on the skin?
gram positive.
what areas are more prone to bacteria on the skin?
moist areas such as axilla.
what type of bacteria live in nose and oral cavity?
- mainly anaerobic bacteria.
- both gram positive and negative bacteria.
how many bacteria are present in saliva?
not many.
how do dental caries happen?
- bacteria convert sucrose to lactic acid.
- lactic acid breaks down the enamel on teeth
- therefore, low sucrose diets reduce dental plaque.
how much flora is on the upper respiratory tract?
many.
how much bacteria in lower respiratory tract?
not much.
how much bacteria in lungs?
no.
what happens to the pH as you go further down the GIT?
increase.
what happens to the number of bacteria as you go down the git?
increase.
what type of bacteria are present in large intestines?
large amount of bacteria. mainly gram positive, anaerobic bacteria.
what bacteria are found in upper urethra?
hardly any.
what bacteria are found in lower urethra?
many.
what are the steps in spread of disease?
- transmission to host.
- entry into the body
- avoid/overcome host defences.
- growth and spread.
- damage to the host.
