Microflora in human body

2. 1. Skin-
• Skin always harbour a variety of micro-organism that can either be resident or
transient microbiota.
• Resident organisms normally grow on the skin.
• Transient microorganisms are temporarily present on the skin.
• Example:- S.epidermidis, S.aureus ,P. acnes
2. Nose and Nasopharynx-
• Diptheroids, a large group of non-pathogenic gram-positive bacteria are
commonly found in nose and nasopharynx.
• Nasopharynx may also contain small number of potentially pathogenic bacteria
such as Streptococcus pneumonia, Neisseria meningitidis and Haemophilus
influenzae
• Example:- Staphylococcus aureus, Staphylococcus epidermidis

3. 3. Respiratory Tract:-
• Oropharynx consist of Streptococci, Neisseria.
• Lower respiratory track are protected by the action of ciliary epithelium cells and the
movement of mucus and are normally sterile.
• The microorganism are also removed by phagocytic activity of macrophages
• Example- Staphylococcus aureus, Streptococcus pyrogenes.
4. Mouth:-
• It contains micro-organisms that are able to resist mechanical removal by adhering
to the surface like the gums and teeth or get flushed to the stomach where they are
destroyed by hydrochloric acid.
• Streptococci produce a glycocalyx and various other adherence factor that enables
them to attach to oral surface.
• Example:- Stretococcus parasanguis, S. mutans , S. salivarius.

4. 5. Eye:-
• At birth and throughout human life a small number of bacterial commensals are
found on the conjunctiva of the eye.
• Few anaerobic organisms are also present.
• Low numbers of bacteria are present due to presence of high moisture, blinking
mechanically removes bacteria and Lachrymal secretion include lysozyme.
• Example:- Moraxella sp. , Staphylococcus epidermidis , S. aureus.
Staphyloccus epidermidis
Propionibacterium acnes