normal flora pdf

Harmful Effect of Normal Flora 1. -Also many fungi protozoa and viruses can live there.

Normal Human Flora

A diverse microbial flora is associated with the skin and mucous membranes of every human being from shortly after birth until death.

. Local conditions select for those organisms that are suited for growth in a particular area. Some pathogenic organisms may establish themselves in a host without manifesting symptoms the host is then referred to as a. Ecoli causes urinary tract infection UTI if the site of habitat is changed.

Parts have more no. These microorganisms under normal condition live as commensal on host body but they causes diseases if opportunity is available. The ileum contains a moderately mixed flora 10 6 to 10 8 g of contents.

When potential pathogens gain a competitive advantage. The Normal Flora of Humans Definition. Fatty acids peroxides.

1 Body surfaces 2 Mucus membranes skin and mucous membranes are always contact with environmental organisms and become colonized by. Opportunistic flora Some normal flora become opportunistic pathogens Staphylococcus aureus Streptococcus mutans Enterococcus faecalis Streptococcus pneumoniae Pseudomonas aeruginosa etc Breach of skinmucosal barrier. One fourth of fecal weight is made of bacteria.

The human body which contains about 10 13 cells routinely harbors about 10 14 bacteria Fig. Normal Microbial Flora The normal flora are bacteria which are found in on our bodies without causing disease. Normal Bacterial Flora Bacterial Virulence Factors Mechanisms of Pathogenicity Host Defense Mechanisms Selected Bacterial Diseases Review lecture materials on BacteriaHost Intreactions Distruption of Normal Flora Trauma - appendix rupture dental.

More recent calculations however result in a ratio closer to 11 with an. The flora of the large bowel is dense 10 9 to 10 11 g of contents and is composed predominantly of anaerobes. Table2 Characteristics ofwomenwithBVcandidiasis andnormalmicroscopy Normal Candida BV pvalue Variable n 8 n 8 n 10 BVvsnormal Averageagerange 394 35-6 405- Sexuallyactive 8 7 9 0-91.

Harmless or beneficial population of microorganisms or plant life that normally occur in specific areas of the body or the environment. - Has more bacteria than any other part of the body. Normal flora of GI tract ie.

This bacterial population constitutes the normal microbial floraThe normal microbial flora is relatively stable with specific genera populating. - Many of the normal flora are opportunistic ie. After birth the infant is exposed to the flora of the mothers genital tract to the skin and respiratory flora of those handling delivery and.

These organisms participate in bile acid conversion and in vitamin K and ammonia. Role of normal flora. Trauma surgery burns Bacterium at one site may be commensal but might be pathogenic at another site.

Throat or pharynx 21. Normal flora of GI tract ie. These microorganisms under normal condition live as commensal on host body but they causes diseases if opportunity is available.

Normal flora of the Oral cavity Nutrients Epithelial cells Secretions 19. Normal flora of the gut provides important nutrients such as Vitamin K which aid in digestion and absorption of nutrients. Trauma surgery burns Bacterium at one site may be commensal but might be pathogenic at another site.

99 of normal flora in the large intestine are anaerobic Bacteroides spp. Characteristics of Normal Flora Different body sites may have same or different flora depending on local conditions. Because of the normal flora occupy bodys epithelial surfaces they are able to prevent other bacteria from establishing themselves by blocking receptors attachment competing for essential nutrients or producing anti-bacteria substances.

There are more bacteria living in our bodies. In normal hosts the duodenal flora is sparse 0 to 10 3 g of contents. Normal Flora National Cancer Institute Source National Cancer Institute.

1- Protective functions competing for nutrients and receptors or directly through the production of antimicrobial. Bloodstream infections by S. Microbiota of the human body has been an area of increasing interest in both research and the popular media.

One frequently cited statistic is that there are 10-100 times more bacterial than human cells in the body. Beneficial role of normal flora. A human body contains around 1013 cells.

The importance of the normal bacterial flora aka. The human body is home to around 1014 bacteria. Some normal flora become opportunistic pathogens Staphylococcus aureus Streptococcus mutans Enterococcus faecalis Streptococcus pneumoniae Pseudomonas aeruginosa etc Breach of skinmucosal barrier.

When the normal flora are displaced from their normal site of the body eg. Organisms frequently found on or within body of healthy individuals In healthy human there are many of bacteria are consistently associated with the body. Transient flora are inhabited for short period Origin of normal flora The human fetus is sterile until the birth membranes ruptures.

Ecoli causes urinary tract infection UTI if the site of habitat is changed.

Pdf Defining The Normal Bacterial Flora Of The Oral Cavity