normal flora pdf

At the end of the lesson the student will be able. Harmful Effect of Normal Flora 1.

Human Microbial Flora

The human body which contains about 10 13 cells routinely harbors about 10 14 bacteria Fig.

. Normal flora of the Oral cavity Nutrients Epithelial cells Secretions 19. Normal Microbial Flora The normal flora are bacteria which are found in on our bodies without causing disease. Blood brain muscle etc are normally free of microorganisms.

Fatty acids peroxides. This bacterial population constitutes the normal microbial floraThe normal microbial flora is relatively stable with specific genera populating. There are more bacteria living in our bodies.

The ileum contains a moderately mixed flora 10 6 to 10 8 g of contents. A human body contains around 1013 cells. - Has more bacteria than any other part of the body.

1- Protective functions competing for nutrients and receptors or directly through the production of antimicrobial. The flora of the large bowel is dense 10 9 to 10 11 g of contents and is composed predominantly of anaerobes. Local conditions select for those organisms that are suited for growth in a particular area.

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. Throat or pharynx 21. Trauma surgery burns Bacterium at one site may be commensal but might be pathogenic at another site.

Role of normal flora. Beneficial role of normal flora. - Many of the normal flora are opportunistic ie.

The Normal Flora of Humans Definition. An agent a microorganism that cause disease Indigenous flora. 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.

Normal flora of the gut provides important nutrients such as Vitamin K which aid in digestion and absorption of nutrients. 1 Body surfaces 2 Mucus membranes skin and mucous membranes are always contact with environmental organisms and become colonized by. When the normal flora are displaced from their normal site of the body eg.

An association between two species in which one benefits and the other is neither harmed nor benefited. One frequently cited statistic is that there are 10-100 times more bacterial than human cells in the body. These organisms participate in bile acid conversion and in vitamin K and ammonia.

An association between two species in which each benefits the other Pathogen. 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. Opportunistic flora Some normal flora become opportunistic pathogens Staphylococcus aureus Streptococcus mutans Enterococcus faecalis Streptococcus pneumoniae Pseudomonas aeruginosa etc Breach of skinmucosal barrier.

Microorganisms native or belonging naturally to a region Many bacteria commonly. -Also many fungi protozoa and viruses can live there. Microbiota of the human body has been an area of increasing interest in both research and the popular media.

The importance of the normal bacterial flora aka. When potential pathogens gain a competitive advantage. The human body is home to around 1014 bacteria.

However the surface tissues ie skin and mucous membranes are constantly in contact with environmental organisms and. Some pathogenic organisms may establish themselves in a host without manifesting symptoms the host is then referred to as a. Some normal flora become opportunistic pathogens Staphylococcus aureus Streptococcus mutans Enterococcus faecalis Streptococcus pneumoniae Pseudomonas aeruginosa etc Breach of skinmucosal barrier.

Ecoli causes urinary tract infection UTI if the site of habitat is changed. Trauma surgery burns Bacterium at one site may be commensal but might be pathogenic at another site. In normal hosts the duodenal flora is sparse 0 to 10 3 g of contents.

These microorganisms under normal condition live as commensal on host body but they causes diseases if opportunity is available. Parts have more no. A diverse microbial flora is associated with the skin and mucous membranes of every human being from shortly after birth until death.

MODULE Normal Flora of Human Body Microbiology 78 Notes 7 NORMAL FLORA OF HUMAN BODY 71 INTRODUCTION In a healthy human the internal tissues eg. Normal flora of GI tract ie. Organisms frequently found on or within body of healthy individuals In healthy human there are many of bacteria are consistently associated with the body.

99 of normal flora in the large intestine are anaerobic Bacteroides spp. Ecoli causes urinary tract infection UTI if the site of habitat is changed. 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.

Transient flora are inhabited for short period Origin of normal flora The human fetus is sterile until the birth membranes ruptures. Bloodstream infections by S. One fourth of fecal weight is made of bacteria.

Characteristics of Normal Flora Different body sites may have same or different flora depending on local conditions. View Normal-florapdf from EMBRO 1242 at University of Perpetual Help System Laguna. More recent calculations however result in a ratio closer to 11 with an.

Normal flora of GI tract ie. NORMAL FLORA OF HUMAN BODY By. These microorganisms under normal condition live as commensal on host body but they causes diseases if opportunity is available.