Exam 3 Notes

Exam 3 Notes - Exam 3 Microbiology Lab FLORA ON THE SKIN...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Exam 3 Microbiology Lab FLORA ON THE SKIN AND RESPIRATORY TRACK: -The body is mostly not a sterile environment -Rather, it is mutualistically colonized by thousands of microbes -Internal organs, blood vessels, cerebrospinal fluid, and urine are examples of sterile areas in the body -These bacteria which colonize our body are responsible for keeping potentially pathogenic strains from gaining a foothold in the body OPPORTUNISTIC PATHOGENS ARE BACTERIA WHICH NORMALLY ARE NOT DANGEROUS TO THE HOST -When normal flora from one anatomical site gain access to a different location then infection may result -Sometimes these are relatively trivial, but others may be life-threatening -Staphylococcus epidermidis/aureus is found frequently on the skin. However, if it gains access to an open wound, staph infections can occur -Streptococcus Pneumoniae is present in the upper respiratory tract of about half the population. If it invades the lower respiratory tract it can cause pneumonia. -Streptococcus Pneumoniae cause 95% of all bacterial pneumonia. -While E. Coli is a consistent resident of the small intestine some strains are pathogens that cause intestinal infections, urinary tract infections and neonatal meningitis. -Pseudomonas Aeruginosa is the quintessential opportunistic pathogen of humans that can invade virtually any tissue. It is a leading cause of hospital-acquired (nosocomial) Gram-Negative infections THE SKIN: -The surface of the skin is covered with microbes, mostly bacteria (around 37C) -Staphylococcus species probably represent the largest group, also Corynebacteria and Streptococcus. -Cuts, Scrapes, Surgeries often allow these microbes to exploit normally sterile regions (blood) -Infection may result, complicated by emerging antibiotic resistance -MRSA: Methicillin Resistant Staph Aureus -VRSA/VRE: Vancomycin Resistant Staph Aureus/Enterococcus THE RESPIRATORY TRACT:
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/23/2009 for the course BIO 201 taught by Professor Paquette during the Spring '09 term at Rhode Island.

Page1 / 4

Exam 3 Notes - Exam 3 Microbiology Lab FLORA ON THE SKIN...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online