chapter+26+fall08

chapter+26+fall08 - Chapter 26 Microbial Diseases Skin and...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 26 Microbial Diseases Skin and Soft-Tissue Infections Staphylococcus aureus Boils/ pimples—walled off from body with fibrin Impetigo- skin infection “Scalded skin” syndrome- due to exfoliative toxin Can produce hemolysins, superantigen enterotoxin A (food poisoning), coagulase, leukocidin, superantigen TSST (toxic shock syndrome) Can also cause pneumonia and meningitis Treatment with penicillins MRSA—methicillin-resistant S. aureus Horizontal transfer of drug-resistant genes Evolved in environment with high levels of antibiotics Hospitals—nosocomial infections Resistant to all drugs except vancomycin Streptococcus pyogenes 60+ strains strep throat (pharyngitis) – 5~10% of sore throats diagnosis- blood agar: slow;antibody test: rapid infections of the inner ear impetigo- skin infection Rheumatic fever – autoimmune; antibodies against S. pyogenes react with host tissue – damages heart valves necrotizing fasciitis (“flesh eating”) Many viruses can cause skin rashes Usually infect through respiratory tract Chickenpox caused by Varicella-zoster virus (VZV), a herpesvirus VZV can lay dormant in nerve cells for long periods of time. Shingles is caused by the migration of VZV to the skin; painful blisters Measles/ rubeola caused by a paramyxovirus Symptoms- fever, cough, rash Mumps- inflammation of salivary glands Rubella/German measles Caused by a togavirus symptoms - similar to measles but milder Can be prevented with MMR vaccine Many fungal skin infections Respiratory Tract Infections Most respiratory pathogens are transferred from person to person via respiratory aerosols – coughing, sneezing, talking, breathing Transmission usually occurs over short distances because microorganisms survive poorly in air. Pathogens that can survive dry conditions such as many Gram positive & Mycobacteria are easier to transmit by air Streptococcus pneumoniae- lower repiratory diseases; can also cause meningitis
Background image of page 1

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

View Full DocumentRight Arrow Icon
pneumococcal pneumonia Inflammatory reaction in alveoli Usually a secondary infection Capsule protects organism from phagocytosis untreated- 30% mortality rate Symptoms = sudden onset of chills, labored breathing, pleural (chest) pains Pneumonia can also be caused by viruses, other bacteria, or fungi S. pneumoniae is found in respiratory flora in about 40% of healthy people Corynebacterium diphtheriae Childhood upper respiratory infection, diphtheria. Pathogen strains of
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/04/2009 for the course BIOL 2051 taught by Professor Brininstool during the Fall '07 term at LSU.

Page1 / 8

chapter+26+fall08 - Chapter 26 Microbial Diseases Skin and...

This preview shows document pages 1 - 3. Sign up to view the full document.

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