Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
14 Cards in this Set
- Front
- Back
|
General characteristics of Mycoplasma
|
Pleomorphic, NO CELL WALL
resistant to cell wall antibiotics (penicillins, cephalosporins) unable to Gram Stain slow grow, fastidious, aerobes or facultative anaerobes |
|
|
What are L-forms?
|
Cell wall deficient bacteria that arise from environmental stress. They are NOT mycoplasma
|
|
|
Morphology of Mycoplasma
|
many forms: spherical, pear-shaped, filamentous
0.2 to 0.8 um in diameter stain w/ ACRIDINE ORANGE Dienes stain for observing colonies Gliding motility on liquid covered surfaces |
|
|
Cultivating Mycoplasma
|
Very sensitive to desiccation
culture media: beef extract, horse serum, yeast extract w/ nucleic acids. Horse serum for cholesterol needed for sterols in membrane 1-6 hr generation time fried egg appearance, very small |
|
|
Characteristics of Mycoplasma pneumoniae
|
Primary atypical pneumonia
upper/lower respiratory pathogen, NOT commensal walking pneumonia: close contact areas (college, barracks) Dx formerly from cold agglutinins, now PCR & Serology |
|
|
Characteristics of Mycoplasma hominis
|
Colonizes genital tract of 1/2 healthy adults
Causes upper genitourinary tract infection in females: salpingitis, pyelonephritis, PID, postpartum fever |
|
|
Characteristics of Ureaplasma urealyticum
|
Colonize male/female gential tracts
Hard to know disease role - high carrier state in sexually active Non-gonococcal urethritis in men and upper genitourinary tract infection in women Assoc w/ reprod disorders, low birthweight w/ respiratory disease found in spinal fluid in infants |
|
|
Characteristics of Chlamydiaceae
|
resemble gnr
obligate intracellular parasites (can't make ATP) prefer columnar epithelia lining mucous membranes cultivated in susceptible tissue unique replication cycle |
|
|
Characteristics of Chlamydia psittaci
|
Psittacosis, parrot fever, ornithosis
found in wild birds treat w/ erythromycin, tetracycline |
|
|
Characteristics of Chlamydia trachomatis
|
3 Disease states:
1- conjunctivitis 2- Lymphogranuloma venereum 3- urethritis, PID, infertility, premature birth, cervical infection ID'd by Serology, DFA, PCR |
|
|
Characteristics of Chlamydia pneumoniae
|
aka TWAR / a cause of pneumonia
common among students pharyngitis followed by flu-like lower respiratory symptoms possible involvement in Coronary artery disease, asthma ID: serology, HL, PCR |
|
|
Characteristics of Rickettsiae
|
Gram NEGATIVe, obligate intracellular parasites
most can't be cultivated on ordinary media: need hen eggs, lab animals or cell culture Arthropod vectors, xcept in Q fever RMSF 90% of rickettsial disease in US |
|
|
Characteristics of Coxiella burnetti
|
Q fever, recovered from urine, feces, milk of animals & ticks.
can form endospore single organism is pathogenic Usually manifested as pneumonia ID: complement fixation treated by tetracycline |
|
|
Characteristics of Rickettsia
|
systemic disease, fever, rash, chills
ID by serology RMSP = R. rickettsii Murine Typhus = R. typhi |
