Extra (exam 2) Flashcards
At what temperature should a CSF sample be stored if it cannot be immediately taken to the laboratory?
Room temperature
What are the normal CSF values for the following..
Leukocytes
% polymorphoneuclear
Glucose (% of blood)
Protein mg/dl
Leukocytes - 0-5
% PMN - 0
Glucose - >60% (40-60mg-dl)
Protein mg/dl - <30
A 21 year old, immunocoptenent male, army recruit diagnosed with meningitis. What pathogen is the most likely cause?
Neisseria meningitidis
Describe the gram stain morphology for the following ... Haemophilus influenzae Streptococcus agalactiae Cryptococcus neoformans Neisseria meningitidis Streptococcus pneumoniae E. Coli Listeria monocytogenes
H. Influenzae: gram - pleomorphic
S. Agalactiae: gram + in chains
Cryptococcus neoformans: yeast
N. meningitidis: Gram - diplococcus
S. Pneumoniae: gram + in chains
E. Coli: gram - bacillus
Listeria monocytogenes: gram + bacillus
If a rectal swab or whole stool sample for bacterial pathogens cannot be immediately taken to the laboratory in a timely manner, what should be done with the specimen?
Place in transport media and refrigerate at 4C
Name two features of salmonella
Produces H2S gas
Ferments glucose
Name two features of vibrio species
Oxidase positive
Ferments glucose
Name two features of clostridium difficile
Smells like a horse barn
Anaerobic
Name two features of cryptosporidium
Parasite
Acid fast stain +
Name two features of campylobacter
Oxidase +
Growth at 42C
Name two features of STEC
Ferments glucose
Does not ferment sorbitol
A sensitive test that is used to differentiate between staphylococcus and streptococcus is…
Catalase ( staph is catalase positive and strep is catalase negative)
A coagulase positive test indicates that it is….
S. Aureus
Which characteristic/test result provides the initial categorization of streptococcus?
Hemolysis on SBA
Name four organisms that are typically associated with skin and/or joint infections
Enterococcus
Staphylococcus aureus
Streptococcus agalactiae
Streptococcus pyogenes
