labCE

Question 1

if CSF tubes numbered #1, #2, and #3 CANNOT be analyzed within one hour, the correct procedure for the microbiology sample tube is to ?

Answer 1

leave it at room temperature because *You must leave the tube at room temperature since refrigerating, freezing, or incubating the specimen at 56 degrees will destroy Neisseria meningitides (if present). The sample should not be thrown away.

Question 2

which phase of the bacterial growth curve demonstrates the greatest growth activity?

Answer 2

log phase

*Bacteria have a characteristic growth curve that all bacteria follow called lag phase, log phase, stationary phase and death phase. In Lag Phase cultures of bacteria gain the necessary nutrients from the growth medium, but have not started to grow or multiply. In Log Phase the bacteria rapidly multiply. During Stationary Phase bacterial cells die at the same approximate rate that they get produced, so no real growth is gained, although cell are still being produced. Finally, in the Death Phase bacterial cells begin to die faster than they are produced.

Question 3

the most frequent cause of bacterial meningitis in older adults is:

Answer 3

streptococcus pneumoniae

*H. influenzae type b usually causes meningitis in infants and children. N. meningitidis usually causes meningitis in children and young adults. Streptococcus pneumoniae usually causes meningitis in adults. Other organisms can also cause bacterial meningitis, particularly Group B streptococci, and Listeria monocytogenes in infants and adults, and E. coli in infants.