brian drozdowski cat1163 at HOTMAIL.COM
Sun Nov 30 20:06:25 EST 1997

To Whom It May Concern,
     My name is Brian Drozdowski and I am a microbiology student at The 
Philadelphia College of Pharmacy and Science.  A recent assignment for 
my cell biology class was to create a topic of my own from "hot areas" 
of research and update this topic.  The topic I created is titled 
"Genetic characterization of DNA band patterns by pulsed-field gel 
electrophoresis of methicillin-resistant Staphylococcus aureus to trace 
the source of nosocomial infections".  
     I am writing for answers to some questions concerning two recent 
articles by Dr. Alan Hartstein.   The articles are  "Control of 
methicillin-resistant Staphylococcus aureus in a hospital and an 
intensive care unit".  The second is "DNA typing and control of 
methicillin-resistant Staphylococcus aureus at two affiliated 
hospitals".  Both articles are found in Infection Control and Hospital 
    While updating my topic, I learned of several other methods that can 
be used for studying bacterial DNA.  Restriction endonuclease analysis 
of plasmids (REAP) is one of these methods.  What restriction enzyme was 
used for REAP in the first paper?  Do you believe that PFGE is the most 
discriminative method to use when studying MRSA or should PFGE be 
combined with  other methods such as REAP to generate the best results?
     Through my interest in the topic, I came across two ways of 
characterizing band patterns as being distinct from one another.  One 
method is if three or more bands are different, the other is if two or 
more are different.  Why did you the author chose to use three or more 
differences in band patterns as being distinct in the second paper?  
    Any quick response will be greatly appreciated.  Thank you for your 
                                     Brian Drozdowski
                                     cat1163 at  


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