The physician discussed problems faced by everyone, and the response was positive.
This is a compound sentence I would think no comma is necessary.
Please don't switch names. It's unnecessary.
http://grammar.ccc.commnet.edu/grammar/commas.htm
#2
Sorry Writeacher we are having a study group and we are all using same pc. I will tell all we can use same name...thank You
OK.
Did you get the idea about commas and compound sentences?