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?

PS -- It's the rare compound sentence that DOESN'T need a comma!!

Yes I did the site was very helpful. We are going through our print out now..thank You

You're very welcome. =)

You are correct! In this case, a comma is not necessary because the sentence does not contain independent clauses joined by a coordinating conjunction. A compound sentence typically consists of two or more independent clauses joined by a coordinating conjunction such as "and," "but," or "or." In your example, there is only one independent clause ("The physician discussed problems faced by everyone") followed by a coordinating conjunction ("and") and then a dependent clause ("the response was positive"). Therefore, a comma is not needed in this compound sentence.