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For example, how are infections of antibiotic resistant strains of MRSA, Streptococcus, or Gonorrhea treated?

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Welcome to Biology, this question is about treatment of disease, a purely medical subject which is off-topic here (see this meta post on our discussion on that. Questions about the biological basis of diseases are welcome, but questions about treatment are off-topic here. –  Mad Scientist Mar 3 '12 at 9:09
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lots of biologists and biochemists study this topic. why be so over defined? This question should be answerable here. in my opinion. The first line treatment for such things is to use rare and expensive antibiotics that still can work like Vancomycin. antibiotic resistant strains keep popping up because (among other reasons) people don't take all their antibiotics and this creates an environment for more antibiotic resistance to develop through selection. SEe ted.com/talks/paul_ewald_asks_can_we_domesticate_germs.html –  shigeta Mar 3 '12 at 15:10
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A second vote for reopening. The question is not "What drugs should I use to treat X", the question is how they are treated. That question is very much in the domain of microbiology and epidemiology, neither one of which are medical fields. –  Fomite Mar 6 '12 at 18:08
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There are a number of ways to address antibiotic resistance in infectious bacteria. What one gets used depends on exactly what organism we're talking about. But below is a short list of some ways:

  1. Changing the antibiotic being used. Not all antibiotics have the same molecular target within a bacterial cell. Some interfere with the formation of the cell wall, others interfere with protein synthesis, some mess with DNA replication, etc. Similarly, resistance mechanisms don't work equally well on all antibiotics. So often the solution is simply to switch antibiotics. Or, quite often, treating all infections with a combination of drugs that should get around most resistance. This is why you see people getting skittish about things like multi-drug resistant organisms - because it removes this solution.
  2. This isn't as much a treatment as a preventative measure, but increasing antimicrobial stewardship and the appropriate use of antibiotics to prevent widespread resistance from arising in the first place.
  3. The use of non-antibiotic antimicrobials. The most "common" of these is phage therapy - using preparations of bacteriophages that naturally prey on the infecting pathogen to help combat the infection. This was a major "contender" for how we treated antibiotic infections, but has fallen away due to a bad reputation early in its history (due to difficulties purifying phage treatments) and the discovery of antibiotics which were vastly easier to use. But there's still ongoing research, and it may pose a potential to help treat highly resistant infections in the future.
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