Joe is a sexually promiscuous 22-year-old who has had gonorrhea five times in the past 2 years. Each time he went to the doctor, he was given antibiotics, and the infection cleared up. List at least...

Joe is a sexually promiscuous 22-year-old who has had gonorrhea five times in the past 2 years. Each time he went to the doctor, he was given antibiotics, and the infection cleared up. List at least two reasons why N. gonorrhoeae was able to cause recurrent infections in Joe. Could Joe be vaccinated to avoid these recurring infections? Why or why not?