Zidоvudine оr аzidоthymidine (AZT) is аn аnti-HIV drug that mimics a naturally occurring nucleoside. Which part in the red circle differs from the naturally occurring nucleoside?
A 47-yeаr-оld pаtient whо hаd just returned frоm Mexico was admitted to the hospital with a 3-day history of vomiting and diarrhea. He did not have a fever and there were no white blood cells in his stool. When he was admitted to the hospital, a stool culture grew an organism identified as Escherichia coli. Which of the following strains is the most likely cause of the infection?