Dear Doctor: I had a urinary tract infection that improved on the antibiotic Keflex, but lab tests showed the bacteria was actually resistant to the Keflex, so I had to switch to a different antibiotic. I don’t understand -- if the infection was resistant, why did the symptoms go away?
Dear Reader: Urinary tract infections, or UTIs, are
one of the most common bacterial infections in the U.S. They oc…