A 42-year-old man with no history of use of nonsteroidal anti-inflammatory drugs (NSAIDs) presents with recurrent gastritis. Infection with Helicobacter pylori is suspected. Which of the following statements is true?
A: Morphologically，the bacteria is a gram-positive，tennis-racket-shaped organism
B: Diagnosis can be made by serologic testing of urea breath tests
C: Diagnosis is most routinely achieved via culturing endoscopic scrapings
D: The most effective way to treat and prevent recurrence of this patient’s gastri-
E: tis is through the use of single drug therapy aimed at eradicating H. pylori E. The organism is easily eradicated