Helicobacter pylori can grow in the stomach because it secretes the
enzyme called urease which aids to neutralize the acidic environment of
the stomach.
Stomach has an acidic environment and helps in the destruction of harmful
microorganisms. Bacteria such as helicobacter pyloria infects the stomach
and causes inflammation and ulcer. It also produce an enzyme called
urease.
The urease produced is usually converted into ammonia which neutralizes
the acidic content of the stomach thereby making it habitable for the
bacteria.
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