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How to write H. pylori

Helicobacter pylori
Edited by: Lyudmila Boyanova
Current knowledge and recent research for microbiologists, clinicians and advanced students working with Helicobacter and for those wishing to enter the field.
"up-to-date" (Book News); "a well organized book" (Doodys) read more ...

The CORRECT way to write H. pylori is:

                 H. pylori

Note the following:

  • The uppercase "H" and the lowercase "pylori" in H. pylori
  • The dot (period, full stop) after the "H" in H. pylori
  • The single space after the dot in H. pylori
  • H. pylori should be in italics

INCORRECT ways to write H. pylori are:

  • H. pylori (incorrect because it is not in italics)
  • H.pylori (incorrect because there is no space after the dot)
  • H. Pylori (incorrect because of uppercase "P")
  • H. PYLORI (incorrect because of uppercase "PYLORI")
  • h. pylori (incorrect because of lowercase "h")
  • H.-pylori (incorrect because hyphen used instead of a space)

Please note in particular:

  • Always use italics to write H. pylori
  • Always use a single space after the dot (i.e. before "pylori") in H. pylori
  • Always use an uppercase "H" in H. pylori
  • Always use lowercase "pylori" in H. pylori
  • Never use an uppercase "P" in H. pylori, not even in headlines or headings
  • Never use uppercase PYLORI in H. pylori, not even in headlines or headings
  • Never use a hyphen in H. pylori

To be absolutely correct:

  • Write Helicobacter pylori the first time you refer to the microbe in your report, article, or story
  • Everywhere else in the same report, article, or story use the abbreviated form: H. pylori