http://www.ncbi.nlm.nih.gov/pubmed/20531946BACKGROUND:
Pregnant women have been identified as a group at risk, both for respiratory complications than for the admissions to the Intensive Care Unit (ICU) during the 2009 H1N1 influenza
pandemic (pdm). The purpose of this prospective register-based cohort-study was to characterize the clinical virulence of the pdm (H1N1/09)v during pregnancy in La Réunion.
The above is an excerpt from a paper. It uses pdm in the same fashion.
It's fairly common in english that when referring to the same word repeatedly in a article, to shorten the word to a few letters. In this case each of the pdm is also referred to by the year the disease occurred or spread.
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