30 Sep 1864 Staff Assistant Surgeon.
26 May 1865 Assistant Surgeon 24th (2nd Warwickshire) Regiment of Foot.
Malta 13 Oct 1866 Arrived from England.
Malta 1867 On regimental duties.
Malta 4 May 1868 To England on private leave.
Malta 25 Nov 1868 Returned to Malta.
Malta 1869 On regimental duties.
Malta 17 June 1870 To England on leave.
Malta 2 Sep 1870 Returned to Malta.
Malta 25 Mar 1871 Resigned.
Feb 1872 Published On the origin of Rheumatic Orchitis, in which Duffey remarked on the frequency of the occurrence of rheumatic affections as a sequelae of the fevers seen in Malta, which had been repeatedly noticed by the medical officers of the army and navy serving on that station.
Duffey observed that in Malta there were two main forms of fevers, ephemeral fever and continued fever. Ephemeral fever, or febricula, was common during the summer and was attributable to climate; its usual duration was three days but occasionally the pyrexia was prolonged to a week (ephemera protracta), and succeeded by considerable debility. Fevers of the continued type, were described by different observers under a number of names such as: gastric remittent, bilious fever, Maltese fever, common continued fever, long fever, gastric fever, typhoid fever. Duffey after five years in Malta believed them all to be varieties of enteric fever.