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Background/introductionTwitter is a free, online social networking service through which users can read and send brief messages of up to 140-characters called “Tweets.” BASHH (@BASHH_UK) currently has 3479 followers on Twitter. These include professionals working in sexual health, sexual health services with their own Twitter accounts and members of the public. Twitter disseminates messages instantly and can influence a wide audience. It can be used to keep health professionals and patients informed about relevant research and headline news. For example, recent Twitter themes have included discussions about PrEP and gonorrhoea resistance. Twitter is also used for sharing practical information such as conference deadlines.Aim(s)/objectivesTo evaluate the reach of BASHH on Twitter by reporting BASHH’s Twitter activity.MethodsUsing Twitter Analytics, data was obtained on the number of Tweets and Tweet Impressions for each of the last 4 months. Tweet Impressions are counted as the number of times each Tweet is seen. The number of visits to BASHH’s Twitter profile, mentions by other Twitter users and number of new followers are also recorded. This is presented below:ResultsAbstract P211 Table 1BASHH on TwitterMonthTweetsTweet ImpressionsProfile VisitsMentionsNew followersNovember 201518192001122105120December 2015313660015488367January 201649455002398222120February 201633281002394125108Discussion/conclusionBASHH’s Twitter activity is reaching a large audience and increasing. All individuals working in sexual health and HIV should consider using Twitter to support wider engagement with their professional network.

Ottawa rule did not miss any important intracranial diagnosis in this cohort, including viral meningitis (n=6; 1.6%), subdural haematoma (n=3; 0.8%), intraparenchymal haemorrhage (n=5; 1.4%), arteriovenous malformation (n=2; 0.6%) and primary brain neoplasm (n=1; 0.3%). The scope of the Ottawa rule therefore may be wider than previously described and its clinical applicability may not be limited only to patients with a thunderclap headache. This study, however, is retrospective. These results should therefore be considered as hypothesis generating rather than confirmatory and would require validation within the context of a prospective study.The results of our study add to the growing body of evidence for the use of this tool and although it will not usurp the opinion of the clinician it may be helpful for risk stratification and to facilitate the discussion with radiological colleagues when requesting CT in patients with acute non-traumatic headache presenting to the emergency department. ■ As such, we would like to remind our colleagues to remember that the itchy (rash free) patient can be a classic presentation of iron deficiency (with or without anaemia). ■