All four deaths occurred during or after treatment with intravenous steroids. In one of the patients with relapsed disease, Azathioprine was added. Conclusion: Interstitial pneumonitis is a rare, but life-threatening side effect that should be considered in the differential diagnosis of patients INK 128 nmr presenting with respiratory symptoms during or after Interferon-based therapy. There is lack of data to guide treatment and current practice is to cease the drug and commence high dose steroids, either in oral or intravenous form. Pre-treatment respiratory

function tests and CT scan with mid-treatment follow-up should be considered in all patients on treatment and the early withdrawal of treatment is advocated in patients with rapid clinical decline. A-J GREENUP,1 PK TAN,1 V NGUYEN,1 A GLASS,1 H LORD,1 U CHATTERJEE,2 S DAVISON,1 L SMITH,1 A AYRES,2 S HOLDAWAY,3 D SAMARASINGHE,3 S LOCARNINI,4 M LEVY1,2 1Gastroenterology, Liverpool Hospital, Sydney, 2University of New South Wales, Sydney, 3Gastroenterology, Westmead Hospital, Sydney, NSW, 4Victorian

Infectious Diseases Reference Laboratory, Melbourne, VIC, Australia Background and Aims: Oral antiviral use in pregnancy reduces perinatal transmission of Hepatitis B Virus(HBV) in mothers with high viral load. We have previously reported that lamivudine has lower potency and emergence of resistance even after buy BEZ235 short term therapy. Tenofovir may be more favourable, though data regarding use for HBV in pregnancy is limited. Concerns about tenofovir include impact on infant growth parameters

from animal studies. Aims of this study were to examine efficacy of tenofovir in reducing HBV maternal viral load compared to lamivudine, the effectiveness of tenofovir in reducing HBV perinatal transmission and maternal and fetal safety of tenofovir. medchemexpress Methods: In this multi-centre, prospective real life study, pregnant women with high viral load (>7 log IU/ml) were offered tenofovir, commencing at 32 weeks gestation. Virological responses, safety in pregnancy and neonatal data were collected. Perinatal transmission was assessed at 9 months of age. Data from 60 women commencing tenofovir was compared to an historical cohort of lamivudine treated (21 women) and untreated (9 women, including four in current study) mothers. Results: Median baseline viral load was 8.1 log IU/mL (+/− 0.23). 18 women had prior antiviral therapy (10 during prior pregnancies; 8 short duration therapy). Median baseline ALT was 27 U/L (range 6–517). Four developed marked gastrointestinal intolerance within one week and were switched to lamivudine. Median duration of treatment prior to birth was 57 days. Median birth viral load (tested in 54 women) was 4.56 log IU/mL (+/− 0.31), a 3.6 log IU/mL drop. This was a one log greater reduction than lamivudine. Viral load remained >7 log IU/mL at birth in two pregnancies, despite 3 log viral load reduction.