Asgeir Johannessen

• Johannessen, Asgeir; Mekasha, Bitsatab; Desalegn, Hailemichael; Aberra, Hanna; Stene-Johansen, Kathrine & Berhe, Nega (2021). Mother-to-Child Transmission of Hepatitis B Virus in Ethiopia. Vaccines.  ISSN 2076-393X.  9(5) . doi: 10.3390/vaccines9050430 Show summary

  High viral load and positive hepatitis B e-antigen (HBeAg) results are risk factors for mother-to-child transmission (MTCT) of hepatitis B virus (HBV). In sub-Saharan Africa, little is known about the distribution of these risk factors, as well as early childhood HBV transmission. In this study, Ethiopian women aged 18-45 years with chronic hepatitis B were assessed for the presence of HBeAg and high viral load. Their children below 4 years of age were invited for assessment of viral markers, defining active HBV infection as a positive hepatitis B s-antigen (HBsAg) and/or detectable HBV DNA. In total, 61 of 428 HBV-infected women (14.3%) had a positive HBeAg result and/or a high viral load. Of note, 26 of 49 women (53.1%) with viral load above 200,000 IU/mL were HBeAg negative. Among 89 children born of HBV-infected mothers (median age 20 months), 9 (10.1%) had evidence of active HBV infection. In conclusion, one in seven women with chronic hepatitis B had risk factors for MTCT, and HBeAg was a poor predictor of high viral load. One in ten children born of HBV-infected women acquired HBV-infection despite completing their scheduled HBV vaccination at 6, 10 and 14 weeks of age.

• Desalegn, Hailemichael; Chanie, Yemisrach; Shume, Paulos; Delil, Miftah; Gupta, Neil & Johannessen, Asgeir (2020). Assessment of Noninvasive Markers of Liver Fibrosis in Patients With Chronic Hepatitis C in Ethiopia. Clinical Liver Disease (CLD).  ISSN 2046-2484.  16(4), s 168- 172 . doi: 10.1002/cld.1040
• Orlien, Stian; Ahmed, Tekabe Abdosh; Ismael, Nejib Yusuf; Berhe, Nega; Kran, Anne-Marte Bakken; Gundersen, Svein Gunnar & Johannessen, Asgeir (2020). Field performance of HBsAg rapid diagnostic tests in rural Ethiopia. Journal of Virological Methods.  ISSN 0166-0934.  289 . doi: 10.1016/j.jviromet.2020.114061 Show summary

  Point-of-care rapid diagnostic tests (POC-RDTs) are widely used to screen and diagnose hepatitis B virus (HBV) infection and are often the only available diagnostic tools in resource-limited settings. The aim of this study was to evaluate the validity of three hepatitis B surface antigen (HBsAg) POC-RDTs (Healgen®, Advanced Quality™ and Determine™) in an area with high prevalence of HBV in eastern Ethiopia. Results were compared with a commercial enzyme linked immunosorbent assay (ELISA) as gold standard. Quantification of HBsAg was performed in false negative samples. A total of 511 subjects were screened, of whom 81 (15.9%) were HBsAg-positive with the gold standard. All three POC-RDTs were positive in 65 of the 81 positive samples, yielding a sensitivity (95% confidence interval) of 80.2% (70.3-87.5) and a specificity of 99.8% (98.7-100 for Healgen® and Determine™; 98.6-100 for Advanced Quality™). False negatives were observed in 16 patients associated with low levels of HBsAg (median 1.5 IU/mL). All three POC-RDTs had reasonably high sensitivity and excellent specificity, but false negative results were observed in patients with low titres of HBsAg. Thus, these POC-RDTs might be useful to identify patients in need of HBV treatment, but cannot be recommended as blood donor screening tests.

• Woldemedihn, Gezahegn Mekonnen; Rueegg, Corina Silvia; Desalegn, Hailemichael; Aberra, Hanna; Berhe, Nega & Johannessen, Asgeir (2020). Validity of a point-of-care viral load test for hepatitis B in a low-income setting. Journal of Virological Methods.  ISSN 0166-0934.  289 . doi: 10.1016/j.jviromet.2020.114057 Show summary

  The recent launch of the first point-of-care Xpert® hepatitis B virus (HBV) viral load kit from Cepheid could help to scale up treatment for chronic hepatitis B (CHB) in resource-limited settings. This study aimed to assess the performance of the Xpert kit under field conditions in Ethiopia. One-hundred-and-thirty CHB patients with viral loads ranging from <1 log10 to>7 log10 IU/mL were randomly sampled. The viral load was assessed with both the Xpert and the gold standard Abbott RealTime HBV Viral Load assay in each patient. There was a high correlation between the viral loads assessed by Xpert and Abbott (r = 0.948, p < 0.001). The Bland-Altman plot showed a small bias between the two assays, with an on average 0.23 log10 IU/mL higher viral load result of the Xpert kit; 4 samples differed by>1 log10 IU/mL. Using the treatment threshold of 2000 IU/mL in both tests, Xpert had a sensitivity of 94 %, specificity of 71 %, positive predictive value of 70 %, and negative predictive value of 95 %. In conclusion, the Xpert kit demonstrated good validity for the measurement of HBV viral load in a real-life setting.

• Aberra, Hanna; Desalegn, Hailemichael; Berhe, Nega; Mekasha, Bitsatab; Medhin, Girmay; Gundersen, Svein Gunnar & Johannessen, Asgeir (2019). The WHO guidelines for chronic hepatitis B fail to detect half of the patients in need of treatment in Ethiopia. Journal of Hepatology.  ISSN 0168-8278.  70(6), s 1065- 1071 . doi: 10.1016/j.jhep.2019.01.037
• Al-Shudifat, Abdel-Ellah; Azab, Mohammed; Johannessen, Asgeir; Agraib, Lana & Tayyem, Reema (2019). Is the intake of antioxidants associated with risk of coronary artery disease? A Jordanian case-control study. Topics in Clinical Nutrition.  ISSN 0883-5691.  34(4), s 259- 268 . doi: 10.1097/TIN.0000000000000185 Show summary

  This study aimed to determine whether the intake of antioxidants was a risk factor for developing coronary artery disease. A total of 399 participants who underwent coronary angiography were included in the study, and patients with coronary artery disease (cases) were compared with patients with a normal coronary angiography (controls). Antioxidant consumption was higher in the control group than in the cases. Specifically, the controls had a higher consumption of foods rich in lutein, zeaxanthin, beta-carotene, and lycopene, but the difference did not reach statistical significance. The findings of the study suggest a possible beneficial association between coronary artery disease and the intake of dietary antioxidants

• Desalegn, Hailemichael; Aberra, Hanna; Berhe, Nega; Medhin, Girmay; Mekasha, Bitsatab; Gundersen, Svein Gunnar & Johannessen, Asgeir (2019). Predictors of mortality in patients under treatment for chronic hepatitis B in Ethiopia: a prospective cohort study. BMC Gastroenterology.  ISSN 1471-230X.  19(74) . doi: 10.1186/s12876-019-0993-1 Full text in Research Archive. Show summary

  Background Antiviral treatment for chronic hepatitis B (CHB) is largely unavailable in sub-Saharan Africa; hence, little is known about the prognosis after initiating treatment in African CHB patients. In this study we aimed to assess predictors of mortality in one of the largest CHB cohorts in sub-Saharan Africa. Methods Two-hundred-and-seventy-six CHB patients who started treatment with tenofovir disoproxil fumarate at a public hospital in Ethiopia between March 18, 2015, and August 1, 2017, were included in this analysis. Patients were followed up until October 1, 2017, and deaths were ascertained through hospital records and telephone interview with relatives. Decompensated cirrhosis was defined as current or past evidence of ascites, either by clinical examination or by ultrasonography. Cox proportional hazard models were used to identify independent predictors of mortality. Results Thirty-five patients (12.7%) died during follow-up, 33 of whom had decompensated cirrhosis at recruitment. The median duration from start of treatment to death was 110 days (interquartile range 26–276). The estimated survival was 90.3, 88.2 and 86.3% at 6, 12 and 24 months of follow-up, respectively. Independent predictors of mortality were decompensated cirrhosis (adjusted hazard ratio [AHR] 23.68; 95% CI 3.23–173.48; p = 0.002), body mass index < 18.5 kg/m2 (AHR 3.65; 95% CI 1.73–7.72; p = 0.001) and older age (per 1-year increment; AHR 1.06; 95% CI 1.02–1.10; p = 0.007). Conclusions Decompensated cirrhosis, low body mass index and older age were independent predictors of mortality. Improved access to antiviral treatment and earlier initiation of therapy could improve the survival of African CHB patients.

• Aberra, Hanna; Gordien, Emmanuel; Desalegn, Hailemichael; Berhe, Nega; Medhin, Girmay; Mekasha, Bitsatab; Gundersen, Svein Gunnar; Gerber, Athenaïs; Stene-Johansen, Kathrine; Øverbø, Joakim & Johannessen, Asgeir (2018). Hepatitis delta virus infection in a large cohort of chronic hepatitis B patients in Ethiopia. Liver international (Print).  ISSN 1478-3223.  38(6), s 1000- 1009 . doi: 10.1111/liv.13607
• Al-Shudifat, Abdel-Ellah; Azab, Mohammed; Johannessen, Asgeir; Al-Shdaifat, Amjad; Agraib, Lana & Tayyem, Reema (2018). Elevated fasting blood glucose, but not obesity, is associated with coronary artery disease in patients undergoing elective coronary angiography in a referral hospital in Jordan. Annals of Saudi Medicine.  ISSN 0256-4947.  38(2), s 111- 117 . doi: 10.5144/0256-4947.2018.111
• Azab, Mohammed; Al-Shudifat, Abdel-Ellah; Johannessen, Asgeir; Al-Shdaifat, Amjad; Agraib, Lana & Tayyem, Reema (2018). Are Risk Factors for Coronary Artery Disease Different in Persons with and Without Obesity?. Metabolic Syndrome and Related Disorders.  ISSN 1540-4196.  16(8), s 440- 445 . doi: 10.1089/met.2017.0152
• Desalegn, Hailemichael; Aberra, Hanna; Berhe, Nega; Mekasha, Bitsatab; Stene-Johansen, Kathrine; Krarup, Henrik; Pereira, Andrè Puntervold; Gundersen, Svein Gunnar & Johannessen, Asgeir (2018). Treatment of chronic hepatitis B in sub-Saharan Africa: 1-year results of a pilot program in Ethiopia. BMC Medicine.  ISSN 1741-7015.  16 . doi: 10.1186/s12916-018-1229-x Full text in Research Archive.
• Orlien, Stian Magnus Staurung; Ismael, Nejib Yusuf; Ahmed, Tekabe Abdosh; Berhe, Nega; Lauritzen, Trine; Roald, Borghild; Goldin, Robert David; Stene-Johansen, Kathrine; Dyrhol-Riise, Anne Ma; Gundersen, Svein Gunnar; Morgan, Marsha Yvonne & Johannessen, Asgeir (2018). Unexplained chronic liver disease in Ethiopia: a cross-sectional study. BMC Gastroenterology.  ISSN 1471-230X.  18(1) . doi: 10.1186/s12876-018-0755-5 Full text in Research Archive.
• Orlien, Stian; Ahmed, Tekabe Abdosh; Ismael, Nejib Yusuf; Berhe, Nega; Lauritzen, Trine; Gundersen, Svein Gunnar & Johannessen, Asgeir (2018). High Seroprevalence of Autoantibodies Typical of Autoimmune Liver Disease in Eastern Ethiopia: Is Chewing of Khat (Catha edulis) a Triggering Factor?. Canadian journal of gastroenterology & hepatology.  ISSN 2291-2789.  s 1- 10 . doi: 10.1155/2018/4980597
• Orlien, Stian; Sandven, Irene; Berhe, Nega; Ismael, Nejib Yusuf; Ahmed, Tekabe Abdosh; Stene-Johansen, Kathrine; Gundersen, Svein Gunnar; Morgan, Marsha Yvonne & Johannessen, Asgeir (2018). Khat chewing increases the risk for developing chronic liver disease: A hospital-based case-control study. Hepatology.  ISSN 0270-9139.  68(1), s 248- 257 . doi: 10.1002/hep.29809
• Aberra, Hanna; Desalegn, Hailemichael; Berhe, Nega; Medhin, Girmay; Stene-Johansen, Kathrine; Gundersen, Svein Gunnar & Johannessen, Asgeir (2017). Early experiences from one of the first treatment programs for chronic hepatitis B in sub-Saharan Africa. BMC Infectious Diseases.  ISSN 1471-2334.  17(1) . doi: 10.1186/s12879-017-2549-8 Full text in Research Archive.
• Al-Shudifat, Abdel-Ellah; Al-Shdaifat, Amjad; Al-Abdouh, Ahmad Ali; Aburoman, Mohammad Ibrahim; Otoum, Sara Mohammad; Sweedan, Amro Ghaleb; Khrais, Ibrahim; Abdel-Hafez, Ibrahim Hisham & Johannessen, Asgeir (2017). Diabetes Risk Score in a Young Student Population in Jordan: A Cross-Sectional Study. Journal of Diabetes Research.  ISSN 2314-6745.  2017 . doi: 10.1155/2017/8290710
• Al-Shudifat, Abdel-Ellah; Johannessen, Asgeir; Azab, Mohammed; Al-Shdaifat, Amjad; AbuMweis, Suhad Sameer; Agraib, Lana & Tayyem, Reema (2017). Risk factors for coronary artery disease in patients undergoing elective coronary angiography in Jordan. BMC Cardiovascular Disorders.  ISSN 1471-2261.  17(1) . doi: 10.1186/s12872-017-0620-4
• Desalegn, Hailemichael; Aberra, Hanna; Berhe, Nega; Gundersen, Svein Gunnar & Johannessen, Asgeir (2017). Are non-invasive fibrosis markers for chronic hepatitis B reliable in sub-Saharan Africa?. Liver international (Print).  ISSN 1478-3223.  37(10), s 1461- 1467 . doi: 10.1111/liv.13393
• Tayyem, Reema; Al-Shudifat, Abdel-Ellah; Johannessen, Asgeir; Bawadi, H A; AbuMweis, Suhad Sameer; Agraib, Lana; Allhedan, S S; Haj-Husein, I & Azab, Mohammed (2017). Dietary patterns and the risk of coronary heart disease among Jordanians: A case–control study. NMCD. Nutrition Metabolism and Cardiovascular Diseases.  ISSN 0939-4753.  28(3), s 262- 269 . doi: 10.1016/j.numecd.2017.10.026
• Stene-Johansen, Kathrine; Yaqoob, Nadeem; Øverbø, Joakim; Aberra, Hanna; Desalegn, Hailemichael; Berhe, Nega & Johannessen, Asgeir (2016). Dry blood spots a reliable method for measurement of Hepatitis B viral load in resource-limited settings. PLOS ONE.  ISSN 1932-6203.  11(11) . doi: 10.1371/journal.pone.0166201 Full text in Research Archive.
• Johannessen, Asgeir (2015). Where we are with point-of-care testing. Journal of Viral Hepatitis.  ISSN 1352-0504.  22(4), s 362- 365 . doi: 10.1111/jvh.12385
• Pettersen, Pernille; Brox, Ida Katarina; Naman, Ezra; Bruun, Johan N; Dyrhol-Riise, Anne Ma; Trøseid, Marius & Johannessen, Asgeir (2015). Antiretroviral treatment failure predicts mortality in rural Tanzania. International Journal of STD and AIDS.  ISSN 0956-4624.  26(9), s 633- 639 . doi: 10.1177/0956462414548460
• Brantsæter, Arne; Johannessen, Asgeir; Holberg-Petersen, Mona; Sandvik, Leiv; Naman, Ezra; Kivuyo, Sokoine; Rollag, Halvor; Bruun, Johan N & Kvale, Dag (2012). Cytomegalovirus viremia in dried blood spots is associated with an increased risk of death in HIV-infected patients: a cohort study from rural Tanzania. International Journal of Infectious Diseases.  ISSN 1201-9712.  16(12), s E879- E885 . doi: 10.1016/j.ijid.2012.08.003
• Johannessen, Asgeir; Garrido, Carolina; Zahonero, Natalia; Naman, Ezra & de Mendoza, Carmen (2011). HIV-1 drug resistance testing from dried blood spots collected in rural Tanzania using the ViroSeq HIV-1 Genotyping System. Journal of Antimicrobial Chemotherapy.  ISSN 0305-7453.  66(2), s 260- 264 . doi: 10.1093/jac/dkq433
• Johannessen, Asgeir; Naman, Ezra; Gundersen, Svein Gunnar & Bruun, Johan Nikolai (2011). Antiretroviral treatment reverses HIV-associated anemia in rural Tanzania. BMC Infectious Diseases.  ISSN 1471-2334.  11 . doi: 10.1186/1471-2334-11-190 Full text in Research Archive.
• Kivuyo, Sokoine; Johannessen, Asgeir; Trøseid, Marius; Kasubi, Mabula Joseph; Gundersen, Svein Gunnar; Naman, Ezra; Mushi, Daniel E.; Ngowi, Bernard James; Mfinanga, Sayoki Godfrey M. & Bruun, JN (2011). p24 antigen detection on dried blood spots is a feasible and reliable test for infant HIV infection in rural Tanzania. International Journal of STD and AIDS.  ISSN 0956-4624.  22(12), s 719- 721 . doi: 10.1258/ijsa.2009.009382
• Bratholm, Clara Sofie; Johannessen, Asgeir; Naman, Ezra; Gundersen, Svein Gunnar; Kivuyo, Sokoine; Holberg-Petersen, Mona; Ormaasen, Vidar & Bruun, Johan N (2010). Drug resistance is widespread among children who receive long-term antiretroviral treatment at a rural Tanzanian hospital. Journal of Antimicrobial Chemotherapy.  ISSN 0305-7453.  65(9), s 1996- 2000 . doi: 10.1093/jac/dkq234 Full text in Research Archive.
• Johannessen, Asgeir (2010). Dried blood spots in HIV monitoring: applications in resource-limited settings. Bioanalysis.  ISSN 1757-6180.  2(11), s 1893- 1908 . doi: 10.4155/BIO.10.120
• Johannessen, Asgeir; Holberg-Petersen, Mona; Løvgården, Gunilla; Naman, Ezra; Ormaasen, Vidar; Matee, Mecky I; Gundersen, Svein Gunnar & Bruun, Johan N (2010). HIV type-1 drug resistance testing on dried blood spots is feasible and reliable in patients who fail antiretroviral therapy in rural Tanzania. Antiviral Therapy.  ISSN 1359-6535.  15(7), s 1003- 1009 . doi: 10.3851/IMP1660 Show summary

  Background: HIV type-1 (HIV-1) drug resistance testing is rarely available in resource-limited settings because of high costs and stringent requirements for storage and transport of plasma. Dried blood spots (DBS) can be a convenient alternative to plasma, but the use of DBS needs validation under field conditions. We assessed the performance of DBS in genotypic resistance testing of patients who failed first-line antiretroviral therapy (ART) in rural Tanzania. Methods: A total of 36 ART-experienced patients with viral loads >1,000 copies/ml (median 15,180 copies/ml [range 1,350?3,683,000]) and with various HIV-1 subtypes were selected for resistance testing. DBS were stored with desiccant at ambient temperature for a median of 29 days (range 8?89). Samples were amplified using an in-house reverse transcriptase-nested PCR method and sequenced using the ViroSeq? assay (Abbott Molecular, Des Plaines, IL, USA). DBS-derived genotypes were compared with genotypes from plasma. Results: Overall, 34 of 36 (94%) DBS specimens were successfully genotyped. In the protease region, of 142 polymorphisms found in plasma, 132 (93%) were also detected in DBS. In the reverse transcriptase region, of 57 clinically relevant mutations present in plasma, 51 (89%) were also detected in DBS. A total of 30 of 34 (88%) patients had identical resistance profiles to antiretroviral drugs in plasma and DBS. Conclusions: Genotyping was successful in the vast majority of DBS specimens stored at ambient temperature for up to 3 months, and there was high concordance between mutations found in DBS and plasma. Our study suggests that DBS can be a feasible and reliable tool to monitor HIV-1 drug resistance in patients on ART in resource-limited settings.

• Johannessen, Asgeir; Garrido, Carolina; Zahonero, Natalia; Sandvik, Leiv; Naman, Ezra; Kivuyo, Sokoine; Kasubi, Mabula J.; Gundersen, Svein Gunnar; Bruun, Johan N & de Mendoza, Carmen (2009). Dried Blood Spots Perform Well in Viral Load Monitoring of Patients Who Receive Antiretroviral Treatment in Rural Tanzania. Clinical Infectious Diseases.  ISSN 1058-4838.  49(6), s 976- 981 . doi: 10.1086/605502 Show summary

  Conclusions. DBS, in combination with the NucliSENS EasyQ HIV-1 v1.2 asay, performed well in monitoring HIV viral loads in patients who received ART in rural Tanzania, although the sensitivity was reduced when viral burden was low. The use of DBS can simplify virological monitoring in resource-limited settings.

• Johannessen, Asgeir; Garrido, Carolina; Zahonero, Natalia; Sandvik, Leiv; Naman, Ezra; Kivuyo, Sokoine; Kasubi, Mabula; Gundersen, Svein G; Bruun, Johan N & Mendoza, Carmen de (2009). Dried Blood Spots perform well in viral load monitoring of patients who receive antiretroviral treatment in rural Tanzania. Clinical Infectious Diseases.  ISSN 1058-4838.  49, s 976- 981 . doi: 10.1086/605502
• Johannessen, Asgeir; Naman, Ezra; Kivuyo, Sokoine; Kasubi, Mabula J.; Holberg-Petersen, Mona; Matee, M.; Gundersen, Svein Gunnar; Gundersen, Svein Gunnar & Bruun, Johan N (2009). Virological efficacy and emergence of drug resistance in adults on antiretroviral treatment in rural Tanzania. BMC Infectious Diseases.  ISSN 1471-2334.  9, s 8 Show summary

  Conclusion: Virological suppression rates were good up to 4 years after initiating ART in a rural Tanzanian hospital. However, drug resistance increased with time, and dual-class resistance was common, raising concerns about exhaustion of future antiretroviral drug options. This study might provide a useful forecast of drug resistance and demand for second-line antiretroviral drugs in rural Africa in the coming years.

• Johannessen, Asgeir; Naman, Ezra; Kivuyo, Sokoine; Kasubi, Mabula; Holberg-Petersen, Mona; Matee, Mecky I; Gundersen, Svein Gunnar & Bruun, Johan N (2009). Virological efficacy and emergence of drug resistance in adults on antiretroviral treatment in rural Tanzania. BMC Infectious Diseases.  ISSN 1471-2334.  9, s 108 . doi: 10.1186/1471-2334-9-108
• Johannessen, Asgeir; Trøseid, Marius & Calmy, Alexandra (2009). Dried blood spots can expand access to virological monitoring of HIV treatment in resource-limited settings. Journal of Antimicrobial Chemotherapy.  ISSN 0305-7453.  64(6), s 1126- 1129 . doi: 10.1093/jac/dkp353
• Johannessen, Asgeir; Naman, Ezra; Ngowi, Bernard; Sandvik, Leiv; Matee, Mecky I; Aglen, Henry; Gundersen, Svein G & Bruun, Johan N (2008). Predictors of mortality in HIV-infected patients starting antiretroviral therapy in a rural hospital in Tanzania. BMC Infectious Diseases.  ISSN 1471-2334.  (8), s 52
• Johannessen, Asgeir; Naman, Ezra; Ngowi, Bernhard J; Sandvik, Leif; Matee, M.; Aglen, Henry E; Gundersen, Svein Gunnar & Bruun, Johan N (2008). Predictors of mortality in HIV-infected patients starting antiretroviral therapy in a rural hospital in Tanzania. BMC Infectious Diseases.  ISSN 1471-2334.  8, s 10 Show summary

  Conclusion: Mortality was found to be high, with the majority of deaths occurring within 3 months of starting ART. Anemia, thrombocytopenia and severe malnutrition were strong independent predictors of mortality. A prognostic model based on hemoglobin level appears to be a useful tool for initial risk assessment in resource-limited settings.

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• Johannessen, Asgeir; Aberra, Hanna; Desalegn, Hailemichael; Gordien, Emmanuel & Berhe, Nega (2019). A novel score to select patients for treatment in chronic hepatitis B: Results from a large Ethiopian cohort.. Journal of Hepatology.  ISSN 0168-8278.  71(4), s 840- 841 . doi: 10.1016/j.jhep.2019.04.006
• Orlien, Stian; Berhe, Nega; Morgan, Marsha Yvonne & Johannessen, Asgeir (2019). Khat-related liver disease in sub-Saharan Africa: neglected, yet important. The Lancet Global Health.  ISSN 2572-116X.  7(3), s e310- e310 . doi: 10.1016/S2214-109X(18)30527-8
• Desalegn, Hailemichael & Johannessen, Asgeir (2017). Response to Non-invasive fibrosis markers for chronic hepatitis B in sub-Saharan Africa.. Liver international (Print).  ISSN 1478-3223.  37(11), s 1739- 1739 . doi: 10.1111/liv.13425
• Johannessen, Asgeir & Lemoine, Maud (2015). Is aspartate aminotransferase-to-platelet ratio index a reliable tool in human immunodeficiency virus patients in Africa?. Liver international (Print).  ISSN 1478-3223.  35(8), s 2059- 2059 . doi: 10.1111/liv.12793
• Johannessen, Asgeir (2011). Antiretroviral treatment of HIV/AIDS in rural Tanzania : long-term outcome and simplified monitoring tools. Series of dissertations submitted to the Faculty of Medicine, University of Oslo. 1123.
• Johannessen, Asgeir (2011). Are men the losers of the antiretroviral treatment scale-up?. AIDS (London).  ISSN 0269-9370.  25(9), s 1225- 1226 . doi: 10.1097/QAD.0b013e32834403b8
• Johannessen, Asgeir (2011). Drug resistance is widespread among children who receive long-term antiretroviral treatment at a rural Tanzanian hospital-author's response. Journal of Antimicrobial Chemotherapy.  ISSN 0305-7453.  66(4), s 957- 958 . doi: 10.1093/jac/dkr042
• Johannessen, Asgeir (2010). Quantification of HIV-1 RNA on dried blood spots. AIDS (London).  ISSN 0269-9370.  24(3), s 475- 476 . doi: 10.1097/QAD.0b013e3283365383
• Trøseid, Marius & Johannessen, Asgeir (2010). Et skritt i riktig retning. Tidsskrift for Den norske legeforening.  ISSN 0029-2001.  130(22), s 2223

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