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Even Fossum

@evenfossum

Senior Researcher at Norwegian Institute of Public Health with focus on respiratory viruses and immunity.

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25.12.2023
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Latest posts by Even Fossum @evenfossum

Early influenza virus characterisation and vaccine effectiveness in England in autumn 2025, a period dominated by influenza A(H3N2) subclade K Influenza A(H3N2) subclade K (J.2.4.1) has dominated the 2025/26 season start in England. Post-infection ferret antisera raised against northern hemisphere 2025/26 vaccine strains showed reduced reactivity to subclade K viruses in England, aligning with World Health Organization reports. Nevertheless, early post-vaccination, vaccine effectiveness against influenza-related emergency department attendances and hospital admissions remained within typical ranges, at 72–75% in children and adolescents (< 18 years) and 32–39% in adults. Hence, vaccination remains effective against clinical disease caused by influenza A(H3N2) viruses.

www.eurosurveillance.org/content/10.2...

20.11.2025 17:36 👍 3 🔁 2 💬 0 📌 0
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Opinion | Bernie Sanders: Kennedy Must Resign

Good article from Sen Sanders.

However, why must he resign - why cannot he be removed?

www.nytimes.com/2025/08/30/o...

30.08.2025 15:06 👍 2 🔁 1 💬 0 📌 0
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Postdoctoral Research Fellowship in Chromatin Biology and Cancer Epigenetics (283381) | University of Oslo Job title: Postdoctoral Research Fellowship in Chromatin Biology and Cancer Epigenetics (283381), Employer: University of Oslo, Deadline: Wednesday, August 20, 2025

We are hiring! A 3-year postdoc in #Chromatin #Cancer #Epigenetics at University of Oslo, Norway and co-supervised by @amathelier.bsky.social You will be part of @cancelluio.bosky.social. We focus on #Sarcoma #Epigenome #CRISPR and Drug screen studies. Find out more and apply here: shorturl.at/DtLHM

12.08.2025 09:08 👍 16 🔁 11 💬 2 📌 1

My slight problem with «Infection pause» is that the term does not cover vaccine induced immunity. The absence of the pathogen is not really a problem if immunity can be obtained through vaccines.

01.08.2025 13:32 👍 1 🔁 0 💬 3 📌 0

I think the term «immunity gap» works better when referring to an increasing number of new naive individuals, but «immune shortage» works well with waning responsen and novel immune evasive variants.

01.08.2025 09:25 👍 3 🔁 0 💬 1 📌 0
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Hvordan oppsto pandemien? Ingen er tjent med en overdramatisering og spekulativ fremstilling. Ingen er tjent med en overdramatisering og spekulativ fremstilling av hvordan pandemien kan ha blitt til.

Vi har skrevet kronikk i @aftenposten.no om det vi mener er en overdramatisert fremstilling av opphavet til SARS-CoV-2. Vi utelukker ikke lab-lekasje, men fagfellevurdert litteratur peker i overveldende grad mot zoonose. @karobra.bsky.social www.aftenposten.no/meninger/kro...

10.06.2025 10:09 👍 5 🔁 0 💬 0 📌 0
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Low Levels of Neutralizing Antibodies Against SARS‐CoV‐2 KP.3.1.1 and XEC in Serum From Seniors in May 2024 New immune evasive variants of SARS-CoV-2 may increase infections and hospitalizations in risk groups, such as the elderly. In this study, we evaluated neutralizing antibodies against KP.3.1.1 and XE....

Paper on immunity in elderly against XEC and KP.3.1.1 now published in Influenza and Other Respiratory Viruses.

onlinelibrary.wiley.com/doi/10.1111/...

15.05.2025 21:28 👍 2 🔁 0 💬 0 📌 0

Må vel nesten tilbake til Roadster for å kunne si at man kjøpte bilen før det bikket over for Elon…

23.03.2025 20:53 👍 2 🔁 0 💬 1 📌 0
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Researcher in Computational Biology and Cancer Epigenetics&nbsp; (275425) | University of Oslo Job title: Researcher in Computational Biology and Cancer Epigenetics&nbsp; (275425), Employer: University of Oslo, Deadline: Monday, March 31, 2025

We are hiring! A 3-year Researcher in #Computational #Biology and #Cancer #Epigenetics in University of Oslo, Norway and co-supervised by @amathelier.bsky.social . You will be part of @cancelluio.bsky.social. We focus on #Sarcoma. Find out more and apply here: shorturl.at/gM1CG

10.03.2025 22:14 👍 17 🔁 15 💬 0 📌 2
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Detection of low pre-existing humoral immunity against influenza virus H5N1 clade 2.3.4.4b in unexposed individuals The repeated spill-over of Influenza A virus H5N1 clade 2.3.4.4b from cattle to humans highlights the risk of a human H5N1 pandemic. Given the impact of pre-existing immunity on the course and severity of viral infections, we assessed in detail the humoral immunity against the H5N1 A/Texas/37/2024 isolate in H5N1-naïve individuals. To this end, we performed complementary binding and neutralization assays on 66 subjects and ranked activities among a panel of 76 influenza A virus isolates. We detected low but distinct cross-neutralizing titers against A/Texas/37/2024 with a 3.9 to 15.6-fold reduction compared to selected H1N1 or H3N2 strains. Moreover, by cloning and evaluating 136 monoclonal antibodies from single memory B cells, we identified potent A/Texas/37/2024-neutralizing monoclonal antibodies in five out of six investigated individuals. These antibodies predominantly utilize VH1-69 gene segments, cross-neutralize H1, and compete with antibodies targeting the HA stem. Our findings demonstrate partial pre-existing humoral immunity to A/Texas/37/2024 in H5N1-naïve individuals. ### Competing Interest Statement DR, MM, CK, FK, and ML are members of the non-profit Center for Predictive Analysis of Viral Evolution (Previr). LG, HG, CK and FK are inventors on patent applications on virus neutralizing antibodies filed by the University of Cologne and have received payments from the University of Cologne for licensed patents.

Detection of low pre-existing humoral immunity against influenza virus H5N1 clade 2.3.4.4b in unexposed individuals

Pre-print assessing the humoral immunity against the H5N1 A/Texas/37/2024 isolate in H5N1-naïve individuals.

www.biorxiv.org/cont...
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29.01.2025 12:31 👍 30 🔁 14 💬 2 📌 1
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Dagens propaganda 👉🏻 www.instagram.com/p/DE96mWksBd...

18.01.2025 12:47 👍 23 🔁 3 💬 0 📌 0
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Vi er ute med et notat om utsikter for luftveisviurs-sesongen 2024-25 i Norge.

www.fhi.no/contentasset...

20.12.2024 08:00 👍 2 🔁 0 💬 0 📌 0

New risk assessment of the XEC variant by @who.int. www.who.int/docs/default...

12.12.2024 12:26 👍 1 🔁 0 💬 0 📌 0
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Kronikk: Trump og Kennedy er livsfarlige menn En vaksineskeptiker kan bli helseminister. Nobelpris-vinnere slår alarm, skriver Per Helge Måseide.

En barnelege er mest lest på Aftenposten i dag. Med god grunn, kan man trygt si www.aftenposten.no/meninger/kro...

11.12.2024 15:07 👍 38 🔁 6 💬 3 📌 0
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The final report from the COVID Sub Committee is released and it is as expected given that the origin "has been contorted by politics, while scientific discourse has been abandoned in pursuit of a preferred, coordinated narrative", as I stated in my written testimony.

BUT, there's a bombshell.. 🧵👇

03.12.2024 02:18 👍 200 🔁 68 💬 12 📌 16
Eldre bør ta oppfriskningsdose med koronavaksine Eldre har lavt nivå av beskyttende antistoffer mot de nyeste varianter av SARS-CoV-2 viruset viser en ny studie fra Folkehelseinstituttet. Derfor bør eldre ta oppfriskningsdose med koronavaksine.

Eldre bør ta oppfriskningsdose med koronavaksine www.fhi.no/nyheter/2024...

22.11.2024 16:29 👍 3 🔁 1 💬 0 📌 0
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Robust antiviral humoral immunity induced by JN.1 monovalent mRNA vaccines against a broad range of SARS-CoV-2 Omicron subvariants including JN.1, KP.3.1.1 and XEC As of November 2024, SARS-CoV-2 Omicron JN.1 subvariants, such as KP.2 (JN.1.11.1.2), KP.3 (JN.1.11.1.3), KP.3.1.1 (JN.1.11.1.3.1.1), and XEC, a recombinant lineage between KS.1.1 (JN.13.1.1.1) and KP.3.3 (JN.1.11.1.3.3), have been circulating in several countries. To control the infection with SARS-CoV-2 Omicron JN.1 subvariants, JN.1 monovalent mRNA vaccines have been developed. Some previous reports showed that the JN.1 monovalent mRNA vaccine of Pfizer/BioNTech (US/Germany) increased antiviral humoral immunity against JN.1 subvariants and XEC. However, the efficacy of other available JN.1 monovalent mRNA vaccines (e.g., Daiichi-Sankyo, Japan) remains unassessed. To validate the antiviral efficacy induced by JN.1 mRNA vaccines, sera were collected from individuals vaccinated with Pfizer/BioNTech JN.1 mRNA vaccine (N=15) or Daiichi-Sankyo JN.1 mRNA vaccine (N=19) before and 3-4 weeks after vaccination. We then performed a neutralization assay using these sera and pseudoviruses. Both Pfizer/BioNTech JN.1 vaccine (2.4- to 8.0-fold, P=0.0001) and Daiichi-Sankyo JN.1 vaccine (2.3- to 13-fold, P=0.0001) boosted antiviral humoral immunity against all variants tested with statistical significance. While the Pfizer/BioNTech mRNA vaccine encodes the full-length JN.1 spike (S), the Daiichi-Sankyo mRNA vaccine encodes the receptor-binding domain of JN.1 S. Our data suggest that the receptor-binding domain of JN.1 S can effectively induce antiviral humoral immunity against JN.1 subvariants and XEC comparable to the full-length JN.1 S. However, it should be considered that the sizes of our cohorts are relatively small (<20 donors per cohort), and donor characteristics, such as age, sex, underlying disease status, and previous SARS-CoV-2 infection, may critically affect the experimental results. Future investigations with larger cohorts will address this concern. When compared to vaccination with JN.1 mRNA vaccines, our previous investigations showed that the natural infection of JN.1 and KP.3.3 elicited poorer antiviral humoral immunity against JN.1 and its subvariants. Our results suggest that the JN.1 mRNA vaccination more robustly induces antiviral humoral immunity against recent JN.1 subvariants than the natural infection of JN.1 subvariants regardless of manufacturer. Moreover, as we reported last year, the humoral immunity induced by XBB.1.5 monovalent mRNA vaccine against XBB.1.5 was weaker than that against ancestral B.1.1. However, in the case of JN.1 monovalent mRNA vaccine, here we showed that the 50% neutralization titer against XBB.1.5 is greater than that against ancestral B.1.1. These observations imply that immune imprinting has shifted from that biased toward pre-Omicron to that biased toward Omicron, depending on the time and/or number of immune stimuli (e.g., infection and/or vaccination). ### Competing Interest Statement K.S. has consulting fees from Moderna Japan Co., Ltd. and Takeda Pharmaceutical Co. Ltd. and honoraria for lectures from Gilead Sciences, Inc., Moderna Japan Co., Ltd., and Shionogi & Co., Ltd. The other authors declare no competing interests. All authors have submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Conflicts that the editors consider relevant to the content of the manuscript have been disclosed.

Robust antiviral humoral immunity induced by JN.1 monovalent mRNA vaccines against a broad range of SARS-CoV-2 Omicron subvariants including JN.1, KP.3.1.1 and XEC

Several rounds of vaccines have resulted in robust immune memory.

www.biorxiv.org/cont...
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21.11.2024 11:40 👍 21 🔁 8 💬 1 📌 0
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Low levels of neutralizing antibodies against SARS-CoV-2 KP.3.1.1 and XEC in serum from seniors in May 2024

Increased vaccine efforts for the elderly are crucial.
https://buff.ly/4fwxa4Q

20.11.2024 04:20 👍 9 🔁 5 💬 0 📌 0
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Low level of neutralizing antibodies against KP.3.1.1 and XEC highlighting the importance of updated JN.1 or KP.2 based vaccines for this age group.

20.11.2024 08:46 👍 1 🔁 1 💬 0 📌 0
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Low levels of neutralizing antibodies against SARS-CoV-2 KP.3.1.1 and XEC in serum from seniors in May 2024 New immune evasive variants of SARS-CoV-2 may increase infections and hospitalizations in risk groups, such as the elderly. We evaluated neutralizing antibodies against recent variants KP.3.1.1 and XEC, that are either widely distributed or on the rise globally, in sera from a cohort of seniors aged 65+ years from May 2024. Neutralizing responses were low against both KP.3.1.1 and XEC in the seniors, suggesting that further efforts to increase vaccine uptake in seniors are warranted. ### Competing Interest Statement The authors have declared no competing interest.

We have evaluated neutralizing antibodies against recent SARS-CoV-2 strains in seniors aged 67- 82 years prior to rollout of updated vaccines in fall 2024. #SARS-CoV-2 #immunity www.biorxiv.org/content/10.1...

20.11.2024 08:46 👍 2 🔁 0 💬 1 📌 0

#influenza #SARS-CoV-2 #immunitygap

01.04.2024 08:44 👍 0 🔁 0 💬 0 📌 0

Our study on the development of immunity towards flu during the covid-19 pandemic is now published. In short, we observe the formation of an immunity gap in the youngest, while immunity remains stable in the other age groups. virologyj.biomedcentral.com/articles/10....

01.04.2024 08:42 👍 2 🔁 0 💬 2 📌 0