Nasal Vaccine to Prevent Covid-19 Passes First Tests

Scientists in Berlin have developed a live attenuated vaccine for the nose and recently published a study in "Nature Microbiology"

Joint press release by Freie Universität Berlin, Max Delbrück Center, and Charité - Universitätsmedizin Berlin Coronaviruses spread primarily through the air. When infected people speak, cough, sneeze, or laugh, they expel droplets of saliva containing the virus. Other people then breathe in these airborne pathogens and become infected themselves. A research team in Berlin decided to try to fight the virus that causes Covid-19 where it first takes hold: the mucous membranes of the nose, mouth, throat, and lungs. To do so, the scientists developed a live attenuated SARS-CoV-2 vaccine that is administered through the nose. In the latest issue of the journal Nature Microbiology, the interdisciplinary team describes how this live attenuated vaccine confers better immunity than vaccines injected into muscle.

Protection at the Site of Infection

Two nasal vaccination formulations were approved for use in India and China back in fall of last year. These contain modified adenoviruses - which typically cause respiratory or gastrointestinal illnesses - that are self-attenuating, meaning they either replicate poorly or stop replicating altogether, and therefore never trigger disease. Other live nasal vaccines are currently undergoing development and testing around the world.

The benefits of a nasal vaccine go far beyond just providing an alternative for people afraid of needles. When a vaccine is injected, it infers immunity primarily in the blood and throughout the entire body. However, this means that the immune system only detects and combats coronaviruses relatively late in an infection, as they enter the body via the mucous membranes of the upper respiratory tract. "It is here, therefore, that we need local immunity if we want to intercept a respiratory virus early on," explains co-author Dr. Jakob Trimpert, a veterinarian and research group leader at the Institute of Virology at Freie Universität Berlin. "Nasal vaccines are far more effective in this regard than injected vaccines, which fail or struggle to reach the mucous membranes," adds Dr. Emanuel Wyler, another co-author. He has been researching Covid-19 since the start of the pandemic as part of the RNA Biology and Posttranscriptional Regulation Lab, which is led by Professor Markus Landthaler at the Berlin Institute for Medical Systems Biology at the Max Delbrück Center (MDC-BIMSB).

In an ideal scenario, a live intranasal vaccine stimulates the formation of the antibody immunoglobulin A (IgA) directly on site, thus preventing infection from occurring in the first place. IgA is the most common immunoglobin in the mucous membranes of the airways. It is able to neutralize pathogens by binding to them and preventing them from infecting respiratory tract cells. At the same time, the vaccine stimulates systemic immune responses that help provide effective overall protection from infection. "Memory T cells that reside in lung tissue play a similarly useful role to antibodies in the mucosa," explains Dr. Geraldine Nouailles, an immunologist and research group leader at the Department of Pneumology, Respiratory Medicine, and Intensive Care Medicine at Charité. "These white blood cells remain in affected tissue long after an infection has passed and remember pathogens they have encountered before. Thanks to their location in the lungs, they can respond quickly to viruses that enter through the airways." The co-first author draws attention to one of the observations the team made during their study: "We were able to show that prior intranasal vaccination results in the increased reactivation of these local memory cells in the event of a subsequent SARS-CoV-2 infection. Needless to say, we were particularly pleased with this result."

Local Immunity Impedes Viral Infection

The scientists tested the efficacy of the newly developed intranasal Covid-19 vaccine on hamster models that had been established by Trimpert and his team at Freie Universität Berlin at the beginning of the pandemic. These rodents are currently the most important non-transgenic model organisms for research into the novel coronavirus, as they can be infected with the same virus variants as humans and develop similar symptoms. They found that after two doses of the vaccine, the virus could no longer replicate in the model organism. "We witnessed strong activation of the immunological memory, and the mucous membranes were very well protected by the high concentration of antibodies," Trimpert explains. The vaccine could therefore also significantly reduce the transmissibility of the virus.

In addition, the scientists compared the efficacy of the live attenuated vaccine with that of vaccines injected into the muscle. To do so, they vaccinated the hamsters either twice with the live vaccine, once with the mRNA and once with the live vaccine, or twice with an mRNA or adenovirus-based vaccine. Then, after the hamsters were infected with SARS-CoV-2, they used tissue samples from the nasal mucosa and lungs to see how strongly the virus was still able to attack the mucosal cells. They also determined the extent of the inflammatory response using single-cell sequencing. "The live attenuated vaccine performed better than the other vaccines in all parameters," Wyler summarizes. This is probably due to the fact that the nasally administered vaccine builds up immunity directly at the viral entry site. In addition, the live vaccine contains all components of the virus - not just the spike protein, as is the case with the mRNA vaccines. While spike is indeed the virus’s most important antigen, the immune system can also recognize the virus from about twenty other proteins.

Better than Conventional Vaccines

The best protection against the SARS-CoV-2 virus was provided by double nasal vaccination, followed by the combination of a muscular injection of the mRNA vaccine and the subsequent nasal administration of the live attenuated vaccine. "This means the live vaccine could be particularly interesting as a booster," says the study’s co-first author Julia Adler, a veterinarian and doctoral candidate at the Institute of Virology at Freie Universität Berlin.

Live attenuated vaccines have been used in vaccinations for a long time, such as in those for measles and rubella. But in the past, scientists generated the attenuation by chance - sometimes waiting years for mutations to evolve that produced an attenuated virus. The Berlin researchers, on the other hand, were able to specifically alter the genetic code of the coronaviruses. "We wanted to prevent the attenuated viruses from mutating back into a more aggressive variant," explains Dr. Dusan Kunec, a scientist at the Institute of Virology at Freie Universität Berlin and another co-author of the study. "This makes our live vaccine entirely safe and means it can be tailored to new virus variants," adds Kunec, who was instrumental in developing the vaccine.

The next step is safety testing: The researchers are collaborating with RocketVax AG, a Swiss start-up based in Basel. The biotech company is developing the live attenuated SARS-CoV-2 vaccine and preparing a phase one clinical trial in humans. "We are thrilled to be at the forefront of developing and manufacturing the live attenuated SARS-CoV-2 vaccine as a nasal spray at RocketVax. Our goal is to rapidly scale-up production and advance clinical development toward market access to provide protection against post-Covid symptoms for all. We see great potential in the market for seasonal nasal vaccines," says Dr. Vladimir Cmiljanovic, CEO of RocketVax.

The future will show which nasal vaccine will ultimately provide better protection. The manufacturers of the nasal adenovirus vaccines developed in India and China have not yet applied for approval in Europe. But one thing is clear to the scientists: since they are administered as nasal sprays or drops, nasal vaccines are a good option for use in places with limited access to trained medical staff. They are also inexpensive to produce and easy to store and transport. Last but not least, live attenuated vaccines such as this one have been proven to provide cross-protection against related viral strains, and thus presumably also against future SARS-CoV-2 variants.

OS 143/16-1 and SFB-TR84/Z01b, among others. The Berlin researchers are collaborating with the Swiss company RocketVax AG on the further development of the vaccine.

Jana Ehrhardt-Joswig After double vaccination with the live attenuated vaccine (A), the nasal mucosa in the hamster model is very well protected and shows hardly any changes from SARS-CoV-2 (B). The combination of live and mRNA vaccines (C) is also very effective, but the virus still finds small sites to attack (stained brown) in the nasal mucosa (D). In comparison, double intramuscular vaccines perform much worse in terms of protecting the nasal mucosa (E+F and G+H). They allow the virus to damage the upper tissue layers. Photo: Anne Voß, Institute of Veterinary Pathology, Freie Universität Berlin

Other Relevant Links to Participating Institutions

Dr. Jakob Trimpert, group leader / head of diagnostics, Institute of Virology, Freie Universität Berlin,
(0)30 838 650 288,

Dr. Emanuel Wyler, RNA Biology and Posttranscriptional Regulation Lab, Max Delbrück Center,
(0)30 9406 3009,

Dr. Geraldine Nouailles, group leader, Department of Pneumology, Respiratory Medicine, and Intensive Care Medicine with Sleep Medicine Unit, Charité - Universitätsmedizin Berlin, 
(0)30 450 553 347,

Jana Schlütter, editor, Communications Department, Max Delbrück Center,
(0)30 9406 2121, or

Max Delbrück Center

The Max Delbrück Center for Molecular Medicine, which is a member of the Helmholtz Association, is one of the world’s leading biomedical research institutions. Max Delbrück, a Berlin native, was a Nobel laureate and one of the founders of molecular biology. At the Center’s locations in Berlin-Buch and Mitte, researchers from some seventy countries analyze the human system - investigating the biological foundations of life from its most elementary building blocks to systems-wide mechanisms. By understanding what regulates or disrupts the dynamic equilibrium in a cell, an organ, or the entire body, we can prevent diseases, diagnose them earlier, and stop their progression with tailored therapies. Patients should benefit as soon as possible from basic research discoveries. The Max Delbrück Center therefore supports spin-off creation and participates in collaborative networks. It works in close partnership with Charité - Universitätsmedizin Berlin in the jointly run Experimental and Clinical Research Center (ECRC), as well as with the Berlin Institute of Health (BIH) at Charité and the German Center for Cardiovascular Research (DZHK). Founded in 1992, the Max Delbrück Center today employs 1,800 people and is funded ninety percent by the German federal government and ten percent by the State of Berlin.

Freie Universität Berlin

Freie Universität Berlin is a young, dynamic university with an international outlook located in the southwest of Germany’s capital city. It has received the title of "University of Excellence" three times through the Excellence Initiative jointly sponsored by the German federal government and the governments of the German states (in 2007, 2012, and 2019), most recently as a member of the Berlin University Alliance together with Humboldt-Universität, Technische Universität, and Charité - Universitätsmedizin Berlin (the joint medical faculty of Freie Universität and Humboldt-Universität). 460 professors conduct research across a wide spectrum of subjects at Freie Universität, from the humanities and social sciences right through to the natural sciences. Freie Universität Berlin was founded in 1948 by professors and students in response to the persecution faced by students who took a critical stance toward the system in place at Berlin’s main university at that time, which was located in the Soviet sector of the divided city. According to statistics from the Alexander von Humboldt Foundation and the German Academic Exchange Service (DAAD), Freie Universität Berlin is the most popular destination for top researchers from abroad as well as for international students. One-fifth of its roughly 33,500 students and one-third of its 4,000 doctoral candidates come from outside of Germany.

Charité - Universitätsmedizin Berlin

Charité - Universitätsmedizin Berlin is one of the largest university hospitals in Europe, boasting 3,099 beds and approximately 100 departments and institutes spread across four separate campuses. At Charité, the areas of research, teaching, and medical care are closely interlinked. With a total of 20,921 members of staff employed across its group of companies (17,615 of which work at Charité), the organization is one of the largest employers in Berlin. 5,047 of its employees work in the field of nursing, with a further 4,988 in research and medical care. Last year, Charité treated 123,793 inpatients and day patients in addition to 682,731 outpatients. In 2021, Charité recorded a turnover of approximately 2.3 billion euros (including external funding and investment grants) and set a new record by securing more than 215.8 million euros in external funding. Charité’s Medical Faculty is one of the largest in Germany, educating and training more than 9,000 students across the subjects of medicine, dentistry, health sciences, and nursing. Charité also offers 730 training positions across eleven different healthcare professions, in addition to 111 training positions in a further eight professions. Within the field of academic medicine, Charité’s priorities are highlighted by its main areas of research focus: infection; inflammation, and immunity including Covid-19 research; cardiovascular research and metabolism; neuroscience; oncology; regenerative therapies; and rare diseases and genetics. Examples of the work conducted by Charité researchers include involvement in twenty-eight DFG Collaborative Research Centers (of which seven are led by Charité), three Clusters of Excellence (of which one is led by Charité), ten Emmy Noether Independent Junior Research Groups, fourteen European Research Council grants, and eight European collaborative projects (coordinated by Charité).