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                Roche develops new serology test to detect COVID-19 antibodies

                Roche develops new serology test to detect COVID-19 antibodies

                Novartis announces data in Neurology reinforcing the real-world and long-term effectiveness and safety of Aimovig® as a preventive treatment across the full spectrum of migraine

                Novartis announces data in Neurology reinforcing the real-world and long-term effectiveness and safety of Aimovig® as a preventive treatment across the full spectrum of migraine

                EMA review of Picato concludes medicine’s risks outweigh its benefits

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                Increased Rate of Infections May Indicate a Future Cancer Diagnosis

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                Remdesivir improved majority of patients hospitalized with severe COVID-19

                Blood Test May Help Doctors Catch Pancreatic Cancer Early

                Blood Test May Help Doctors Catch Pancreatic Cancer Early

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                Mental health and brain research must be a higher priority in global response to tackle COVID-19 pandemic

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                  Unusually Clear Skies Drove Record Loss of Greenland Ice in 2019

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                  Volcanic CO2 emissions helped trigger Triassic climate change

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                          Engineered Virus Might be Able to Block Coronavirus Infections, Mouse Study Shows

                          by Insciences
                          April 8, 2020
                          in Health & Medicine, Human Science, Life Science
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                          Highlights:

                          • No vaccines exist for human coronavirus infections. A new intranasal vaccine using an RNA virus for gene delivery protects against fatal MERS coronavirus infections in mice.
                          • The mice were genetically engineered to be susceptible to the MERS virus. All the mice that received the vaccine survived MERS, while the mice that had not received the vaccine did not.
                          • The researchers are now applying the same strategy to develop a vaccine for SARS-CoV-2, the virus that causes COVID-19, which has infected more than a million people worldwide. 

                          Washington, DC – April 7, 2020 – No vaccines exist that protect people against infections by coronaviruses, including SARS-CoV-2, which causes COVID-19, or the ones that cause SARS and MERS. As COVID-19 continues to wreak havoc, many labs around the world have developed a laser-like focus on understanding the virus and finding the best strategy for stopping it.

                          This week in mBio, a journal of the American Society of Microbiology, a team of interdisciplinary researchers describes a promising vaccine candidate against the MERS virus. Since the MERS (Middle East Respiratory Syndrome) outbreak began in 2012,  more than 850 people have died, and studies suggest the virus has a case fatality rate of more than 30%.

                          In the new paper, the researchers suggest that the approach they took for a MERS virus vaccine may also work against SARS-CoV-2. The vaccine’s delivery method is an RNA virus called parainfluenza virus 5 (PIV5), which is believed to cause a condition known as kennel cough in dogs but appears harmless to people. The researchers added an extra gene to the virus so that infected cells would produce the S, or spike, glycoprotein known to be involved in MERS infections. 

                          “We know people have been exposed to PIV5, but it seems to be an innocuous virus in humans,” said pediatric pulmonologist and coronavirus expert Paul McCray, M.D., at the University of Iowa, in Iowa City, who co-led the new study with virologist Biao He, Ph.D., at the University of Georgia, in Athens. “PIV5 doesn’t seem to cause a cytopathic effect.” The MERS virus cannot replicate in mice, so to test the vaccine McCray developed a mouse model that mimics human infections. The mice had been genetically engineered to express DPP4, the protein used by the MERS virus as an entry point for human cells. 

                          Lab tests showed that a single dose of the vaccine, given intranasally, effectively caused infected cells to produce the S protein, which in turn triggered immune responses against the protein in the animal host.

                          Four weeks after the mice received the vaccine, they were exposed to a strain of the MERS virus, adapted to the mice to cause a lethal infection. The MERS virus was also given to groups of mice that had received a different PIV5 vaccine—one without the genes for the S protein—or an intramuscular vaccine with inactivated MERS virus.

                          All the mice immunized with the modified PIV5 virus survived MERS virus infection. In contrast, all the mice immunized with the PIV5 without S died from the infection. The intramuscular vaccine of inactivated MERS virus only protected 25% of the mice from a lethal infection. The mice that received inactivated MERS virus showed above-average levels of eosinophils, white blood cells that indicate infection or inflammation. This connection raises a safety concern for inactivated MERS virus as a potential vaccine, said He. The study demonstrates that an intranasal, PIV5-based vaccine is effective  against MERS in mice, said He, and should be investigated for its potential against other dangerous coronaviruses, including SARS-CoV-2.

                          “We’re quite interested in using viruses as gene delivery vehicles,” said McCray, who has also investigated similar strategies as a way to treat cystic fibrosis. Now, like colleagues around the world, McCray and He have both focused their research efforts on SARS-CoV-2, taking a similar tack to working with mouse models of infection and testing vaccines.

                          Finding an effective vaccine against the coronavirus that causes COVID-19 is a race against time, McCray said. “One hundred percent of the population is not going to be exposed to the virus the first time around, which means there will be more people to infect when it comes again,” he said. “We don’t know yet if people get lasting immunity from the SARS-CoV-2 infection, so it’s important to think about ways to protect the population.” 

                          Source: The American Society for Microbiology

                          The American Society for Microbiology is one of the largest professional societies dedicated to the life sciences and is composed of 30,000 scientists and health practitioners. ASM’s mission is to promote and advance the microbial sciences.

                          ASM advances the microbial sciences through conferences, publications, certifications and educational opportunities. It enhances laboratory capacity around the globe through training and resources. It provides a network for scientists in academia, industry and clinical settings. Additionally, ASM promotes a deeper understanding of the microbial sciences to diverse audiences.

                          Tags: CoronavirusCOVID-19MERS coronavirusparainfluenza virus 5PIV5PIV5-based vaccineRNA virusSARS-CoV-2vaccines
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