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Researchers test mRNA technology for universal flu vaccine

By Nancy Lapid (Reuters) - An experimental vaccine provided broad protection against all 20 known influenza A and B virus subtypes in initial tests in mice and ferrets,...
Researchers test mRNA technology for universal flu vaccine © Reuters. FILE PHOTO: People enter a pharmacy next to a sign promoting flu shots in New York January 10, 2013. REUTERS/Andrew Kelly/File Photo
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By Nancy Lapid

(Reuters) - An experimental vaccine provided broad protection against all 20 known influenza A and B virus subtypes in initial tests in mice and ferrets, potentially opening a pathway to a universal flu shot that might help prevent future pandemics, according to a U.S. study published on Thursday.

The two-dose vaccine employs the same messenger RNA (mRNA)technology used in the COVID-19 shots developed by Pfizer (NYSE:PFE) with BioNTech, and by Moderna (NASDAQ:MRNA). It delivers tiny lipid particles containing mRNA instructions for cells to create replicas of so-called hemagglutinin proteins that appear on influenza virus surfaces.

A universal vaccine would not mean an end to flu seasons, but would replace the guess work that goes into developing annual shots months ahead of flu season each year.

"The idea here is to have a vaccine that will give people a baseline level of immune memory to diverse flu strains, so that there will be far less disease and death when the next flu pandemic occurs," study leader Scott Hensley of the Perelman School of Medicine at the University of Pennsylvania said in a statement.

Unlike standard flu vaccines that deliver one or two versions of hemagglutinin, the experimental vaccine includes 20 different types in the hope of getting the immune system to recognize any flu virus it might encounter in the future.

In lab experiments, vaccinated animals' immune systems recognized the hemagglutinin proteins and defended against 18 different strains of influenza A and two strains of influenza B. Antibody levels induced by the vaccine remained unchanged for at least four months, according to a report published in the journal Science.

The vaccine reduced signs of illness and protected from death even when the ferrets were exposed to a different type of flu not in the vaccine, the researchers said.

Moderna and Pfizer both have mRNA flu vaccines in late-stage human trials, and GSK and partner CureVac are testing an mRNA flu vaccine in an early-stage safety trial in humans. These vaccines are designed to defend against only four recently-circulating influenza strains but could theoretically be changed up each year.

The universal flu vaccine, if successful in human trials, would not necessarily prevent infection. The goal is to provide durable protection against severe disease and death, Hensley said.

Questions remain regarding how to judge efficacy and potential regulatory requirements for a vaccine against possible future viruses that are not currently circulating, Alyson Kelvin and Darryl Falzarano of the University of Saskatchewan, Canada, wrote in a commentary published with the study.

While the promising results with the new vaccine "suggest a protective capacity against all subtypes of influenza viruses, we cannot be sure until clinical trials in volunteers are done," Adolfo García-Sastrem, director of the Institute for Global Health and Emerging Pathogens at Mount Sinai Hospital in New York, said in a statement.

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06-12-2022 00:48:21 (UTC+7)

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    EUR/USD 1.0495 ↑ Sell  
    GBP/USD 1.2183 Neutral  
    USD/JPY 136.65 ↑ Buy  
    AUD/USD 0.6707 ↑ Sell  
    USD/CAD 1.3578 Neutral  
    EUR/JPY 143.40 ↑ Sell  
    EUR/CHF 0.9887 ↑ Sell  
    Gold 1,782.45 ↑ Sell  
    Silver 22.407 Buy  
    Copper 3.7947 ↑ Sell  
    Crude Oil WTI 78.42 ↑ Sell  
    Brent Oil 84.07 ↑ Sell  
    Natural Gas 5.656 Sell  
    US Coffee C 163.27 ↑ Buy  
    Euro Stoxx 50 3,956.53 ↑ Sell  
    S&P 500 4,011.00 ↑ Sell  
    DAX 14,447.61 ↑ Sell  
    FTSE 100 7,567.54 ↑ Sell  
    Hang Seng 19,518.29 Buy  
    Small Cap 2000 1,842.85 ↑ Buy  
    IBEX 35 8,370.10 ↑ Sell  
    BASF 47.970 Sell  
    Bayer 53.09 ↑ Buy  
    Allianz 203.00 Buy  
    Adidas 122.06 ↑ Sell  
    Lufthansa 7.766 ↑ Buy  
    Siemens AG 135.44 ↑ Buy  
    Deutsche Bank AG 10.150 Neutral  
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