Saturday, November 21, 2020


COVID-19 UPDATES

 UK volunteer first in the world to trial coronavirus antibody treatment

Fri, 20 November 2020


The UK is to become the first country to begin clinical trials of a new coronavirus antibody treatment aimed at people with a weakened immune system who cannot be vaccinated.

A volunteer in Wakefield, West Yorkshire, will be the first in the world to receive AstraZeneca's new "antibody cocktail" as part of the trial to test whether it will prevent COVID-19 for up to year.

The clinical trial programme will recruit 5,000 participants, which includes 1,000 people from nine sites in the UK.

The aim of the trial is to evaluate the safety and effectiveness of a combination of two long-acting monoclonal antibodies - man-made proteins that act like natural human antibodies in the immune system.

Sir Mene Pangalos, executive vice president of biopharmaceuticals R&D at AstraZeneca, said the treatment can be injected or administered intravenously.

"There is going to be a significant number of people - even in a world where vaccines are highly effective - who will not respond to vaccines, or in fact will not take vaccines," he added.

"So having monoclonal antibodies as potential therapeutics is also important."

The UK government has an in-principle agreement to secure access to one million doses of the antibody combination, dubbed AZD7442, if it is successful in the phase three trials.

The trial aims to enrol adults who are at increased risk of coronavirus infection or who are more likely to have an inadequate response to vaccination, and will include people from health care and care home settings.

Initial results from the randomised control trial are expected to be published in the first half of 2021, although the trial is expected to last for 12 months.

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While it is unclear how much the antibody treatment will cost, Sir Mene said it will be "more expensive than vaccines", but added "we hope to make it cost effective".

Business Secretary Alok Sharma said: "As we move closer to a COVID-19 vaccine, we must keep driving forward clinical trials for new and alternative treatments that protect our vulnerable, particularly those who cannot receive a vaccine."

Childhood vaccine linked to less severe COVID-19, cigarette smoke raises risk


By Nancy Lapid
Fri, 20 November 2020
An illustration, created at the Centers for Disease Control and Prevention (CDC), depicts the 2019 Novel Coronavirus


By Nancy Lapid

(Reuters) - The following is a roundup of some of the latest scientific studies on the novel coronavirus and efforts to find treatments and vaccines for COVID-19, the illness caused by the virus.

Childhood vaccine may help prevent severe COVID-19

People whose immune systems responded strongly to a measles-mumps-rubella (MMR) vaccine may be less likely to become severely ill if they are infected with the new coronavirus, new data suggest. The MMR II vaccine, manufactured by Merck and licensed in 1979, works by triggering the immune system to produce antibodies. Researchers reported on Friday in mBio that among 50 COVID-19 patients under the age of 42 who had received the MMR II as children, the higher their titers -- or levels -- of so-called IgG antibodies produced by the vaccine and directed against the mumps virus in particular, the less severe their symptoms. People with the highest mumps antibody titers had asymptomatic COVID-19. More research is needed to prove the vaccine prevents severe COVID-19. Still, the new findings "may explain why children have a much lower COVID-19 case rate than adults, as well as a much lower death rate," coauthor Jeffrey Gold, president of World Organization, in Watkinsville, Georgia, said in a statement. "The majority of children get their first MMR vaccination around 12 to 15 months of age and a second one from 4 to 6 years of age." (https://bit.ly/3kPnW6P)

Cigarette smoke increases cell vulnerability to COVID-19


Exposure to cigarette smoke makes airway cells more vulnerable to infection with the new coronavirus, UCLA researchers found. They obtained airway-lining cells from five individuals without COVID-19 and exposed some of the cells to cigarette smoke in test tubes. Then they exposed all the cells to the coronavirus. Compared to cells not exposed to the smoke, smoke-exposed cells were two- or even three-times more likely to become infected with the virus, the researchers reported on Tuesday in Cell Stem Cell. Analysis of individual airway cells showed the cigarette smoke reduced the immune response to the virus. "If you think of the airways like the high walls that protect a castle, smoking cigarettes is like creating holes in these walls," coauthor Brigitte Gomperts told Reuters. "Smoking reduces the natural defenses and this allows the virus to enter and take over the cells." (https://bit.ly/3kPAYRx)

AstraZeneca's COVID-19 vaccine shows promise in elderly

AstraZeneca and Oxford University's experimental COVID-19 vaccine produced strong immune responses in older adults in a mid-stage trial, researchers reported on Thursday in The Lancet. Late-stage trials are underway to confirm whether the vaccine protects against COVID-19 in a broad range of people, including those with underlying health conditions. The current study involved 560 healthy volunteers, including 240 age 70 or over. Volunteers received one or two doses of the vaccine, made from a weakened version of a common cold virus found in chimpanzees, or a placebo. No serious side effects were reported. Participants older than 80, frail patients, and those with substantial chronic illnesses were excluded, according to an editorial published with the study. "Frailty is increasingly understood to affect older adults' responses to vaccines," the editorialists write. "A plan for how to consider frailty in COVID-19 vaccine development is important." 
https://bit.ly/35OVrlq; https://bit.ly/3kKXDhP; https://reut.rs/2IVeod0

Researchers look into cells infected with new coronavirus

Cells infected with the new coronavirus die within a day or two, and researchers have found a way to see what the virus is doing to them. By integrating multiple imaging techniques, they saw the virus create "virus-copying factories" in cells that look like clusters of balloons. The virus also disrupts cellular systems responsible for secreting substances, the researchers reported on Tuesday in Cell Host & Microbe. Furthermore, it reorganizes the "cytoskeleton," which gives cells their shape and "serves like a railway system to allow the transport of various cargos inside the cell," coauthor Dr. Ralf Bartenschlager of the University of Heidelberg, Germany told Reuters. When his team added drugs that affect the cytoskeleton, the virus had trouble making copies of itself, "which indicates to us that the virus needs to reorganize the cytoskeleton in order to replicate with high efficiency," Bartenschlager said. "We now have a much better idea how SARS-CoV-2 changes the intracellular architecture of the infected cell and this will help us to understand why the cells are dying so quickly." The Zika virus causes similar cell changes, he said, so it might be possible to develop drugs for COVID-19 that also work against other viruses. https://bit.ly/2UI9BOT

Open https://tmsnrt.rs/3a5EyDh in an external browser for a Reuters graphic on vaccines and treatments in development.

(Reporting by Nancy Lapid, Kate Kelland and Alistair Smout; Editing by Tiffany Wu)

Cesarean section-born children may face higher risk of infection-related hospitalisation

November 22, 2020 


Children born via cesarean section may be more likely to be hospitalised for infection during early childhood. A study published in PLOS Medicine by Jessica Miller at the Murdoch Children's Research Institute, Australia and colleagues suggests that compared to vaginally-born children, cesarean-born children may have a higher risk of infection-related hospitalisation for up to five years of age.

While the researchers were able to observe an association between birth by cesarean section and an increased risk of infection, the study was limited in that postnatal factors that influence infection risk, such as breast feeding, vaccination status, and postnatal smoke exposure were unavailable, which could potentially confound the results.

The authors stress that the findings should not discourage women from having cesareans when medically indicated and despite the small increased risk of childhood infections, cesarean births may be the safest option for some women and babies.

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