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Popularization of research advances on COVID-19

Vaccines

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CoVac-1, a promising candidate vaccine

One of the solutions against the SARS-CoV-2 virus, which is responsible for COVID-19, is vaccines that are able to confer long-lasting immunity, especially in sectors of the population at high risk from complications. Currently available vaccines bring about a strong neutralising antibody response. But T lymphocytes also play an important role in antiviral defences by […]

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Does vaccine efficacy depend on antibody levels?

In the fight against the COVID-19 pandemic it is important to have a varied arsenal of safe and effective vaccines. Since global demand is high, prices must remain low enough to ensure equitable worldwide distribution. To complicate matters, we do not have data on vaccine efficacy for certain sectors of the population (pregnant women, children, […]

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The non-coding region of the mRNA of the Curevac vaccine has been optimised

Unlike other mRNA vaccines, the CVnCoV developed by CureVac does not use pseudouridine or nucleoside modification. The mRNA of the SARS-CoV-2 spike, which enables viral entry and is the main target of neutralising antibodies, is encapsulated in lipid nanoparticles in its stabilized pre-fusion form. Its efficacy has been evaluated in the HERALD (phase 2b/3) clinical […]

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Is the approach to anti-COVID-19 vaccination comparable to other anti-flu campaigns?

The majority of vaccines against respiratory infections are effective against symptomatic cases, but do not completely block infection. In the case of COVID-19, first results showed that the mRNA vaccines were very effective against symptomatic and asymptomatic infections, as well as against transmission. This news raised hopes that anti-SARS-CoV-2 vaccines could stop the spread of […]

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Simultaneous vaccine against COVID-19 and flu

Vaccination against SARS-CoV-2 has enabled the prevention of numerous cases of COVID-19, and numerous deaths. But this process of mass vaccination takes its toll on health systems since it involves many health professionals. In several countries, vaccination against COVID-19 is given at the same time as vaccination against winter flu. This latter is important since […]

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Moderna and Pfizer-Biontech vaccines against the Delta variant in Qatar

In Qatar, the SARS-CoV-2 Alpha variant and then the Beta variant, were at the origin of two major epidemic waves at the beginning of 2021. It was later, in March, that the Delta variant was detected. It then spread throughout the country and was responsible for 43% of infections up to September. However, the vaccination […]

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The efficacy of the vaccine against Delta

The Pfizer-BioNTech mRNA vaccine protects against infections, hospitalisations and severe cases of COVID-19. It reduces viral load and therefore reduces the infectiousness of the individual, thus hampering the virus’ spread. In Israel, SARS-CoV-2 had been largely eradicated between April and June 2021, but then the epidemic began to progress again. Israel, in common with other […]

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The efficacy of anti-COVID-19 vaccines: a study on American veterans

Current vaccines, notably the Janssen vaccine, and the Moderna and Pfizer-BioNTech vaccines which use mRNA technology, are effective in the prevention of symptomatic COVID-19. These vaccines also reduce infection by the SARS-CoV-2 virus. In common with other countries, the United States began its vaccination campaign at the end of 2020. But over time, and because […]

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Is it more effective to combine different vaccines?

There are a number of different anti-COVID-19 vaccines currently available. Rare but serious side effects have been reported for the AstraZeneca (AZ) vaccine. Several countries have therefore decided to administer the Pfizer-BioNTech (PB) vaccine to people younger than 55 who have already had a 1st dose of AZ. Previous clinical studies have analysed the efficacy […]

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