Covid variants will be the next big challenge. Can vaccines protect us? – The Guardian

Some vaccines show appealing signs of coping with new versions– the mRNA vaccines produced by Pfizer and Moderna appear to provide some security versus the variations first identified in Kent and South Africa. Clinical trials and laboratory studies show the AstraZeneca vaccine is just about 10% reliable at securing against the South African variation, however scientists still think the jab will protect versus severe illness from this variant. A new vaccine might be needed every year or every few years, depending on how quickly versions emerge.Of course there is always the possibility of an end ofthe world variation that escapes all existing vaccines and natural immunity.

Some vaccines reveal promising indications of coping with brand-new variants– the mRNA vaccines produced by Pfizer and Moderna seem to use some protection versus the variations initially determined in Kent and South Africa. Some vaccines may offer little or no security against individuals becoming infected by a Covid-19 version and passing this on to others (but professionals think that vaccines, together with a hosts natural immune action, ought to still use adequate recurring security to avoid serious illness and death). Scientific trials and lab research studies reveal the AstraZeneca vaccine is only about 10% efficient at protecting against the South African variation, however scientists still think the jab will safeguard against severe illness from this variation. Another question is how long vaccine immunity lasts for, and whether individuals end up being more susceptible to different versions as their antibody levels drop over time.Virologists are hoping that the vaccines will induce what we refer to as long-term anamnestic immunity. A brand-new vaccine may be needed each year or every few years, depending on how quickly versions emerge.Of course there is always the possibility of a doomsday variant that gets away all existing vaccines and natural immunity.

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