Science & Technology

There are three Covid vaccines in the United States — testing new vaccines is complex

“If regulators accept immune markers, which are an established correlation of prevention, it will be very powerful because it is relatively easy to study vaccines,” said some Fred Hutchinson cancers. Peter Gilbert, a biostatistician at the Research Center, says of the Covid-19 Prevention Network.

However, the various ways vaccines attack the virus complicate bidding on universal standards. “The big question is whether the correlations are translated between vaccine platforms,” says Gilbert. His team is committed to correlative search and relies on biostatistical techniques honed in other vaccine and HIV studies. The team pivoted when Covid-19 arrived.

Hu said Covaxx is exploring the concept of correlation to shorten the company’s trial in Brazil, but the strategy rests on a regulatory path that doesn’t yet exist. An FDA spokesperson wrote in an email that establishing correlations is “the main focus of federal and non-federal investigations.” She added that the agency “provides additional information as discussions with product manufacturers and international counterparts progress.”

Pharmaceutical companies using already licensed vaccines are also keen on correlation. A Pfizer spokeswoman wrote in an email that these immune response markers could help test or test vaccines in children and children with a weakened immune system. Booster targeting variants..

Apart from this, the FDA Recently announced Modified vaccines tailored to block new mutants may be able to stop long clinical trials. Under that guidance, Novavax hopes that boosters modified from current vaccine candidates will be able to undergo immune response studies in a relatively small 400 people, a spokeswoman for the company said. ..

The Covid-19 Prevention Network is looking for a correlation between Modana’s vaccine protection and planned analysis of Novabax, Johnson & Johnson, and AstraZeneca vaccines. There is urgency behind that effort.

“Soon, at least in the United States, we will not be able to conduct large-scale placebo-controlled trials,” said Dan Baruch, a virologist at the Beth Israel Medical Center in Boston.He contributed December studyWas announced in Nature, A specific antibody was detected in the blood of monkeys, predicting protection against Covid-19. The findings have increased the broader confidence that blood tests can do the same for humans. “Our animal model data are very promising,” says Barouch, but he warns that variants pose yet another challenge in identifying correlations.

For vaccine makers approaching late-stage trials, another potential option may be to compare vaccine candidates with those already approved. However, direct studies require more participants than regular trials involving 30,000 subjects. Instead, vaccine makers seem to be mostly abroad, and the allowed shots aren’t immediately available, so residents are looking for a place to volunteer.

In the second quarter of this year, San Diego-based Arcturus Therapeutics will conduct a phase III trial of a single-shot RNA vaccine in a country with a high prevalence of Covid and little or no access to the original vaccine. .. “We can’t do this in the United States,” says CEO Joseph Payne. “But there are more than 200 countries in the world, and the majority of them haven’t been vaccinated yet.” (The company hasn’t yet revealed which countries will be involved.)

Submitting vaccine study data from other countries will require additional scrutiny by the FDA. However, David Curiel, interim CEO of St. Louis-based Precision Virologics, is based on consultant testing infrastructure, protocols, and the knowledge of India-based collaborator Bharat Biotech for his company from India. We believe that the final test data will be successfully communicated to the agency. With various regulators. Bharat oversees Phase I trials as part of a larger partnership between the two companies. Curiel said the close relationship between Indian government officials and various villages helped to expedite the recruitment of test subjects. “They have a network in place that enables the rapid outbreak and implementation of vaccine trials,” says Curiel.

There are three Covid vaccines in the United States — testing new vaccines is complex There are three Covid vaccines in the United States — testing new vaccines is complex

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