内容摘要：In June, an influential panel of advisers to the CDC is set to debate which vaccines should be recommended to which groups.

In June, an influential panel of advisers to the CDC is set to debate which vaccines should be recommended to which groups.

A combination shot forand COVID-19 using messenger RNA generated antibodies in a study, but

regulators want to see data on whether the new vaccine protects people from getting sick.Researchers from vaccine-maker Moderna reported in a study published Wednesday that the new combo shot generated a stronger immune response against COVID-19 and most strains of flu than existing standalone shots in people 50 and older. Side effects were injection site pain, fatigue and headaches. Moderna previously reported a summary of the results from the company-sponsored trial in 8,000 people.The mRNA technology is used in approved

shots, but has not yet been approved for a flu shot. Moderna believes mRNA could speed up production of flu shots compared with traditional processes that use chicken eggs or giant vats of cells. A combo shot also might improve vaccination rates, the researchers wrote in the study published in the Journal of the American Medical Association.Dr. Greg Poland, who studies vaccine response at Mayo Clinic and was not involved in the new study, said he’s not convinced that a combo shot would be popular. And while flu comes in seasonal waves, COVID-19 has been spreading throughout the year, Poland said, posing challenges for how to time the shots to keep protection strong.

He’d also like to see data on how well the new shot protected people from infection and hospitalization.

The findings are based on measuring antibodies in participants’ blood after 29 days, an indication of short-term disease protection.The protest in Belgrade was organized by Serbia’s university students, who have been a key force behind the nationwide demonstrations triggered by

in the country’s north that killed 16 people.Many people in Serbia believe that the deadly crash was the result of flawed renovation work on the station building, and they link the disaster to alleged government corruption in major infrastructure projects with Chinese state companies.

Protesting university students have been demanding accountability for the crash and the rule of law in Serbia, a Balkan nation that is formally seeking European Union entry but where the ruling populists have been accused ofAfter months-long protests drawing