Covid Booster Shots Beginning in Several Nations

The Czech Republic joins several countries to say it will recommend extra shots, while much of the world remains unvaccinated.

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Several industrialized nations are beginning to give booster shots this month.

Ivan Fischer, the founder of Budapest’s Festival Orchestra, received a third dose of coronavirus vaccine during a promotion at a concert last week.Credit…Laszlo Balogh/Associated Press

Sept. 2, 2021, 5:18 a.m. ET

This month, several countries have begun or will start giving booster shots to people already vaccinated against the coronavirus, in an effort to bolster immunity in the face of the fast-spreading Delta variant and the change to a cooler season that is likely to bring more people together indoors.

The Czech Republic announced this week that it would offer a booster, beginning Sept. 20, to anyone who had previously been vaccinated with either a single or double dose. The country strongly recommended boosters for people over 60.

Similar policies were recently announced in Germany and France, which are offering boosters to older people and those with underlying health conditions. And Israel is now offering boosters to vaccinated people as young as 12.

In the United States, the Biden administration has said it is planning to offer booster shots to most Americans eight months after vaccination, assuming federal regulators clear them.

Despite the flurry of booster programs in wealthier nations, the science of whether they are needed is not yet clear.

Some studies suggest that the protection that the vaccines provide against infection and mild disease may be waning. But they remain highly effective at preventing the worst outcomes, including severe disease and death, and scientists have said that a blanket recommendation for boosters is premature.

Experts generally agree, however, that a third shot is warranted for people with compromised immune systems, who may not have mounted a strong immune response to the initial doses. Several countries, including the United States, are now offering additional shots to this vulnerable group.

On Thursday, the European Medicines Agency, the E.U.’s drug regulator, said there was no urgent need to give booster doses of Covid-19 vaccine to fully inoculated individuals without underlying health issues, citing a report from the European Center for Disease Prevention and Control. Extra doses should be considered for those with weakened immune systems, and as a precautionary measure for frail older adults, especially those living in nursing homes, the agencies added.

The agency said that at this time, the urgency is to finish vaccinating all those eligible for a normal vaccination course. The drug regulator is continuing to assess data on booster shots.

Britain’s health secretary, Sajid Javid, said on Wednesday that a third vaccine dose would be offered to those aged 12 and over with severely compromised immune systems “as soon as possible.”

Understand Vaccine and Mask Mandates in the U.S.

Vaccine rules. On Aug. 23, the Food and Drug Administration granted full approval to Pfizer-BioNTech’s coronavirus vaccine for people 16 and up, paving the way for an increase in mandates in both the public and private sectors. Private companies have been increasingly mandating vaccines for employees. Such mandates are legally allowed and have been upheld in court challenges.Mask rules. The Centers for Disease Control and Prevention in July recommended that all Americans, regardless of vaccination status, wear masks in indoor public places within areas experiencing outbreaks, a reversal of the guidance it offered in May. See where the C.D.C. guidance would apply, and where states have instituted their own mask policies. The battle over masks has become contentious in some states, with some local leaders defying state bans.College and universities. More than 400 colleges and universities are requiring students to be vaccinated against Covid-19. Almost all are in states that voted for President Biden.Schools. Both California and New York City have introduced vaccine mandates for education staff. A survey released in August found that many American parents of school-age children are opposed to mandated vaccines for students, but were more supportive of mask mandates for students, teachers and staff members who do not have their shots. Hospitals and medical centers. Many hospitals and major health systems are requiring employees to get a Covid-19 vaccine, citing rising caseloads fueled by the Delta variant and stubbornly low vaccination rates in their communities, even within their work force.New York City. Proof of vaccination is required of workers and customers for indoor dining, gyms, performances and other indoor situations, although enforcement does not begin until Sept. 13. Teachers and other education workers in the city’s vast school system will need to have at least one vaccine dose by Sept. 27, without the option of weekly testing. City hospital workers must also get a vaccine or be subjected to weekly testing. Similar rules are in place for New York State employees.At the federal level. The Pentagon announced that it would seek to make coronavirus vaccinations mandatory for the country’s 1.3 million active-duty troops “no later” than the middle of September. President Biden announced that all civilian federal employees would have to be vaccinated against the coronavirus or submit to regular testing, social distancing, mask requirements and restrictions on most travel.

“I am determined to ensure we are doing all we can to protect people in this group and a third dose will help deliver that,” Mr. Javid said in a statement.

But the decision by some nations to give booster shots to healthy vaccinated people — when many countries have nascent vaccination programs — has raised ethical questions.

In early August, Dr. Tedros Adhanom Ghebreyesus, the director general of the World Health Organization, called for a moratorium on coronavirus vaccine booster shots until the end of September, and an “urgent reversal” in the global supply of vaccines that had mainly gone to wealthier nations, leaving low-income countries vulnerable.

W.H.O. officials have taken pains to distinguish between booster shots used to shore up immunity in vaccinated populations and additional doses that may be needed by the immunocompromised to develop immunity in the first place.

On Wednesday, Dr. Tedros reiterated the point.

“Third doses may be necessary for the most at-risk populations where there is evidence of waning immunity against severe disease and death, such as the very small group of immunocompromised people who did not respond sufficiently to their initial doses or are no longer producing antibodies,” he said at a news conference. “But for now we do not want to see widespread use of boosters for healthy people who are fully vaccinated.”

Emily Anthes, Monika Pronczuk and Daniel E. Slotnik contributed reporting.

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