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The debate around whether booster shots of Covid-19 vaccines will be needed to maintain good protection against the disease has intensified this week after one of the leading manufacturers announced it was seeing waning immunity.

Pfizer and its partner BioNTech said evidence was building that people’s immunity starts to decrease after they have been vaccinated. The companies pointed to real world data released by the Israel Ministry of Health, which showed that efficacy in preventing both infection and symptomatic disease has declined six months post-vaccination, although protection against serious illnesses and deaths remains very high.

Pfizer said it was picking up its efforts to develop a booster dose that will protect people from variants, adding that it would soon publish data on a third dose of vaccine and submit it to the US Food and Drug Administration (FDA), European Medicines Agency (EMA) and other regulators. Other vaccine makers, including Moderna, AstraZeneca and Johnson & Johnson, also said they were investigating the potential use of boosters, although they have not released any data showing a decrease in immunity.

But just hours after the Pfizer announcement, the FDA and US Centers for Disease Control and Prevention (CDC) pushed back. In an unprecedented joint statement, they emphasized that people who are fully vaccinated “do not need a booster shot at this time” and people who are unvaccinated should “get vaccinated as soon as possible to protect themselves and their community.”

The CDC said yesterday there was “no evidence yet that immunity is starting to wear off among people who got vaccinated against coronavirus early on.” Similarly, the EMA has said it was “too early” to confirm whether a booster dose for coronavirus vaccines will be needed.

Meanwhile, the World Health Organization (WHO) has urged rich countries to hold off on giving third doses of coronavirus vaccines to their residents before people in other countries can even get their first doses.

But some nations are already drawing up their booster plans. The UK, for example, said last month it may start rolling out a third dose to vulnerable people from September, in hopes this would prevent a winter spike in cases.

The WHO said this is a dangerous approach, because it could divert doses from the developing world. “What part of ‘this is a global crisis,’ are we not getting? This is still a global crisis,” said Dr. Michael Ryan, executive director with the WHO Health Emergencies Program. “There’s some people who want to have their cake and eat it, then they make some more cake, and they want to eat that as well,” he added.

YOU ASKED. WE ANSWERED.

Q: When will the vaccine for younger children be available in the US?

A: It’s going to be months, if not longer, until we have more information on this. That’s because pharmaceutical companies are still doing clinical trials to see how coronavirus vaccines work in children under 12, if they’re safe and what the right dose should be. Pfizer predicts that they will have more data from their trials, in which children 5 to 11 years old are enrolled, by the fall. Moderna has not provided a timeline on when the trial data results from their study – which is enrolling children aged 6 months to 11 years – might be available.

To clear up confusion about masking, we turned to CNN Medical Analyst Dr. Leana Wen for her thoughts.

Wen said several factors are at play here, including your health and the vaccination status of those in your household. Immunocompromised people should be wearing a mask in all indoor settings where they could be exposed to unvaccinated people.

The level of coronavirus infection and the rate of vaccination in your community is another important factor, Wen said.

“Risk is cumulative. If you have multiple encounters every day with unvaccinated people, and there is a high level of community transmission in your area, your chances of having a breakthrough infection after vaccination will increase. You can reduce that risk by wearing a mask in the highest risk settings,” she said.

Send your questions here. Are you a health care worker fighting Covid-19? Message us on WhatsApp about the challenges you’re facing: +1 347-322-0415.

TOP 3 READS OF THE WEEK

Biden targets anti-vaccine misinformation

As Europe struggles with a rising number of coronavirus cases caused by the Delta variant, several countries are making vaccinations compulsory for health care workers.

France and Greece both announced new vaccine requirements this week, following in the footsteps of Italy, which made vaccinations compulsory for health employees in April. The UK government has previously said it will mandate shots for care home staff from October. France said those who refuse would be suspended without pay.

But not all health care workers are happy with the move. In Italy, several court challenges launched by those who do not want to get vaccinated are being heard this week. In the UK, a petition against the plan to make vaccines compulsory has attracted more than 72,000 signatures.

French President Emmanuel Macron talks to employees at a vaccine packaging plant.

Indonesia battles a devastating situation, with its peak still likely to come

COVAX, the vaccine sharing scheme designed to help poorer countries access shots, has signed agreements with two Chinese pharmaceutical companies to buy more than half a billion of their Covid-19 vaccines by the first half of next year, Gavi, the global vaccine alliance, announced Monday.

COVAX’s rollout fell behind schedule earlier this year, after a coronavirus crisis in India meant the country’s biggest vaccine manufacturer failed to deliver millions of shots on time, so the boost in supply is welcome news.

Indonesia, the world’s fourth-most populous country, is fast becoming the new center of Asia’s coronavirus crisis as the Delta variant ravages the country. For weeks, the archipelago nation has been reporting thousands of daily cases and hundreds of deaths. Hospitals are running dangerously low on supplies, excavators are frantically digging burial plots, and isolating remains impossible for millions living on the poverty line.

The Pacific’s Covid-19 crisis has become a political power play

Nearly half of Jakarta’s residents may have contracted Covid-19, according to a health survey – more than 12 times the number of cases officially recorded in the Indonesian capital at the time when the research was carried out.

This uptick in the city comes as Indonesia – the world’s fourth most populous nation – faces a dire stage in its battle with the pandemic, recording tens of thousands of daily cases and up to 1,000 deaths a day nationwide in one of Asia’s worst outbreaks.

For years, China and Australia have jockeyed for influence in the Pacific, a region of 14 island nations and territories whose location (between the US and Asia) has made them desirable for military and defense ambitions on both sides. Australia has longstanding economic and cultural ties with the Pacific, and it is crucial to the country’s national security to ensure the Chinese government doesn’t gain a large foothold in the region. For Beijing , the region represents an opportunity to expand its influence.

TOP TIP

Read why experts say that while Chinese vaccines might not be as effective as some, they’re not a failure. No vaccine gives 100% protection against Covid-19, so breakthrough cases are to be expected.

Feeling anxiety about your body image coming out of lockdown? You’re not alone.

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