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Prior COVID-19 infection more protective than vaccine during delta surge: US study

People who had previously been infected with COVID-19 were better protected against the delta variant than those who were vaccinated alone, suggesting that natural immunity was a more potent shield than vaccines against that variant, California and New York health officials reported on Wednesday.

Protection against delta was highest, however, among people who were both vaccinated and had survived a previous COVID infection, and lowest among those who had never been infected or vaccinated, the study found.

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Nevertheless, vaccination remains the safest strategy against COVID-19, according to the report published in US Centers for Disease Control and Prevention (CDC) Morbidity and Mortality Weekly Report.

The results do not apply to the omicron variant of the virus, which now accounts for 99.5 percent of COVID-19 cases in the United States.

“The evidence in this report does not change our vaccination recommendations,” Dr. Ben Silk of the CDC and one of the study’s authors told a media briefing.

“We know that vaccination is still the safest way to protect yourself against COVID-19,” he said.

For the study, health officials in California and New York gathered data from May through November, which included the period when the delta variant was dominant.

It showed that people who survived a previous infection had lower rates of COVID-19 than people who were vaccinated alone.

That represented a change from the period when the Alpha variant was dominant, Silk told the briefing.

“Before the delta variant, COVID-19 vaccination resulted in better protection against a subsequent infection than surviving a previous infection,” he said.

In the summer and fall of 2021, however, when delta became the predominant circulating iteration of the virus in the United States, “surviving a previous infection now provided greater protection against the subsequent infection than vaccination,” he said.

But acquiring immunity through natural infection carries significant risks. According to the study, by November 30, 2021, roughly 130,781 residents of California and New York had died from COVID-19.

The analysis did not include information on the severity of initial infection, nor does it account for the full range of illness caused by prior infection.

One important limitation to the study was that it ended before administration of vaccine booster doses was widespread.

Dr. Erica Pan, state epidemiologist for the California Department of Public Health, said in an email that the study “clearly shows” that vaccines provide the safest protection against COVID-19 and they offer added protection for those with prior infections.

“Outside of this study, recent data on the highly contagious omicron variant shows that getting a booster provides significant additional protection against infection, hospitalization and death,” Pan said.

Silk said the CDC is studying the impact of vaccination, boosters and prior infection during the omicron surge and expects to issue further reports when that data becomes available.

Read more: COVID-19 pandemic ‘nowhere near over’: WHO chief

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North Korea’s fever cases under 200,000 for second day amid silence on aid offer

North Korea's daily fever cases stayed below 200,000 for a second day in a row, state media said on Monday, as Pyongyang remained silent on South Korean and US offers to help fight its first confirmed COVID-19 outbreak.

The COVID wave, declared on May 12, has fuelled concerns over a lack of vaccines, inadequate medical infrastructure and a potential food crisis in the country of 25 million.

US President Joe Biden said on Saturday that Washington had offered COVID-19 vaccines to China and North Korea, but “got no response.”

North Korea reported 167,650 new patients suffering from fever on Monday and one more death. More than 2.33 million of the 2.81 million cumulative cases reported since late April had recovered as of Sunday evening, the North's state news agency KCNA said. The official death toll stands at 68.

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While staying silent on the offer for help, North Korea has boasted of a “favorable turn” in the country's virus situation.

“The crisis and responsibility awareness is further enhanced in every region, sector, workplace and post across the country to maintain the favorable turn in the epidemic prevention work and all inroads of the epidemic are checked through the strict execution of regional and unit lockdown and blockade measures,” the KCNA said.

Such COVID-19 restrictions may be playing a role in North Korea's lack of response, a senior US administration official said Sunday.

Apparently deprived of testing supplies, North Korea has not confirmed the total number of people testing positive for the coronavirus. Instead, health authorities report the number with fever symptoms, making it difficult to assess the scale of the COVID wave, experts have said.

Authorities have distributed food and medicine across the country, with military medics deployed to help distribute drugs and conduct exams.

KCNA said pharmaceutical factories “are speeding up the production,” but did not elaborate which medicines were being produced.

Read more:

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Beijing city reports 63 new local COVID-19 cases over 24 hours

Beijing reported 63 new domestically transmitted COVID-19 infections during the 24 hours to 3 p.m. (0700 GMT) on Saturday, a disease control official at the Chinese capital said.

Of the infections, 56 were found in controlled areas and seven during community screening tests, Liu Xiaofeng, deputy director at Beijing Center for Disease Prevention and Control, told a news briefing.

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The city has recorded 1,399 COVID infections since April 22, Liu said.

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Biden says US has offered N.Korea COVID-19 vaccines but ‘got no response’

US President Joe Biden said Saturday that America had offered North Korea COVID-19 vaccines but “got no response” despite a spiraling epidemic in the isolated country.

“We've offered vaccines, not only to North Korea but to China as well and we're prepared to do that immediately," he said at a press conference in Seoul.

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“We've got no response,” he added.

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Read more:

North Korea hails ‘good results’ on COVID-19 as fever cases pass two million

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