As Delta Air Lines continued to spread across the country, Australia had 13 Covid outbreaks in three months.
The virus is more infectious than the testing and tracking procedures previously used to control cases in states such as New South Wales, forcing every jurisdiction except Tasmania and the Australian Capital Territory to be at some point in time. Blocked state.
Professor Nancy Baxter, a clinical epidemiologist at the University of Melbourne, said that Delta virus is five times more infectious than the original Wuhan virus strain, which makes it difficult to control.
Delta Air Lines has also exposed the weakness of Australian hotel quarantine. There have been several violations in Queensland in recent weeks, although Halved the number of overseas arrivals.
The continued high number of cases in New South Wales has caused some experts to worry that the state has lost the opportunity to reduce the number of cases to zero. Greater Sydney may need Blocked until christmas.
However, New South Wales Governor Gladys Berejiklian (Gladys Berejiklian) pinned his hopes on vaccination, saying that if the vaccination rate for adults over 16 years old reaches 50%, the city may be released on August 28. To get rid of the current blockade.
So far, approximately 19% of people have been fully vaccinated.
The infectivity of the Delta variant has been described as a “game changer” in pandemic management, which means that vaccination is increasingly seen as the key to lifting the lockdown.
However, data leaked in the United States indicates the limitations of vaccination and measures including wearing masks may need to continue until a higher immunization rate is achieved.
Approximately 70% of adults in the United States have now been vaccinated (about 50% of the total population), but the virus has made a comeback in recent weeks, which is blamed on Delta Air Lines.
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Leaked Centers for Disease Control and Prevention (CDC) slide presentation, by Washington post, Which shows that Delta is as easy to spread as chickenpox and more easily Than the common cold or Ebola.
Compared with the earlier variants, it also seems to cause more serious illnesses, worrying that officials must “acknowledge that the war has changed.”
After the report was released, the CDC again recommended wearing masks in high-risk areas, even for people who have been vaccinated.
However, American scientist Anthony Fauci said that despite the recent surge in cases, the United States is unlikely to re-enter the lockdown, although he pointed out that the United States “will face some pain and suffering in the future.”
We won’t be able to do whatever we want
Professor Baxter said that the CDC’s findings indicate that once 50% of the population is vaccinated, Australians cannot do whatever they want.
“You can’t think that vaccination is the only barrier between us and freedom,” she said.
There was news last week that once 70% of adults are vaccinated, Australia’s blockade will begin to be gradually lifted and more freedom will be given. Once 80% are vaccinated.
If children are included, this is equivalent to 56% and 64% of Australia’s total population.
Professor Baxter said that compared with previous strains, vaccination is highly protective against serious diseases and hospitalizations, but it is not effective in preventing someone from contracting Delta.
She said that one of the most important findings in the CDC file is the data showing that if someone does get Delta, they seem to be just as infectious as someone who has not been vaccinated.
Professor Baxter said: “If you are infected with it, it will be more contagious and more deadly.”
“People who are vaccinated may get a mild disease, but they are contagious and can definitely spread it.”
The CDC’s slides also show that breakthrough infections among vaccinated people are not as rare as previously thought. “Among the 162 million vaccinated Americans, there are approximately 35,000 symptomatic infections every week.” .
A review of survey results in other countries shows that although the original Covid strain is as contagious as the common cold, every person with Delta will infect an average of 8 people, making it as contagious as chickenpox, but still less than measles.
Reports from Canada and Scotland also indicate that Delta may be more serious and have a higher chance of being hospitalized. In Singapore, it has also increased the chance of admission to the ICU and death.
Although data on vaccine efficacy varies from country to country, the CDC estimates that after vaccination, the effective rate for serious illness and death is 90%, and the effective rate for infection is at least 67%.
‘It’s far from over’
One of the super-spread incidents that shocked the authorities the most was the outbreak in one of the most vaccinated towns in the country.
More than 95% of the permanent residents of Provincetown were vaccinated, but it still triggered a large-scale outbreak involving 900 cases.
It is believed that on the weekend of July 4th, a large number of tourists flocked to tourist towns in Massachusetts to gather at clubs and family gatherings to restore their pre-Covid lives, and the epidemic broke out.
But a few weeks later, the town is struggling to deal with a serious epidemic, in which about 200 permanent residents have tested positive.
The CDC’s preliminary report on the outbreak on Friday stated that approximately three-quarters of the population had been vaccinated.
Susan Peskin, a Provincetown resident, said: “It is clear now, as clear as during the day, that you can get the vaccine and still get Covid.” New York Times.
“The most important thing is that we must really pay attention to ourselves and don’t think that everything is over. It’s far from over.”
The more positive news is that vaccination does seem to prevent people from getting seriously ill. Only 7 people have been hospitalized and no deaths have been reported.
Professor Celine Gund, an infectious disease doctor at New York University, said this is part of the reason why the CDC changed its guidelines.
“This is not for your own protection-as a vaccinated person, if you have one of these breakthrough infections, you may have mild symptoms, you may have no symptoms, but based on what we see here, You may infect other people,” she told AFP.
— Agence France-Presse