o0oBiRaiNo0o
The Warrior of Light
- 1/9/07
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Nhóm chuyên gia vắc xin Oxford (Anh) cho rằng biến thể Delta đã phá hủy cái gọi là "Miễn dịch cộng đồng" và họ cho rằng vương quốc Anh nên dừng việc xét nghiệm nhanh toàn dân, tiến tới sống chung với dịch bệnh. Phát biểu này được nhóm vắc xin Oxford đưa ra sau khi bà Angela Merkel, nguyên thủ quốc gia đầu tiên trong nhóm G7 tuyên bố Đức sẽ là nơi đầu tiên ngưng xét nghiệm miễn phí, bắt đầu từ ngày 11/10 năm nay.
Giáo sư Sir Andrew Pollard, người đứng đầu nhóm chuyên gia vắc xin Oxford (Oxford vaccine team) cho rằng loài người nên chấp nhận việc không thể ngăn chặn dịch bệnh lây lan trong cộng đồng và việc theo dõi những người nhiễm bệnh triệu chứng nhẹ không còn hiệu quả nữa. Ông nói rằng biến thể Delta có thể lây nhiễm sang những người đã tiêm chủng đầy đủ (2 mũi), khiến cho cơ hội tạo miễn dịch cộng đồng không còn khả thi nữa.
Bộ Y tế Anh cho biết đã có hơn 3/4 người trưởng thành ở nước này (bao gồm Bắc Ireland) đã được tiêm ngừa đầy đủ 2 mũi, con số cụ thể là 89% đã được tiêm vaccine Covid19, trong đó có 75% được tiêm 2 mũi. Họ xác nhận chiến dịch tiêm chủng đã giúp ngăn ngừa 60.000 người khỏi bị tử vong và 66.900 ca nhập viện vì Covid19.
Phát biểu trước Nghị viện, Sir Andrew Pollard nói: "Những ai chưa tiêm chủng, một lúc nào đó sẽ bị nhiễm virus. Chúng ta không có bất kỳ thứ gì ngăn chặn được sự lây nhiễm, do đó tôi cho rằng chúng ta đang ở tình huống không thể đạt được miễn dịch cộng đồng, thậm chí tôi nghĩ rằng virus sẽ tiến hóa ra thêm biến thể mới lây lan được trên cả những người đã tiêm đủ 2 mũi."
Từ trước tới nay, UK nói riêng và toàn thế giới nói chung đang cố gắng đẩy mạnh tiêm chủng toàn dân để tạo miễn dịch cộng đồng. Chỉ mới cách đây đúng 1 tuần, ngày 4/8 Ủy ban Tiêm chủng và vaccine UK cho biết họ sẽ tiêm ngừa cho thiếu niên 16-17 tuổi để ngăn ngừa đợt bùng dịch Covid19 mùa Đông 2021.
Sau đó 2 hôm, ngày 6/8 Ủy ban Y tế Cộng đồng Anh (PHE) công bố phân tích cho thấy người đã tiêm ngừa vắc xin vẫn có tải lượng virus tương đương với người chưa chích ngừa nếu bị nhiễm biến thể Delta, do đó vẫn có khả năng bị nhiễm bệnh và lây lan cho người khác.
Paul Hunter, giáo sư Y khoa chuyên ngành bệnh truyền nhiễm ở ĐH Đông Anglia (Norwich, UK) phát biểu: "Khái niệm miễn dịch cộng đồng không thể đạt được bởi vì virus sẽ lây nhiễm ở những người chưa được tiêm ngừa và số liệu mới nhất cho thấy tiêm đủ 2 mũi chỉ giúp ngừa được 50% nguy cơ bị lây bệnh mà thôi." Giáo sư Paul còn là 1 mắt xích trong ban tư vấn Covid19 của WHO, ông nói rằng đã đến lúc cần phải thay đổi cách thu thập dữ liệu về virus và xem đây là một bệnh tương tự như cúm mùa (xảy ra hàng năm).
Hôm qua, Bộ trưởng Y tế Sajid Javid xác nhận UK sẽ tiêm nhắc mũi thứ 3 từ tháng 9/21 để tăng hiệu quả ngừa bệnh. Trong khi đó, Sir Andrew Pollard cho biết nếu UK không ngừng việc xét nghiệm toàn dân thì sẽ phải liên tục tiêm chủng cho người dân.
Ông nói: "Tôi nghĩ là khi chúng ta nhìn vào dân số (trẻ) thành người lớn, nếu cứ tiếp tục xét nghiệm trong cộng đồng để rồi lo lắng vì con số dương tính, chúng ta sẽ mắc kẹt trong một tình huống đuổi bắt không lối thoát. Cần phải chuyển hướng qua xét nghiệm lâm sàn đối với những người trẻ tự nguyện đến xét nghiệm, theo dõi và điều trị, hơn là xét nghiệm toàn dân. Nếu có cháu nào không khỏe, họ nên được xét nghiệm, để an toàn cho những người xung quanh, còn nếu các cháu khỏe, các cháu phải được đến trường và đi học."
Theo Telegraph
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There is no way of stopping Covid spreading through the entire population, experts tell MPs as they call for end of mass testing
Scientists have called for an end to mass testing so Britain can start to live with Covid CREDIT: Jason Alden/ Bloomberg
The delta variant has wrecked any chance of herd immunity, a panel of experts including the head of the Oxford vaccine team said as they called for an end to mass testing so Britain can start to live with Covid.
Scientists said it was time to accept that there was no way of stopping the virus spreading through the entire population, and monitoring people with mild symptoms was no longer helpful.
Prof Andrew Pollard, who led the Oxford vaccine team, said it was clear that the delta variant could infect people who had been vaccinated, which made herd immunity impossible to reach even with high vaccine uptake.
It comes as Angela Merkel became the first major world leader to announce the end of free testing, with the provision set to stop in Germany from Oct 11.
On Tuesday, the Department of Health confirmed that more than three quarters of adults have now received both jabs, and calculated that 60,000 deaths and 66,900 hospitalisations had been prevented by vaccination. But experts said it would never be enough to stop Covid from spreading.
Speaking to the all-party parliamentary group on Covid, Sir Andrew said: "Anyone who is still unvaccinated will, at some point, meet the virus.
"We don't have anything that will stop transmission, so I think we are in a situation where herd immunity is not a possibility and I suspect the virus will throw up a new variant that is even better at infecting vaccinated individuals."
Until recently, it was hoped that increasing the number of Britons jabbed would create a ring of protection around the population. As late as last week, the Joint Committee on Vaccination and Immunisation said one of the reasons it had advised that 16 and 17-year-olds should be vaccinated was because it may help prevent a winter Covid wave.
However, analysis by Public Health England has shown that when vaccinated people catch the virus they have a similar viral load to unvaccinated individuals and may be as infectious.
Paul Hunter, professor in medicine at the University of East Anglia and an expert in infectious diseases, told the committee: "The concept of herd immunity is unachievable because we know the infection will spread in unvaccinated populations and the latest data is suggesting that two doses is probably only 50 percent protective against infection."
Prof Hunter, who advises the World Health Organisation on Covid, also said it was time to change the way the data was collected and recorded as the virus became endemic.
"We need to start moving away from just reporting infections, or just reporting positive cases admitted to hospital, to actually start reporting the number of people who are ill because of Covid," he added. "Otherwise we are going to be frightening ourselves with very high numbers that actually don't translate into disease burden."
On Tuesday, Sajid Javid, the Health Secretary, confirmed that third dose booster shots would be given from next month. However, Sir Andrew argued that, if mass testing was not stopped, Britain could be in a situation of continually vaccinating the population.
"I think as we look at the adult population going forward, if we continue to chase community testing and are worried about those results, we're going to end up in a situation where we're constantly boosting to try and deal with something which is not manageable," he said.
"It needs to be moving to clinically driven testing in which people are willing to get tested and treated and managed, rather than lots of community testing. If someone is unwell they should be tested, but for their contacts, if they're not unwell then it makes sense for them to be in school and being educated."
Dr Ruchi Sinha, consultant paediatrician at Imperial College Healthcare NHS Trust, told MPs and peers that choosing not to vaccinate children would be unlikely to cause problems in the health service.
"What matters is the burden of patient hospitalisation and critical care and actually there hasn't been as much with this delta variant," she said. "They tend to be the children who have got their comorbidities, obesity, or severe neurological problems and those children are already considered for vaccination. Covid on its own in paediatrics is not the problem."
Scientists have called for an end to mass testing so Britain can start to live with Covid CREDIT: Jason Alden/ Bloomberg
The delta variant has wrecked any chance of herd immunity, a panel of experts including the head of the Oxford vaccine team said as they called for an end to mass testing so Britain can start to live with Covid.
Scientists said it was time to accept that there was no way of stopping the virus spreading through the entire population, and monitoring people with mild symptoms was no longer helpful.
Prof Andrew Pollard, who led the Oxford vaccine team, said it was clear that the delta variant could infect people who had been vaccinated, which made herd immunity impossible to reach even with high vaccine uptake.
It comes as Angela Merkel became the first major world leader to announce the end of free testing, with the provision set to stop in Germany from Oct 11.
On Tuesday, the Department of Health confirmed that more than three quarters of adults have now received both jabs, and calculated that 60,000 deaths and 66,900 hospitalisations had been prevented by vaccination. But experts said it would never be enough to stop Covid from spreading.
Speaking to the all-party parliamentary group on Covid, Sir Andrew said: "Anyone who is still unvaccinated will, at some point, meet the virus.
"We don't have anything that will stop transmission, so I think we are in a situation where herd immunity is not a possibility and I suspect the virus will throw up a new variant that is even better at infecting vaccinated individuals."
Until recently, it was hoped that increasing the number of Britons jabbed would create a ring of protection around the population. As late as last week, the Joint Committee on Vaccination and Immunisation said one of the reasons it had advised that 16 and 17-year-olds should be vaccinated was because it may help prevent a winter Covid wave.
However, analysis by Public Health England has shown that when vaccinated people catch the virus they have a similar viral load to unvaccinated individuals and may be as infectious.
Paul Hunter, professor in medicine at the University of East Anglia and an expert in infectious diseases, told the committee: "The concept of herd immunity is unachievable because we know the infection will spread in unvaccinated populations and the latest data is suggesting that two doses is probably only 50 percent protective against infection."
Prof Hunter, who advises the World Health Organisation on Covid, also said it was time to change the way the data was collected and recorded as the virus became endemic.
"We need to start moving away from just reporting infections, or just reporting positive cases admitted to hospital, to actually start reporting the number of people who are ill because of Covid," he added. "Otherwise we are going to be frightening ourselves with very high numbers that actually don't translate into disease burden."
On Tuesday, Sajid Javid, the Health Secretary, confirmed that third dose booster shots would be given from next month. However, Sir Andrew argued that, if mass testing was not stopped, Britain could be in a situation of continually vaccinating the population.
"I think as we look at the adult population going forward, if we continue to chase community testing and are worried about those results, we're going to end up in a situation where we're constantly boosting to try and deal with something which is not manageable," he said.
"It needs to be moving to clinically driven testing in which people are willing to get tested and treated and managed, rather than lots of community testing. If someone is unwell they should be tested, but for their contacts, if they're not unwell then it makes sense for them to be in school and being educated."
Dr Ruchi Sinha, consultant paediatrician at Imperial College Healthcare NHS Trust, told MPs and peers that choosing not to vaccinate children would be unlikely to cause problems in the health service.
"What matters is the burden of patient hospitalisation and critical care and actually there hasn't been as much with this delta variant," she said. "They tend to be the children who have got their comorbidities, obesity, or severe neurological problems and those children are already considered for vaccination. Covid on its own in paediatrics is not the problem."
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