New research result that 'immunity of new coronavirus lasts only a few weeks'
In some patients with novel coronavirus infection (COVID-19), antibodies to the virus disappeared in just a few weeks, suggesting that whole population immunity to novel coronavirus may be 'unachievable' Has been published.
Prevalence of SARS-CoV-2 in Spain (ENE-COVID): a nationwide, population-based seroepidemiological study-The Lancet
Spain's coronavirus antibodies study adds evidence against herd immunity-CNN
https://edition.cnn.com/2020/07/06/health/spain-coronavirus-antibody-study-lancet-intl/index.html
This report is based on a large survey conducted in Spain. In the survey, from April 27 to May 11, 2020, we responded to a questionnaire about 61,075 randomly selected participants regarding the history and symptoms of COVID-19, and then the new coronavirus A seroprevalence of IgG antibodies was investigated. This survey, which targets more than 60,000 people, is said to be the largest ever.
The focus of this study is on the effectiveness of collective immunity against the novel coronavirus. Collective immunity means that the spread of the virus can be stopped by increasing the number of people who have immunity in the community. To do. In order to prevent new infections, it is important that 70 to 90% of the community have antibodies to obtain immunity.
However, research revealed that only about 5% of the population had antibodies to the new coronavirus. According to the research team, the majority of Spaniards had many negative blood antibody responses to the novel coronavirus, especially in areas with high COVID-19 prevalence.
They also found that 14% of people previously diagnosed with the antibody had gone undetected in the second test. In other words, even if you become infected and acquire immunity to the new coronavirus, the antibody may be lost in the weeks to months.
The report said: 'The relatively low antibody prevalence observed in the context of the Spanish pandemic may serve as a reference to other countries. Collective immunity causes a large number of deaths in susceptible populations. It is difficult and unrealistic to achieve without the collateral damage and overburden of the health system.'
``From this study, the approach of achieving population immunity through natural infection is extremely unethical,'' said Isabella Ecker, director of the Center for Emerging Viral Diseases in Geneva and Benjamin Meyer, a virologist at the University of Geneva. Not only that, but it is also unattainable.” He also points out that there is a possibility that the infection will explode again because we cannot expect collective immunity.
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