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Source: COVID-19 Herd Immunity  Sep 23, 2020  2 months ago
COVID-19 Herd Immunity Is Impractical And Disastrous According To New Study Plus Emerging Studies Indicate Immunity Is Short-Lived
COVID-19 Herd Immunity Is Impractical And Disastrous According To New Study Plus Emerging Studies Indicate Immunity Is Short-Lived
Source: COVID-19 Herd Immunity  Sep 23, 2020  2 months ago
COVID-19 Herd Immunity: Researchers from University of Georgia have developed a new model that proves that achieving herd immunity to COVID-19 is an impractical public health strategy.


 
The study findings were published in the journal:  Proceedings of the National Academy of Sciences. https://www.pnas.org/content/early/2020/09/21/2008087117
 
Currently attempts to controlling COVID-19 have presented public health policymakers with a conundrum ie how to prevent overwhelming their health care infrastructure, while avoiding major societal disruption?
 
To date government and public debate has revolved around two proposed strategies. One school of thought aims for "suppression," eliminating transmission in communities through drastic social distancing measures, while another strategy is "mitigation," aiming to achieve herd immunity by permitting the infection of a sufficiently large proportion of the population while not exceeding health care capacity.
 
Dr Toby Brett, a postdoctoral associate at the Odum School of Ecology and the study's lead author told Thailand Medical News, "The herd immunity concept is tantalizing because it spells the end of the threat of COVID-19.However, because this approach aims to avoid disease elimination, it would need a constant adjustment of lockdown measures to ensure enough but not too many individuals are being infected at a particular point in time. Because of these challenges, the herd immunity strategy is actually more like attempting to walk a barely visible tightrope."
 
The research was carried out by Dr Brett and Dr Pejman Rohani at the University of Georgia's Center for the Ecology of Infectious Diseases, investigates the suppression and mitigation approaches for controlling the spread of SARS-CoV-2, the virus that causes COVID-19.
 
Although recent research  have explored the impacts of both suppression and mitigation strategies in several countries, Dr Brett and Dr Rohani sought to determine if and how countries could achieve herd immunity without overburdening the health care system, and to define the control efforts that would be required to do so.
 
The study team  developed an age-stratified disease transmission model to simulate SARS-CoV-2 transmission in the United Kingdom, with spread controlled by the self-isolation of symptomatic individuals and various levels of social distancing.
 
The study team’s simulations found that in the absence of any control measures, the U.K. would experience as many as 410,000 deaths related to COVID-19, with 350,000 of those being from individuals aged 60-plus.
 
The team also found that using the suppression strategy, far fewer fatalities were predicted: 62,000 among individuals aged 60-plus and 43,000 among individuals under 60.
 
The study found that if self-isolation engagement is high (defined as at least 70% reduction in transmission), suppression can be achieved in two months regardless of social distancing measures, and potentially sooner should school, work and social gathering places close.
 
/> Upon examining strategies that seek to build herd immunity through mitigation, the team’s model found that if social distancing is maintained at a fixed level, hospital capacity would need to greatly increase to prevent the health care system from being overwhelmed.
 
It was found that to instead achieve herd immunity given currently available hospital resources, the U.K. would need to adjust levels of social distancing in real time to ensure that the number of sick individuals is equal to, but not beyond, hospital capacity. If the virus spreads too quickly, hospitals will be overwhelmed, but if it spreads too slowly, the epidemic will be suppressed without achieving herd immunity.
 
Dr Brett and Dr Rohani further noted that much is unknown about the nature, duration and effectiveness of COVID-19 immunity, and that their model assumes perfect long-lasting immunity. They cautioned that if immunity is not perfect, and there is a significant chance of reinfection, achieving herd immunity through widespread exposure is very unlikely.
 
Dr Rohani added, "We recognize there remains much for us to learn about COVID-19 transmission and immunity, but believe that such modeling can be invaluable in so-called 'situational analyses. Models allow stakeholders to think through the consequences of alternative courses of action."
 
On a separate note without anything to do with the study findings, there is already a growing number of documented reinfection cases emerging and more studies showing that COVID-19 immunity is short lived with newer studies showing that it is even less than 60 days in most cases. https://www.thailandmedical.news/news/coronavirus-latest-experts-concerned-as-reinfections-occurring-in-shorter-intervals,-also-new-study-shows-antibodies-in-infected-diminish-in-about-60-
 
Furthermore there is already growing consensus that even the current COVID-19 vaccines being developed or in use already will be futile in controlling the COVID-19, hence the herd immunity hypothesis for COVID-19 is basically unsubstantiated.
 
For more on COVID-19 Herd Immunity, keep on logging to Thailand Medical News.
 

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