Herd immunity and covid-19

By Dr. Stephen A. Berger WHAT IS HERD IMMUNITY? It stands to reason that a contagious disease should disappear from a population when a sufficient percentage of potential victims – “the herd” has become immune. This outcome may arise because a massive number of individuals have been either infected or vaccinated. Most authorities dealing with COVID-19 have set the goal for herd immunity at>60 percent; however, the precise percentage for any infectious disease will depend on many factors involving demography, virulence, route of infection, etc.    HAS AN INFECTIOUS DISEASE EVER BEEN ERADICATED BY REACHING HERD IMMUNITY? Infectious Diseases have been known to reach herd immunity, however, none have been permanently eradicated by it. For instance, although there was an observed decrease of measles infections during the 1930s, recent outbreaks indicate the disease is far from being eliminated – despite effective vaccination measures introduced in 1963.   IMPORTANT CONSIDERATIONS As many countries enter into a second-wave of this pandemic, the bottom-line question for those who advocate the achievement of herd immunity through mass infection of the population will be one of cost-benefit.  This prompts a few thoughts and questions. Any program to actively infect large numbers of individuals will begin with the isolation of the elderly and other high-risk populations. How many countries are truly equipped to house, feed, isolate, and t...
Source: GIDEON blog - Category: Databases & Libraries Authors: Tags: Epidemiology Examples News Source Type: blogs

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One Monday in late February 2020, Lauren Gardner was working frantically. The website she’d been managing around the clock for the last month—which tracked cases of an emerging respiratory disease called COVID-19, and presented the spread in maps and charts—was, all of a sudden, getting inundated with visitors and kept crashing. As Gardner, an associate professor of engineering at Johns Hopkins University (JHU), struggled to get the site online again, an official in the Trump Administration falsely claimed on Twitter that JHU had deliberately censored the information. “Seems like bad timing to sto...
Source: TIME: Health - Category: Consumer Health News Authors: Tags: Uncategorized COVID-19 healthscienceclimate Source Type: news
Getting the kids ready to go back to school each fall is stressful enough in a normal year, never mind in the midst of a pandemic. Between the more transmissible Delta coronavirus variant, rising cases across the country and new masking guidance from the U.S. Centers for Disease Control and Prevention (CDC), there’s a lot for parents to navigate as they plan for schools to reopen this August and September. On the whole, experts seem to agree it’s time to get kids back into their classrooms. Remote learning set many children—especially students of color—back academically, cut them off from essential ...
Source: TIME: Health - Category: Consumer Health News Authors: Tags: Uncategorized COVID-19 Source Type: news
2021 got off to a grim pandemic start in the U.S. A huge surge in COVID-19 cases followed the holiday season, peaking at around 300,000 new cases on Jan. 8, 2020. More than 20,000 Americans lost their lives to the virus in a single week in January alone and over 146,00 in total have died since the start of the year. But six weeks later, the picture looks more promising. New daily cases have fallen sharply, daily deaths have fallen to levels not seen since Thanksgiving, and the pace of vaccine roll-out is speeding up. These positive trends mean that we can now begin to ask what the endgame might look like. Would we be happy...
Source: TIME: Health - Category: Consumer Health News Authors: Tags: Uncategorized COVID-19 Source Type: news
When does a pandemic end? Is it when life regains a semblance of normality? Is it when the world reaches herd immunity, the benchmark at which enough people are immune to an infectious disease to stop its widespread circulation? Or is it when the disease is defeated, the last patient cured and the pathogen retired to the history books? The last scenario, in the case of COVID-19, is likely a ways off, if it ever arrives. The virus has infected more than 100 million people worldwide and killed more than 2 million. New viral variants even more contagious than those that started the pandemic are spreading across the world. And...
Source: TIME: Health - Category: Consumer Health News Authors: Tags: Uncategorized Cover Story COVID-19 feature Magazine Source Type: news
This article is republished from The Conversation under a Creative Commons license. Read the original article. The post What Developing Countries Can Teach Us About How To Respond To a Pandemic appeared first on Inter Press Service.
Source: IPS Inter Press Service - Health - Category: International Medicine & Public Health Authors: Tags: Global Headlines Health TerraViva United Nations Source Type: news
By MICHEL ACCAD, MD With cases of COVID-19 either disappeared or rapidly diminishing from places like Wuhan, Italy, New York, and Sweden, many voices are speculating that herd immunity may have been reached in those areas and that it may be at hand in the remaining parts of the world that are still struggling with the pandemic.  Lockdowns should end—or may not have been needed to begin with, they conclude. Adding plausibility to their speculation is the discovery of biological evidence suggesting that prior exposure to other coronaviruses may confer some degree of immunity against SARS-CoV...
Source: The Health Care Blog - Category: Consumer Health News Authors: Tags: COVID-19 Health Policy immunity MICHEL ACCAD Pandemic Source Type: blogs
At long last, we have made a truly game-changing scientific breakthrough in preventing the spread of COVID-19. The impact of this breakthrough seems almost too good to be true. We have found a disease control tool that, when used properly, can dramatically reduce the person-to-person transmission of SARS-CoV-2, the virus that causes COVID-19. Studies have shown that this tool could reduce transmission by somewhere between 50% and 85%. The tool is cheap and remarkably low-tech. You can even make one at home. It has no significant side effects. And with each passing day, the scientific research showing the tool’s effec...
Source: TIME: Health - Category: Consumer Health News Authors: Tags: Uncategorized COVID-19 Source Type: news
A young boy in Pakistan receives an oral polio vaccine (OPV). Credit: Ashfaq Yusufzai/IPSBy Laura MackenzieMay 6 2020 (IPS) Interruptions to vaccination programmes caused by the COVID-19 pandemic could result in new waves of measles or polio outbreaks, health experts warn. A growing number of one-off immunisation campaigns and national routine vaccine introductions are being delayed amid social distancing and other measures to curb the spread of SARS-CoV-2, leaving millions unprotected. With both preventive campaigns and routine immunisations impacted, “we’ll have an increasing number of children who will becom...
Source: IPS Inter Press Service - Health - Category: International Medicine & Public Health Authors: Tags: Global Headlines Health TerraViva United Nations Source Type: news
This article originally appeared on The Bulwark here. The post The False Choice Between Science And Economics appeared first on The Health Care Blog.
Source: The Health Care Blog - Category: Consumer Health News Authors: Tags: COVID-19 Health Policy David Shaywitz Source Type: blogs
In early April, about four months after a new, highly infectious coronavirus was first identified in China, an international group of scientists reported encouraging results from a study of an experimental drug for treating the viral disease known as COVID-19. It was a small study, reported in the New England Journal of Medicine, but showed that remdesivir, an unapproved drug that was originally developed to fight Ebola, helped 68% of patients with severe breathing problems due to COVID-19 to improve; 60% of those who relied on a ventilator to breathe and took the drug were able to wean themselves off the machines after 18...
Source: TIME: Health - Category: Consumer Health News Authors: Tags: Uncategorized COVID-19 Source Type: news
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