Explainer: All you need to know about herd immunity in a viral pandemic

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onclick="open_print_popup('308165','latest');"><img src="https://web.archive.org/web/20200918015911im_/https://www.geo.tv//assets/front/images/print.svg"></a> </span> <span class="btIco btn-share--whatsapp mob"> <a target="_blank" href="https://web.archive.org/web/20200918015911/whatsapp://send/?text=Explainer: All you need to know about herd immunity in a viral pandemic https://www.geo.tv/latest/308165-explainer-reaching-herd-immunity-in-a-viral-pandemic" class=""><img src="https://web.archive.org/web/20200918015911im_/https://www.geo.tv//assets/front/images/detail-whatsapp.svg"></a> </span> </div> </div> </div> <div class="clearfix"></div> <div class="content-area"> <div class="medium-insert-images ui-sortable"><figure contenteditable="false"> <img src="https://web.archive.org/web/20200918015911im_/https://www.geo.tv/assets/uploads/updates/2020-09-16/308165_5498146_updates.jpeg" alt="" class=""> <figcaption contenteditable="true" class="" spellcheck="false">A doctor scans residents from Dharavi, one of Asia's largest slums, with an infrared thermometer to check their temperature as a precautionary measure against the spread of the coronavirus disease (COVID-19), in Mumbai, India. Photo: Reuters/File</figcaption><grammarly-extension style="position: absolute; top: 0px; left: 0px; pointer-events: none; z-index: 1;" class="_1KJtL"></grammarly-extension></figure></div><p>SYDNEY: The ongoing coronavirus pandemic has introduced us to the term "herd immunity", beaming hope that the phenomenon can help slow or even end the outbreak.</p><p>Herd immunity refers to a large portion of a community developing a degree of immunity to a virus, thereby reducing person-to-person spread. As a result, the whole community gains protection, not just those who are immune.</p><h3>Natural infection Vs Vaccination</h3><p>There are two pathways to herd immunity: natural infection or vaccination.<br></p><p>Natural infection refers to when a large number of people have had a disease and recovered. However, the extent of protection via natural infection is unknown with the new coronavirus. Moreover, more people would die while waiting for herd immunity than if a vaccine was produced.</p><p>"The risk is not acceptable," said Catherine Bennett, an epidemiology chair in the Faculty of Health at Melbourne's Deakin University. "We can't afford to have people infected to reach herd immunity when we know so little about the longer-term effects."</p><p>Vaccination can provide widespread immunity faster and more reliably.</p><p>There is no vaccine for COVID-19 - the disease caused by the novel coronavirus - though trials at different stages are underway around the world. It usually takes several years for a vaccine to be identified, tested, produced, and distributed for public use. Vaccine makers hope to dramatically compress that timeline for COVID-19 through faster trials and by manufacturing at scale even before products have proved successful.</p><p class=""><b><i><a href="https://web.archive.org/web/20200918015911/https://www.geo.tv/latest/287926-explainer-what-is-herd-immunity-and-will-it-work-in-pakistan" target="_blank">Read more: Explainer: What is herd immunity and will it work in Pakistan?</a></i></b></p><p>Experts believe if no other measures are taken, herd immunity could kick in when 50% to 70% of a population gains immunity through vaccination. The precise level depends on the vaccine's efficacy rate, which experts say will be 70% at best.</p><h3>Balancing vaccine distribution</h3><p>How a vaccine is distributed has implications for effectiveness. If shared unevenly - for example, if the wealthy have greater access than those in poorer locations - that would create safe clusters but leave large areas of susceptible people.</p><p>In the early stages of distribution, a higher priority may be given to healthcare workers and others on front lines, or those considered most vulnerable - a process known as targeted vaccination. That risks missing people who might be considered "super-spreaders", such as public transport workers.</p><p>"We need to be sure that we spread the vaccine equitably through the population," said Joel Miller, a senior lecturer in applied mathematics at La Trobe University in Melbourne, who uses mathematical models to help governments and non-profit organisations formulate policies to control infectious diseases.</p><h3>Movement restrictions</h3><p>The movement of people also has implications for the spread of a virus.<br></p><p>At lower vaccination levels, the number of people who eventually become infected is similar in a group of people who mix and travel widely, and a group of people who are relatively static. However, the spread is much slower in a static population, hence governments worldwide imposing lockdown measures.</p><p>Even when a high percentage of the population is vaccinated, infection numbers can be reduced further if people refrain from travel.</p><h3>While we wait</h3><p>The new coronavirus is spread primarily via droplets expelled when a person coughs, sneezes, or even talks.</p><p>Until a vaccine is developed, wearing masks, physical distancing and hand hygiene can help reduce transmission and contribute to creating herd immunity.</p><p>Epidemiologists largely agree that a combined approach is critical given early vaccines brought to the market will likely not have 100% efficacy.</p><p>"It's about adding layers," said Deakin University's Bennett. "It gives us extra protection from community spread. 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