Opinion: The danger of a giant Covid belly flop - CNN - 0 views
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As more and more vaccinations are administered in the US, the Covid-19 story, which once was nothing more than a tale of enormous tragedy, now has a new plotline: how best to return to normal.
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transmission of a virus depends on a non-immune person bumping into an actively infected person. With more and more vaccination, the likelihood that a non-immune person will come in contact with an infected person is progressively reduced until -- poof -- the risk of catching the infection is almost gone (though never zero).
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The issue in 1918, when the first article describing herd immunity was published, was the threat of epidemic miscarriage due to a bacterium among pregnant cows in Kansas.
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Consider a calculation to determine the threshold for herd immunity: Vc=(1− 1/R0)/E. "Vc" is the proportion of people who must be vaccinated to protect the rest of the herd, "R0," pronounced R-naught, is an estimate of the number of secondary cases from the original infected person and "E" represents effectiveness of a given vaccine against transmission. And this, which resembles a brutal SAT math section entry, is the dumbed-down version.
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This is not a fund-raiser with a fixed universal goal we all are striving to reach. The above equation evaluates the nation as a homogenized entity, but people live in communities
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Though, of course, the fix -- culling -- is not an option for human disease, the benefit of an immune herd is self evident.
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Fast forward to the 21st century world of vaccines. Pandemics and health care are decidedly more complex, which has led all to wonder: what is the magic number of people we need to vaccinate so we can all forget these disastrous last 14 months?close dialogOur free Provoke/Persuade newsletter compiles the week’s most thought-provoking pieces and delivers them straight to your inbox. Please enter aboveSign me upBy subscribing you agree to ourprivacy policy.Thanks for Subscribing!Continue ReadingBy subscribing you agree to ourprivacy policy.close dialog/* effects for .bx-campaign-1295603 *//* custom css .bx-campaign-1295603 *//* custom css from creative 52220 */.bxc.bx-custom.bx-campaign-1295603 .bx-row-image-logo img { height: 42px;}@media screen and (max-width:736px) { .bxc.bx-custom.bx-campaign-1295603 .bx-row-image-logo img { height: 35px;}}/*Validation border*/.bxc.bx-custom.bx-campaign-1295603 .bx-row-validation .bx-input { border-color: #B50000; /*Specify border color*/ border-width: 1px; box-shadow: none; background-color: transparent; color: #B50000; /*Specify text color*/}/* rendered styles .bx-campaign-1295603 */.bxc.bx-campaign-1295603.bx-active-step-1 .bx-creative:before {min-height: 220px;}.bxc.bx-campaign-1295603.bx-active-step-1 .bx-creative {border-color: #c1c1c1;border-style: solid;background-size: contain;background-color: white;border-width: 1px 0;border-radius: 0;}@media all and (max-width: 736px) {.bxc.bx-campaign-1295603.bx-active-step-1 .bx-creative:before {min-height: 200px;}}.bxc.bx-campaign-1295603.bx-active-step-1 .bx-creative> *:first-child {width: 780px;vertical-align: middle;padding: 10px;}@media all and (max-width: 736px) {.bxc.bx-campaign-1295603.bx-active-step-1 .bx-creative> *:first-child {width: 340px;padding: 20px;}}.bxc.bx-campaign-1295603.bx-active-step-1 .bx-close {stroke: rgb(193, 193, 193);stroke-width: 2px;width: 24px;height: 24px;}@media all and (max-width: 736px) {.bxc.bx-campaign-1295603.bx-active-step-1 .bx-close {width: 30px;height: 30px;padding: 0 0 10px 10px;}}.bxc.bx-campaign-1295603 .bx-group-1295603-y4M7jyO {width: 660px;text-align: left;}@media all and (max-width: 736px) {.bxc.bx-campaign-1295603 .bx-group-1295603-y4M7jyO {text-align: center;width: 315px;}}.bxc.bx-campaign-1295603 .bx-element-1295603-tVcUlRZ {padding: 0;width: auto;}.bxc.bx-campaign-1295603 .bx-element-1295603-tVcUlRZ> *:first-child {background-color: transparent;background-size: contain;}.bxc.bx-campaign-1295603 .bx-group-1295603-BpRQ7DR {width: 660px;text-align: left;padding: 25px 0 15px;}@media all and (max-width: 736px) {.bxc.bx-campaign-1295603 .bx-group-1295603-BpRQ7DR {width: 310px;padding: 15px 0 15px;text-align: center;}}.bxc.bx-campaign-1295603 .bx-element-1295603-oUX5Jvf {width: 100%;}@media all and (max-width: 736px) {.bxc.bx-campaign-1295603 .bx-element-1295603-oUX5Jvf {width: auto;}}.bxc.bx-campaign-1295603 .bx-element-1295603-oUX5Jvf> *:first-child {font-family: CNN Business,CNN,Helvetica Neue,Helvetica,Arial,Utkal,sans-serif;font-weight: 400;font-size: 24px;line-height: 1.1em;}@media all and (max-width: 736px) {.bxc.bx-campaign-1295603 .bx-element-1295603-oUX5Jvf> *:first-child {font-size: 16px;padding: 6px 0 0;line-height: 1.2;}}.bxc.bx-campaign-1295603 .bx-group-1295603-PZ8dLrW {width: 660px;padding: 0;min-width: 550px;text-align: left;}@media all and (max-width: 736px) {.bxc.bx-campaign-1295603 .bx-group-1295603-PZ8dLrW {min-width: auto;width: 310px;padding: 0;}}@media all and (min-wi
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Lessening the threat of fetal loss therefore was straightforward: farmers should "retain" immune cattle -- those who had already had a spontaneous abortion -- and not waste "material, time, and energy ... on animals of doubtful value." Rather, they advised to butcher the non-immune cows and concentrate on the immune, "profitable" ones.
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A famous mumps outbreak in adolescent boys from the Orthodox Jewish community is thought to have been exacerbated by the school practice of promoting close, sustained (15 hours a day) contact with a study partner ("chavrusa") including "animated" face-to-face discussion resulting in transmission despite the fact that most had been vaccinated years before.
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Stated more simply, the herd likely is protected at a very different percent of vaccinated people in an Orthodox Jewish community in San Diego where people live near the school and walk to most activities compared to a gated community in a Minneapolis suburb where many prefer to keep to themselves.
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We have received a master class in viral variants in recent months, witnessing day by day the alarming uptick in new cases as the B.1.1.7. variant has been introduced to new communities. But a single R-naught cannot fit all variants of Covid-19; a community with higher rates of B.1.1.7. and, therefore, a higher R-naught will require, among other things, a higher level of vaccination to designate the herd as sufficiently immune.
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This is extremely important to keep in mind in the weeks and months ahead as we continue to vaccinate and wait and vaccinate and wait, chasing a number that is fundamentally misleading.
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The heterogeneity of human behavior, geography and the virus itself explains the vagueness of the pronouncements of Dr. Anthony Fauci, the chief medical adviser to President Joe Biden, and other experts as they seek to evade specifying just how many more people need vaccination before we officially can claim victory.
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As we have seen in the US during the 15-month arc of the pandemic, trust in science and scientists has been the key to progress. Masks work. Vaccines work. Certain medications work.