WHY YOUR VACCINATIONS HELP OTHERS? : Herd Immunity!
What is herd immunity?
Herd immunity is the idea that if enough people get immunized against a disease, they’ll create protection for even those who aren’t vaccinated. This is important to protect those who can’t get vaccinated, like immunocompromised children.
You can see in the image, low levels of vaccination lead to everyone getting infected. Medium levels slow down the progression of the illness, but they don’t offer robust protection to the unvaccinated. But once you read a high enough level of vaccination, the disease gets effectively road-blocked. It can’t spread fast enough because it encounters too many vaccinated individuals, and so the majority of the population (even the unvaccinated people) are protected.
Herd, or community, immunity is the result of a high immunization rate. Courtesy: The National Institute of Allergy and Infectious Disease (NIAID)
Find out more here!
http://www.pbs.org/wgbh/nova/body/herd-immunity.html
Tracking Infectiousness
Scientists use a basic measure to track the infectiousness of a disease called the reproduction number — also known as R0 or “R naught.” This number tells us how many susceptible people, on average, each sick person will in turn infect.susceptible
Measles tops the list, being the most contagious with a R0 range of 12-18. This means a single person can infect, on average, 12 to 18 people in an unvaccinated population.
While measles may be the most virulent, vaccination efforts and herd immunity can curb its spread. The more people are immune to a disease, the less likely it is to proliferate, making vaccinations critical to prevent the resurgence of known and treatable diseases.
It’s hard to calculate and forecast the true impact of COVID-19, as the outbreak is still ongoing and researchers are still learning about this new form of coronavirus.
Find out more here!
https://www.visualcapitalist.com/history-of-pandemics-deadliest
SOURCES: VISUALCAPITALIST.COM, PUBLIC BROADCASTING SERVICE (PBS)
