Herd immunity (or community immunity) describes a form of immunity that occurs when the vaccination of a significant portion of a population (or herd) provides a measure of protection for individuals who have not developed immunity. Herd immunity theory proposes that, in contagious diseases that are transmitted from individual to individual, chains of infection are likely to be disrupted when large numbers of a population are immune or less susceptible to the disease. The greater the proportion of individuals who are resistant, the smaller the probability that a susceptible individual will come into contact with an infectious individual.
Vaccination acts as a sort of firebreak or firewall in the spread of the disease, slowing or preventing further transmission of the disease to others. Unvaccinated individuals are indirectly protected by vaccinated individuals, as the latter will not contract and transmit the disease between infected and susceptible individuals. Hence, a public health policy of herd immunity may be used to reduce spread of an illness and provide a level of protection to a vulnerable, unvaccinated subgroup.
This is why everyone must be vaccinated, and by not doing so, you are actually putting the community in danger.
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It’s cold out this morning. The daffodils are wilting, there’s a skin of ice on the birdbath, and the birds themselves are grumpy and spherical.
It always astounds me how a sleek, elegant little bird with the gracefully curved back and wings will transform into a ball of fluffy feathers with feet and a beak sticking out. This makes me wonder about feathered dinosaurs. We see them as these wonderful, lean killing machines all tooth and claw and heavy heads and haunches. But if a T-rex gets cold, does it fluff? Would there be a great “POOF!” noise out on the savannah, and suddenly it’s a two-story sphere of feathers with the big square head and feet sticking out, (teeny front limbs completely vanishing) making gruff bass chirps of annoyance? Would velociraptors be charging like murderous tribbles ‘cross the winter landscape?
The Age of Dinosaurs may be even cuter than previously theorized… - Ursula Vernon