This is called herd immunity
. Herd immunity
is resistance to the spread of a contagious disease within a population that is made possible only when a sufficiently high proportion of individuals are rendered immune to the disease through vaccination, mostly.
Ehrmann explains that herd immunity
is essential to maintain, because some people cannot be vaccinated due to medical conditions including allergies, illness, or a weakened immune system.
If herd immunity
is not sufficient and exposures continue, the outbreak could take off, said Caplan, the Illinois pediatrician.
Vaccine coverage is now insufficient in the US and many European countries to support so-called herd immunity
, which is achieved when a large enough share of the population is vaccinated - over 90 per cent in the case of the measles virus - to disrupt the chain of transmission.
"We need to collectively ensure and commit to bringing back herd immunity
to 95 percent.
This is the only way we can rebuild 'herd immunity
' and keep infectious diseases like measles down,' the mayor appealed.
What Paul -- a part-time ophthalmologist but full-time libertarian crank -- calls "a false sense of security" is technically known as herd immunity
. This is the level of vaccine coverage at which transmission of a pathogen becomes very difficult in an entire population of people.
Unfortunately, he will always be dependent on the management of herd immunity
within a community.
Unfortunately, only four states now have at least the 95 percent measles vaccination rate needed for "herd immunity
." In Clark County, Washington, where 7.9 percent of children were not vaccinated last school year, a measles outbreak involves at least 41 cases.
"As societal needle anxiety increases, our herd immunity
depends on overcoming fear and getting vaccinated," said chief executive officer Dr.
'Our aim is to vaccinate at least 70 per cent of the estimated 220,000 dogs in Sarawak in order to provide good herd immunity
and to effectively stop further spread of rabies among the dog population, thus preventing enzootic transmission to humans,' he said when winding up the debate at the State Legislative Assembly sitting today.
A new animated video from the campaign explains how herd immunity
can protect people in a community from infectious diseases and why it is important that everyone who can receive vaccines do so.