One of the oldest diseases, which is still circulating in third world countries today, is measles.
The first cases of measles were recorded in the seventh century, and if a person is not vaccinated, the death rate is between 15 and 25 percent, according to data from the U.S. Center for Infectious Disease Control and Prevention (CDC).
Due to the duration of measles, it is not possible to determine how many lives this disease took.
According to the World Health Organization, measles (airborne transmission) is the most contagious, and between 92% and 95% of the population had to be vaccinated to prevent the spread of the disease from five to eight percent.
Polio or poliomyelitis, also a very dangerous disease, XVIII. It was registered in the century and mostly affects children between the ages of three and eight.
Before the vaccine appeared in the middle of the last century, the mortality rate was between two and five per cent in children, from 15 per cent to 30 per cent in adults, and this percentage rose to 75 per cent with brain complications.
The WHO adds that about 80 percent of collective immunity to polio (transmitted through oral and fecal routes) is about 80 percent.
Smallpox or smallpox is the oldest disease today, having originated in India about 3,000 years ago.
WHO data show that, without vaccines, the mortality rate is 30 percent, and that survivors tend to have permanent scars.
We do not know how many people have died as a result of this virus.
According to WHO experts, in order to neutralize smallpox (transmitted by air and droplets) it is necessary to insert 80 percent of people.
The rubbish vaccine was given in 1926, but according to the US CDC, there are currently 24.1 million patients in the world, and 160,000 people die each year.
According to Harvard data, a small cough (contaminated with air and drops) requires the immunization of 92-94 percent of the population to protect the rest.
Mumps is also a very old disease, which was recorded in the 5th century, and the mortality rate per 10,000 population is between 1.6 and 3.8 percent, due to complications caused by inflammation of the brain.
According to Harvard data, paper, which is transmitted by air and drops, requires between 75 and 86 percent of the population and is vaccinated in 1967.
In developed countries, the death rate of rubella virus (airborne and droplet transmission) is between 0.05 and 0.1 percent per 1,000 cases, significantly lower than in third world countries, where the death rate is between three and six percent.
The virus was registered in 1815, the vaccine was given in 1967, and it is estimated that between 83% and 85% of the immune system produces collective immunity, according to Harvard data.
SARS was discovered in China in 2002 and remained in operation until 2004, and is transmitted by air and drip.
According to the WHO, the death rate was around 11% at the end of the epidemic, which affected four countries in addition to China.
8,098 people were infected and 774 died in July 2003 when the WHO declared an end to the epidemic, although there were several cases the following year.
The vaccine does not yet exist, although the virus has mysteriously disappeared so far.
In the case of SARS (airborne and droplet transmission), between 50 and 80 percent of the population’s immunity is extended to stop the spread.
Ebola (transmitted by body fluids), the most dangerous of these viruses, has a mortality rate of about 50 percent.
The first case was reported in the Congo in 1976, and it is estimated that more than 80% of people need to be vaccinated to get herd immunity, however, that number is uncertain because they are not sure how long it can protect against Ebola. The US FDA (Food and Drug Administration) approved the first vaccine in 2019.
In addition to Ebola, the Kovid-19 – MERS “cousin” is a major threat to humanity.
MERS belongs to the coronavirus group, and the first case was registered in 2012 in Jeddah, Saudi Arabia, and the mortality rate was between 34 and 35 percent in January 2020, according to the WHO.
There were 858 deaths out of 2,519, and it is also called MERS camel concord disease, a virus that was transmitted to humans.
It is not yet entirely certain that it is transmitted only by drop or that there are other ways of transmitting it from person to person.
With regard to covetous 19, one of the coronavirus viruses transmitted by air and drip, scientists still cannot agree on what percentage of immunity is needed to achieve flock immunity, especially because it is a virus that returns after a few. a few months and not everything is known yet.
So far more than 1.5 million people have died from covidae 19, nearly 70 million cases have been infected worldwide, and to stop the spread and scientists have yet to agree, it is necessary to have immunity between 60% and 80% of people.
Collective immunity or “herd immunity” arises when most people in a community develop immunity to a disease that prevents them from transmitting the disease, so the whole community is protected, not just those who have immunity to a particular disease.
In order to develop collective immunity, it is first necessary to spread the infection, to vaccinate people, so that different percentages of different diseases must occur in order to develop “herd immunity”.