Millions of viruses live in communities around the world. Though they can be eradicated with the use of vaccination, some still can resist other environment and become deadly.

A serious viral infection may kill a person instantly. In the past, people had struggles and difficulty fighting bacterial and viral infections. One of the downfalls of civilization is the lack of cure of the disease and becomes rampant like the Bubonic plague.

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Here the history of the ten deadliest viruses in the world that have killed millions of people for the past decades.

Rabies

In the past, the rabies virus was used as a death sentence. As generation goes by, it continues to kill millions of people. Though there's a vaccine for this virus, it still kills 10 people per day and 50,000 people each year because some couldn't afford the vaccine, according to the report from The Independent.

Marburg virus

Marburg hemorrhagic fever or Marburg virus is quite similar to Ebola virus; they share the same subclass. The Marburg virus is transmitted through blood or other body fluids. It's not a really widespread virus, however, it is considered to be "incredibly deadly" because the death rate increases up to 88 percent in some outbreaks

Yellow fever

Typically, yellow fever spread by mosquitoes. There are affordable and effective vaccines that can reduce the virus from spreading. However, some people still acquire the virus and 30,000 were killed by yellow fever each year, World Health Organization reported.

HIV

One of the most familiar viruses among Americans today is HIV. It is associated with AIDS that kills thousands of people per year. As of the moment, there are reportedly 36 million people around the world that live with HIV.

Spanish flu

This is the deadliest version of influenza. According to some reports, the strain of this virus has killed a lot of people in 1918 than the bubonic plague in the 1300s. The total death of Spanish flu is estimated between 50 to 100 million.

Ebola

Ebola virus is mostly found in the remote and geographic areas in western Africa. It is extremely deadly; in a recent outbreak a few years ago it killed 10,000 people before the virus has gone. The transmission of the virus is through contact with bodily fluid and the fatality rate of those who are affected is 50 percent.

Dengue

Another mosquito-related virus is Dengue. Often found in tropical areas, in which the virus already spread in more than 100 countries. Each year, there are a million cases of Dengue fever. Even though there's a recently developed vaccine against the virus, it still continues to spread an affect some communities in the world.

Smallpox

Smallpox has been eradicated long time ago, thanks to vaccines. But before the Smallpox vaccine has been developed, it killed 50 million people each year. It was considered as an ancient virus, the early signs appeared in India and Egypt 3,000 years ago. In addition, other Egyptian mummies show traces of Smallpox.

Hepatitis

There are several types of Hepatitis. Some of its kinds are treatable, but, the virus is still considered to be deadly. The death cases of Hepatitis B are 686,000 every year, while the Hepatitis C killed nearly 20,000 people in the year 2014, according to CDC.

Measles

Before the vaccine against measles was invented in 1980, measles killed 2.6 million people per year. And it seems like measles is making its comeback that's why vaccines were also brought back.