Diseases Caused by Viruses in Human Body

Virus Facts

Thre are around 320000 viruses which can infect mammals alone. The deadliest of these viruses are responsible for killing 15 million people every year.

They are ancient they are deadly and they are found everywhere killing millions of people every year.

So far there is no known life-form on earth that viruses cannot infect

Let’s go over the top 10 deadliest viruses the world has ever seen and the diseases caused by them to Humans.


Rotavirus also known as the Child killer is a merciless virus that causes the deaths of more than a half a million children every year.

It is the leading cause of disease called severe diarrhea, illness among babies and young children.


Smallpox virus is one of the world’s deadliest viruses that had killed more humans than any other virus in human history.

With fatality rates of up to 90% it is responsible for killing 300 to 500 million people in the 20th century.

The good news is that thanks to modern medicine smallpox has been eradicated worldwide.


measles has done a pretty good job of killing people throughout the ages over the last 150 years the virus has been responsible for the deaths of around 200 million people.

It has a yearly mortality rate of 197 thousand deaths


Dengue is one of the deadliest viruses humanity has ever encountered. The virus spreads via mosquitoes.

Now endemic in 110 countries dengue infects more than 100 million people a year and causes 20,000 deaths.

Yellow Fever

One of history’s biggest killers is yellow fever in severe cases of yellow fever the virus can cause bleeding from the mouth nose eyes or stomach.

Around 50% of the patients who enter this toxic phase are dead within seven to ten days.

Today the virus infects 200,000 people worldwide killing 30,000 people each year.

Everybody gets the flu and for the majority it may not be nice but it’s no big deal.

That being said every year influenza is responsible for up to 500,000 deaths worldwide. The most deadly flu pandemic was the Spanish flu that killed 50 to 100 million people.

The pandemic is described as the greatest medical Holocaust in history.


Rabies has been one of mankind’s most feared diseases since ancient times and with good reason.

Infection with rabies occurs when bitten or scratched by an infected animal most commonly dogs or bats.

Nearly 60,000 people die of rabies every year most of these deaths occur in Africa and southern Asia.

Hepatitis B

Hepatitis B causes the largest share of fatalities every year with a death toll of around 700,000. The virus attacks the liver which results in either liver cancer or psoraisis.

Although the overall death rate from hepatitis C is lower than B it still kills an estimated 350,000 people every year.

Ebola and Marburg Virus

If ever there were viruses that could cause fear in the 21st century it’s the Ebola and Marburg viruses.

These viruses have some very unpleasant symptoms and are potentially the deadliest viruses on earth today.

Both these viruses have no vaccine no effective treatment and a fatality rate of up to 90%.


Today there are about 40 million people living with HIV.

Sadly only around half of those infected have access to the required drugs needed for treatment so the global death rate from AIDS is still shockingly high.

Estimates suggest that there are nearly 2 million deaths every year in over the last 30 years the virus has claimed over 25 million lives.

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