Top 10 Most Dangerous Viruses in the World 2020

Top 10 Most Dangerous Viruses in the World 2020

There are more than 320,000 only viruses that can affect mammals, and these viruses claim approximately 15 million lives every year. The following are the viruses whose extreme outbreak limited the travel and gave more than 2 billion dollars loss to the global economy. Have a look in the list of Top 10 Most Dangerous Viruses in the World.



1. Ebola

Ebola was first discovered in the state of Congo in 1976. Ebola is a deadly virus, and it spreads via humans to close human contact, so any kind of fluid-like mucus, saliva, breast milk, and infected blood can transfer it. The initial symptoms are fever, weakness, diarrhea, vomiting, and severe symptoms are blood coming from mouth or nose. Ebola’s recent outbreak held in Africa, claiming 11,000 people lives from 2014 to 2016. The fatality rate, according to WHO, is 50%. No exact vaccine is present for its cure, but preventive methods do save lives.  

2. Marburg

Marburg virus is a member of the filovirus family and was first discovered in lab researchers in 1967 in Germany transferred via green monkeys from Uganda. It causes hemorrhagic fever, sore throat, headache, diarrhea, and vomiting. The bat is told to be the source of the virus. The fatality rate of the Marburg virus is 90%, i.e., the severe symptoms of Marburg virus lead to death. Death happens when infections as bleeding, coagulation, and multiorgan failure occur. Marburg virus vaccine ye to be discovered.



3. HIV (Human Immunodeficiency Virus)

According to Dr. Amesh Adalja, it is the one that is the biggest killer. HIV was discovered in early 1980 and claimed more than 32 million people’s lives, and it is the highest number on the list that took a human being. HIV claimed more than 770,000 lives in 2018. In 2019 the fatality rate was decreased by 33% due use of potent antiviral drugs.

4. Rabies

The rabies virus is deathly if not treated immediately after. This virus dates back to 3200 B.C caused deaths, and it is still present in Africa and Asia mostly. Initial symptoms are pain, fever, paresthesia, or prickling at the wound site. The brain and spinal cord may dead after its severe infection to the nerve system. The rabies vaccination is present and is curative if given in time.



5. Influenza

The most lives this virus claimed in 1918 in Spain, killing 50 million humans in 2 years, and that outbreak is called Spanish flu. The second outbreak occurred in 2009, which infected 89 million humans worldwide called swine flu. Influenza vaccines are present and are effective, but highly infectious is cunning, i.e., the virus continually mutates and creates new strains.

6. Corona Virus

The corona family is called SARS, i.e., causes severe acute respiratory syndrome. There more than four viruses are in this family following are the viruses. First, of the family members, SARS-CoV started in Guangdong in china in 2002, infected 8000 people, and 770 deaths happened. The mortality recorded was 9.6 percent. The symptoms of this disease: body aches, fever, and pneumonia then at last failed lungs.  The second member of the SARS appeared was SARS-CoV-2 in Wuhan, China, in December 2019. Its source is a bat and then from intermediate animal transferred to humans. SARS-CoV-2 outbreak has limited the movements of humans worldwide.



The virus spread via contact with an infected person or the things/objects infected by a diseased person. The symptoms are dry cough, fever, and respiratory problems, and its mortality rate is estimated to be 2.4%. MERS(Middle East Respiratory Syndrome) is also a member of this family. Its first outbreak occurred in 2012 in Saudi Arabia, then in 2015 in South Korea. It has no vaccine-like SARS-CoV and SARS-CoV-2. Its most dangerous virus among SARS with a 30% to 40% mortality rate. 

7. Dengue



According to WHO, the virus that infects 50 to 100 million people is dengue. It was first discovered in Thailand and the Philippines in 1950. It is carried by mosquito bites and causes death if left untreated. The symptoms of dengue are fever and hemorrhagic fever in severe cases. We approved the vaccine in 2019. Its mortality rate is 2.5 % and 20% if not treated.

8. Smallpox

The virus that killed hundreds of thousands of humans throughout the years was declared eradicated in 1979 by WHO. It left scars sometimes blindness and, in extreme conditions, killed one of between three infected. Its symptoms are rash, fever, oozing pustules, and blistering. 

9. Hantavirus

Hantavirus is a pulmonary syndrome virus, and its first outbreak occurred in 1993 in New Mexico and Arizona. The deer mice contain the Hantavirus and can be transferred by inhaling urine or feces of deer mice or a rodent animal that contains bites the person. Its symptoms are muscle aches, fatigue and fever, and in severe conditions, shortness breath and coughing. The fatality rate is 38%, but early cure and oxygen therapy are helpful in prevention.

10. Lassa



Lassa was first discovered in Lassa, Nigeria, West Africa. Its mortality is 15% to 50%, almost 5000 people killed every year in West Africa. It possessed by rat type named Mastomys, a rodent animal, and also is airborne means it spread via air. Its symptoms are pain behind the chest and fever and extreme conditions mucosal bleeding, facial swelling, and deafness. It is treatable with antivirus if caught in the early stages.

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