From ancient time, human fought several war with deadly viruses. Lets explore the list of deadly viruses one by one.
Marburg virus
This virus discovered in 1967 among German lab workers. This virus came from infected monkeys imported from Uganda. Its symptom was hemorrhagic fever.
It also was responsible for organ failure and death. Its mortality rate in the first outbreak was 25%, but it was more than 80% in the 1998-2000 outbreak in the Democratic Republic of Congo, as well as in the 2005 outbreak in Angola, according to the World Health Organization (WHO).
Rabies
It was introduced in 1920. Muhlberger said “It destroys the brain, it’s a really, really bad disease,” “We have a vaccine against rabies, and we have antibodies that work against rabies, so if someone gets bitten by a rabid animals. we can treat this person, if you don’t get treatment, there’s a 100% possibility you will die.”
This virus is problem in developing countries like India & Africa.
HIV
According to Dr. Amesh Adalja , “It is still the one that is the biggest killer, The infectious disease that takes the biggest toll on mankind right now is HIV. ”
Global situation and trends ” Since the beginning of the epidemic, 75 million people have been infected with the HIV virus and about 32 million people have died of HIV. Globally, 37.9 million [32.7–44.0 million] people were living with HIV at the end of 2018. An estimated 0.8% [0.6-0.9%] of adults aged 15–49 years worldwide are living with HIV, although the burden of the epidemic continues to vary considerably between countries and regions. The WHO African region remains most severely affected, with nearly 1 in every 25 adults (3.9%) living with HIV and accounting for more than two-thirds of the people living with HIV worldwide. “
Smallpox
In the 20th century only, smallpox killed 300 million people. It left survivors with deep, permanent scars and, often, blindness.
Influenza
when a new flu strain emerges, a pandemic results with a faster spread of disease and, often, higher mortality rates.
The most deadly flu pandemic, sometimes called the Spanish flu, began in 1918 and sickened up to 40% of the world’s population, killing an estimated 50 million people.
Dengue
Dengue virus first appeared in the 1950s in the Philippines and Thailand, and has since spread throughout the tropical and subtropical regions of the globe.