Important Information

Viruses are tinier than bacteria. In fact, the largest virus is smaller than the smallest bacterium. All viruses have is a protein coat and a core of genetic material, either RNA or DNA. Unlike bacteria, viruses can't survive without a host. They can only reproduce by attaching themselves to cells. In most cases, they reprogram the cells to make new viruses until the cells burst and die. In other cases, they turn normal cells into malignant or cancerous cells.
Also unlike bacteria, most viruses do cause disease, and they're quite specific about the cells they attack. For example, certain viruses attack cells in the liver, respiratory system, or blood. In some cases, viruses target bacteria.
List of some deadly viruses
Marburg virus-Marburg virus is similar to Ebola in that both can cause hemorrhagic fever, meaning that infected people develop high fevers and bleeding throughout the body that can lead to shock, organ failure and death
Ebola virus- Ebola is spread through contact with blood or other body fluids, or tissue from infected people or animals. The known strains vary dramatically in their deadliness, Elke Muhlberger, an Ebola virus expert and associate professor of microbiology at Boston University, told Live Science.
Rabies-It destroys the brain, it's a really, really bad disease, although rabies vaccines for pets, which were introduced in the 1920s, have helped make the disease exceedingly rare in the developed world, this condition remains a serious problem in India and parts of Africa.
HIV-In the modern world, the deadliest virus of all may be HIV. "It is still the one that is the biggest killer," said Dr. Amesh Adalja, an infectious disease physician and spokesman for the Infectious Disease Society of America.
Smallpox- Humans battled smallpox for thousands of years, and the disease killed about 1 in 3 of those it infected. It left survivors with deep, permanent scars and, often, blindness.
Hantavirus-Hantavirus pulmonary syndrome (HPS) first gained wide attention in the U.S. in 1993, when a healthy, young Navajo man and his fiancée living in the Four Corners area of the United States died within days of developing shortness of breath. A few months later, health authorities isolated hantavirus from a deer mouse living in the home of one of the infected people.
Influenza-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. Up to 40% of the world's population now lives in areas where dengue is endemic, and the disease — with the mosquitoes that carry it — is likely to spread farther as the world warms.
Rotavirus-Two vaccines are now available to protect children from rotavirus, the leading cause of severe diarrheal illness among babies and young children. The virus can spread rapidly, through what researchers call the fecal-oral route (meaning that small particles of feces end up being consumed).
SARS-CoV -The virus that causes severe acute respiratory syndrome, or SARS, first appeared in 2002  in the Guangdong province of southern China, according to the WHO. The virus likely emerged in bats, initially, then hopped into nocturnal mammals called civets before finally infecting humans. After triggering an outbreak in China, SARS spread to 26 countries around the world, infecting more than 8000 people and killing more than 770 over the course of two years.
SARS-CoV-2-SARS-CoV-2 belongs to the same large family of viruses as SARS-CoV, known as coronaviruses, and was first identified in December 2019 in the Chinese city of Wuhan. The virus likely originated in bats, like SARS-CoV, and passed through an intermediate animal before infecting people.
MERS-CoV -The virus that causes Middle East respiratory syndrome, or MERS, sparked an outbreak in Saudi Arabia in 2012 and another in South Korea in 2015. The MERS virus belongs to the same family of viruses as SARS-CoV and SARS-CoV-2, and likely originated in bats, as well. The disease infected camels before passing into humans and triggers fever, coughing and shortness of breath in infected people. 
List of some deadly bacteria
Anthrax-a severe infection caused by the rod-shaped, Gram-positive bacterium Bacillus anthracis (refer to all shapes of bacteria here). Anthrax comes in three forms: lung anthrax or pneumonia, skin anthrax, and intestinal anthrax. All of these forms when not treated immediately can result to death.
Tetanus- This bacterial illness is also known as lockjaw, tetanus is a fatal bacterial infection that affects the brain and the nervous system. It is caused by the bacterium Clostridium tetani that produces a toxin that paralyzes muscle.
Leptospirosis-Leptospirosis is a bacterial infection that can be obtained when the eyes, nose, or an open wound is exposed to soil or water that is contaminated with the bacteria. This bacteria is commonly found in animal urine.
Tuberculosis-Mycobacterium tuberculosis. Tuberculosis is a highly contagious disease that infects the lungs. It symptoms include fever, weight loss, night sweats and persistent cough that may last for many months.
Pneumonia- Klebsiella pneumoniae. Pneumonia is an infection in the lungs and can be caused by bacteria, viruses, or even fungi. In the case where the lungs get infected with the bacterium Klebsiella pneumoniae, the alveoli (air sacs) of the lungs become filled with pus, making it hard to breathe.
Cholera-Vibrio cholerae. Cholera is a type of bacterial disease that is often characterized by watery diarrhea and severe dehydration. When left untreated, it can lead to death.
Botulism-Clostridium botulinum. Botulism is a rare yet extremely fatal bacterial disease caused by the bacterium Clostridium botulinum. Basically, this bacterium produces the substance botulinum, a type of lethal neurotoxin that paralyzes different muscles.
Pseudomonas Infection-Pseudomonas aeruginosa. Caused by the common bacterial pathogen Pseudomonas aeruginosa, pseudomonas infection targets the respiratory system. Here, the bacterium damages the lungs and worsens the conditions of people with cystic fibrosis.
MRSA Infection- Methicillin-resistant Staphylococcus aureus. The bacterium Staphylococcus aureus is a naturally occurring bacterium present in our noses. However, a different strain of that bacterium, known as the MRSA or Methicillin-resistant Staphylococcus aureus (biofilm), has evolved to become insensitive to the antibiotic methicillin. Because the bacterium is very resistant to even the most powerful antibiotics, it has been dubbed as the “superbug“.
E.Coli Infection- Escherichia coli. As its name suggests, E.coli infection is caused by the fecal coliform bacterium E.coli. The symptoms of the infection are similar to diarrhea that is accompanied by a very high fever.
Meningitis- Neisseria meningitidis, Listeria monocytogenes, Streptococcus pneumoniae, E.coli. Meningitis is a type of bacterial disease in the body that affects the brain and the spinal cord. During the infection, the bacterium causes swelling of the meninges (protective membranes) around the said organs.
Bubonic Plague-Yersinia pestis. Caused by the bacterium Yersinia pestis, bubonic plague is considered to be the most common type of plague. This bacterial disease is usually characterized by the swelling of lymph nodes (called buboes) in the groin and armpits.
Smallpox-Variola major. Smallpox is a contagious and fatal disease characterized by severe rash of blisters on different parts of the body like the face, chest, arms, and legs.

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