The most dangerous and deadliest diseases in human history

I am sure the everage person will first think of HIV/AIDS when we talk about the most dangerous and deadliest diseases in the world or their minds will just stick to the latest desease that just grab headlines in the news.

I have taking my time to make research and analyse some of the most dangerous and deadliest diseases in the world. This list is subject to change as the case my be in future. Read on as i uncover the world most dangerous and deadliest diseases in history.

Spanish Flu

The 1918 flu pandemic (January 1918 – December 1920), also known as the Spanish flu, was an unusually deadly influenza pandemic, the first of the two pandemics involving H1N1 influenza virus. It infected 500 million people around the world,including people on remote Pacific islands and in the Arctic, and resulted in the deaths of 50 to 100 million (three to five percent of the world's population),making it one of the deadliest natural disasters in human history.

It is said that this flu killed more people in 24 weeks than AIDS killed in 24 years, and more in a year than the Black Death killed in a century. It is a contagious infection that spreads through the air when an infected person sneezes or coughs, more than half a million virus particles can be spread to those close by.

NOTE : There is no record or occurance of Spanish flu in the recent time.


The Black Plague

The Black Death, also known as the Great Plague or simply Plague, was one of the most devastating pandemics in human history, resulting in the deaths of an estimated 75 to 200 million people in Eurasia and peaking in Europe from 1347 to 1351.The bacterium Yersinia pestis, which results in several forms of plague, is believed to have been the cause.

The Black Death is thought to have originated in the dry plains of Central Asia, where it then travelled along the Silk Road, reaching Crimea by 1343.The plague disease, caused by Yersinia pestis, is commonly present in populations of fleas carried by ground rodents, including marmots,


There are no record or occurance of Black Plague in the recent time.


Ischaemic heart disease (coronary artery disease)

When arteries are narrowed, less blood and oxygen reaches the heart muscle. coronary artery disease (CAD) also called Ischaemic heart disease occurs when the blood vessels that supply blood to the heart become narrowed by a gradual build-up of fatty material within their walls. 

Although this disease is Non-communicable but number 1 killer in the world
according to reserch, this disese has killed over over 8.8M peoepl world wide.


Stroke

Stroke is a medical condition which occure when blood supply to the brain is interrupted or reduced,resulting in cell death. It occurs when an artery in the brain is blocked or leaks. This causes the oxygen-deprived brain cells to begin dying within minutes.

There are two main types of stroke: ischemic, due to lack of blood flow, and hemorrhagic, due to bleeding. They result in part of the brain not functioning properly. During a stroke, you feel sudden numbness and confusion or have trouble walking and seeing. If left untreated, a stroke can cause long-term disability.

Although this disease is Non-communicable but 1 of the top killer disese in the world according to reserch, this disese has killed over over 6.2M peoepl world wide.


Lower respiratory infections

This is an acute illness that occurs in a patient without chronic lung disease.It infections include pneumonia (infection of the lung alveoli), as well as infections affecting the airways such as acute bronchitis and bronchiolitis, influenza and whooping cough.

Although the symptoms are relatively mild and can be similar to the common cold. These include: Congestion or runny nose; Dry cough; Sore throat; Low-grade fever; Mild headache. Mild LRTIs can sometimes become more severe, leading to pneumonia

It is estimated that more than 3.4M people have died world wide as a result of this disese 


Chronic obstructive pulmonary disease

Chronic obstructive pulmonary disease (COPD) is a group of progressive chronic inflammatory lung diseases that causes obstructed airflow from the lungs.

The most common are emphysema and chronic bronchitis (Many people with COPD have both of these conditions). Symptoms include breathing difficulty, cough, mucus (sputum) production and wheezing. It's caused by long-term exposure to irritating gases/substances or damage the lungs.

It is a time killing diseases that have killed over 3.3M people world wide.


Respiratory cancers

Cancer is a condition where cells in a specific part of the body grow and reproduce uncontrollably.The cancerous cells can invade and destroy surrounding healthy tissue, including organs. Cancer sometimes begins in one part of the body before spreading to other parts.

It is a disease that affect the passage of airway in the respiratory system that conducts air into the lungs. Respiratory cancers include cancers of the trachea, larynx, bronchus, and lungs. The main causes are smoking, secondhand smoke, and environmental toxins. But household pollutions such as fuels and mold also contribute.

Respiratory cancers resulted in more than 150,000 deaths annually in the United States and 3.2 million deaths Worldwide as at 2015.


Tuberculosis

Tubercolosis is a contagious airborne disease caused by the bacteria Mycobacterium tuberculosis and Mycobacterium bovis. The bacteria usually attack the lungs, but they can also damage other parts of the body , like the brain and spine. 

TB is a contagious infection that spreads through the air when a person with TB of the lungs or throat coughs, sneezes, or talks.

It is estimated that TB has killed over 2.4M people worldwide 

Ebola 

Ebola virus disease (EVD), also known as Ebola hemorrhagic fever (EHF) or simply Ebola, is a viral hemorrhagic fever of humans and other primates caused by ebolaviruses.

Signs and symptoms typically start between two days and three weeks after contracting the virus with a fever, sore throat, muscular pain, and headaches, vomiting, diarrhea and rash usually follow, along with decreased function of the liver and kidneys. At this time, some people begin to bleed both internally and externally.The disease has a high risk of death, killing between 25 and 90 percent of those infected, with an average of about 50 percent.

It is a contagious virus that spreads by direct contact with body fluids, such as blood, of an infected human or other animals.It may also occur through contact with an item recently contaminated with bodily fluids. Semen or breast milk of a person after recovery from EVD may carry the virus for several weeks to months.

In recent time, deaths from some diseases have increased, those from more serious conditions have also decreased.But many of the diseases on this list are preventable and treatable. As medicine continues to advance and prevention education grows.

It is always wise to prevent these diseases or lower your risk of any of these conditions by living a healthy lifestyle with good nutrition and exercise. Avoiding smoking and drinking, hand washing can help prevent or reduce your risk of bacterial or viral infections.