Throughout the history of existence, mankind has faced many diseases. Some of them medicine was able to win, while others are still dangerous and are being studied by scientists. Several examples of the most dangerous infections in the history of mankind have been collected in the material.
Smallpox is an infectious disease caused by the variola virus. Smallpox is transmitted both by airborne droplets and through objects with which the infected person has come into contact.
The first signs of the disease are manifested in a sharp increase in temperature, headache, severe nausea and vomiting. The incubation period in this case can last from 7 to 17 days. After three days of active illness, the smallpox patient’s temperature drops slightly, and a nodular blistering rash appears on the body, after which scars remain.
By the way, most recently, humanity was faced with the so-called monkeypox, which was first discovered back in 1958. Read more about how the disease manifests itself and whether it is worth fearing, read in the material.
The causative agent of this infectious disease is the plague bacterium. It is found on small rodent animals and fleas – the parasites that live on them. The infection is transmitted to humans through the bite of a rodent, by direct contact with it or by airborne droplets from an already sick person.
Typical signs of plague are a sudden rise in temperature, severe headache and body aches, as well as chills and nausea. In bubonic plague, the bacillus infects the lymphatic system and turns the lymph nodes into festering wounds.
Despite the fact that the plague is quite a rare disease for the present, no one is immune from meeting with it. For example, from 2010 to 2015, 584 people died from various forms of this disease.
In 2018-2019, outbreaks of fever were recorded in the Congo – then about 2.3 thousand people died from Ebola. But an infectious disease over the long years of existence has claimed the lives of much more people.
Ebola is a disease caused by the EVD virus that infects humans and various animal species. The main symptoms of the disease are fever, kidney failure and jaundice. The incubation period can last from 2 days to 3 weeks, and the mortality rate from the disease reaches 90%.
This infectious disease poses a particular danger to humans. It is caused by the bacteria Vibrio Cholerae. Penetrating through the mouth, bacteria affect the intestinal mucosa and disrupt the digestive tract.
Cholera is spread through contaminated water and food, and is closely linked to poor sanitation and lack of clean drinking water.
The disease, known since ancient times, consistently takes the lives of millions of people. To prevent new outbreaks of the disease, two types of vaccines are used that provide sustained protection for 2 years.
This infection is still present in underdeveloped countries, especially in sub-Saharan Africa. There, 90% of people who are diagnosed with malaria die within a few days.
Malaria is characterized by periodic bouts of fever, enlargement of the spleen and liver, and anemia. The parasites that cause the disease are transmitted to humans through the bites of infected Anopheles mosquitoes.
Acquired immunodeficiency syndrome or AIDS is a disease that develops in people infected with the human immunodeficiency virus. The virus affects the immune system, weakens the body’s defense against infections and diseases.
HIV is transmitted, flowing into AIDS, sexually or through a transfusion of infected blood. Those who use contaminated needles or sharp instruments are also at risk. At the same time, AIDS can develop only 2-15 years after infection.
According to WHO data, there are currently about 37.9 million people worldwide who are infected with HIV, almost 2 million of them are children under 15 years of age.
This is the name of the varieties of viruses that were first discovered in the 1960s and are the cause of respiratory and gastrointestinal infections in both humans and animals.
In total, there are more than 39 coronaviruses, including COVID-19. A dangerous infectious disease can occur both in the form of an acute respiratory infection of a mild course, and in a severe one. In some cases, the disease develops into a “long covid”. Read more about what experts think about him in the material.
8 Swine Flu
Swine flu is a code name for a human viral infectious disease that was originally distributed among domestic pigs. The virus is transmitted by household and airborne droplets and causes symptoms typical of influenza and SARS. Including cough, headache, runny nose and fever.
By the way, one type of swine flu is Spanish flu. This epidemic is considered the most massive in terms of the number of deaths in the history of mankind.