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Virgin Soil Epidemic
Virgin soil epidemic is a term coined by Alfred Crosby, who defined it as epidemics "in which the populations at risk have had no previous contact with the diseases that strike them and are therefore immunologically almost defenseless." His concept is related to that developed by William McNeill, who connected the development of agriculture and more sedentary life with the emergence of new diseases as microbes moved from domestic animals to humans. Virgin soil epidemics have occurred with European colonization, particularly when European explorers and colonists brought diseases to lands they conquered in the Americas, Australia and Pacific Islands. The concept would later be adopted wholesale by Jared Diamond as a central theme in his popular book '' Guns, Germs and Steel'' as an explanation for successful European expansion. When a population has not had contact with a particular pathogen, individuals in that population have not built up any immunity to that organism an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alfred Crosby
Alfred W. Crosby Jr. (January 15, 1931 – March 14, 2018) was professor of History, Geography, and American Studies at the University of Texas at Austin, and University of Helsinki. He was the author of books including '' The Columbian Exchange'' (1972) and '' Ecological Imperialism'' (1986). In these works, he provided biological and geographical explanations for the question why Europeans were able to succeed with relative ease in what he referred to as the "Neo-Europes" of Australasia, North America, and southern South America. ''America's Forgotten Pandemic'' (1976) is the first major critical history of the 1918 "Spanish" Flu. Early life Alfred Worcester Crosby Jr. was born to Ruth ( née Coleman) and Alfred Worcester Crosby Sr. in Boston, Massachusetts, on January 15, 1931, grew up in Wellesley, Massachusetts, and graduated from Wellesley High School. Career In 1952, Crosby graduated from Harvard University, with a degree in history, then entered the U.S. Army in 1952, d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mortality Rates
Mortality rate, or death rate, is a measure of the number of deaths (in general, or due to a specific cause) in a particular population, scaled to the size of that population, per unit of time. Mortality rate is typically expressed in units of deaths per 1,000 individuals per year; thus, a mortality rate of 9.5 (out of 1,000) in a population of 1,000 would mean 9.5 deaths per year in that entire population, or 0.95% out of the total. It is distinct from "morbidity", which is either the prevalence or incidence of a disease, and also from the incidence rate (the number of newly appearing cases of the disease per unit of time). An important specific mortality rate measure is the crude death rate, which looks at mortality from all causes in a given time interval for a given population. , for instance, the CIA estimates that the crude death rate globally will be 7.7 deaths per 1,000 people in a population per year. In a generic form, mortality rates can be seen as calculated using (d/ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Influx Of Disease In The Caribbean
The first European contact in 1492 started an influx of communicable diseases into the Caribbean. Diseases originating in the Old World (Afro-Eurasia) came to the New World (the Americas) for the first time, resulting in demographic and sociopolitical changes due to the Columbian Exchange from the late 15th century onwards. The Indigenous peoples of the Americas had little immunity to the predominantly European diseases, resulting in significant loss of life and contributing to their enslavement and exploitation perpetrated by the European colonists. Waves of enslaved Africans were brought to replace the dwindling Indigenous populations, solidifying the position of disease in triangular trade. Infectious diseases Before the first wave of European colonization, the Indigenous peoples of the Americas and the Caribbean are thought to have lived with infrequent epidemic diseases, brought about by limited contact between tribes. This left them socially and biologically unprepar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ecological Imperialism
Ecological imperialism is the theory, advanced first by Alfred Crosby, that European settlers were successful in colonization of other regions because of their accidental or deliberate introduction of animals, plants, and disease leading to major shifts in the ecology of the colonized areas and to population collapses in the endemic peoples. The many pathogens they carried with them adversely affected the native populations of North America, Australia, and Africa, and were far more destructive than weaponry: it is estimated that disease wiped out up to 90 percent of indigenous people in some locations. Cortes and the Aztecs In the early 16th century, Spanish conquistador Hernán Cortés led an expedition to go to the New World, which lead him to what is now Mexico. The interaction between the Old World Spaniards and New World Aztecs resulted in the total destruction of the Aztec Empire within just two years (February 1519 – August 1521). In spite of the Europeans' more advan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columbian Exchange
The Columbian exchange, also known as the Columbian interchange, was the widespread transfer of plants, animals, precious metals, commodities, culture, human populations, technology, diseases, and ideas between the New World (the Americas) in the Western Hemisphere, and the Old World ( Afro-Eurasia) in the Eastern Hemisphere, in the late 15th and following centuries. It is named after the Italian explorer Christopher Columbus and is related to the European colonization and global trade following his 1492 voyage. Some of the exchanges were purposeful; some were accidental or unintended. Communicable diseases of Old World origin resulted in an 80 to 95 percent reduction in the number of Indigenous peoples of the Americas from the 15th century onwards, most severely in the Caribbean. The cultures of both hemispheres were significantly impacted by the migration of people (both free and enslaved) from the Old World to the New. European colonists and African slaves replaced Indig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Settler Colonialism
Settler colonialism is a structure that perpetuates the elimination of Indigenous people and cultures to replace them with a settler society. Some, but not all, scholars argue that settler colonialism is inherently genocidal. It may be enacted by a variety of means ranging from violent depopulation of the previous inhabitants to less deadly means such as assimilation or recognition of Indigenous identity within a colonial framework. As with all forms of colonialism, it is based on exogenous domination, typically organized or supported by an imperial authority. Settler colonialism contrasts with exploitation colonialism, which entails a economic policy of conquering territory to exploit its population as cheap or free labor and its natural resources as raw material. In this way, settler colonialism lasts indefinitely, except in the rare event of complete evacuation or settler decolonization. Political theorist Mahmoud Mamdani suggested that settlers could never succeed in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bubonic Plague
Bubonic plague is one of three types of plague caused by the plague bacterium ('' Yersinia pestis''). One to seven days after exposure to the bacteria, flu-like symptoms develop. These symptoms include fever, headaches, and vomiting, as well as swollen and painful lymph nodes occurring in the area closest to where the bacteria entered the skin. Acral necrosis, the dark discoloration of skin, is another symptom. Occasionally, swollen lymph nodes, known as " buboes," may break open. The three types of plague are the result of the route of infection: bubonic plague, septicemic plague, and pneumonic plague. Bubonic plague is mainly spread by infected fleas from small animals. It may also result from exposure to the body fluids from a dead plague-infected animal. Mammals such as rabbits, hares, and some cat species are susceptible to bubonic plague, and typically die upon contraction. In the bubonic form of plague, the bacteria enter through the skin through a flea bite a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mongol Empire
The Mongol Empire of the 13th and 14th centuries was the largest contiguous land empire in history. Originating in present-day Mongolia in East Asia, the Mongol Empire at its height stretched from the Sea of Japan to parts of Eastern Europe, extending northward into parts of the Arctic; eastward and southward into parts of the Indian subcontinent, attempted invasions of Southeast Asia and conquered the Iranian Plateau; and westward as far as the Levant and the Carpathian Mountains. The Mongol Empire emerged from the unification of several nomadic tribes in the Mongol homeland under the leadership of Temüjin, known by the more famous title of Genghis Khan (–1227), whom a council proclaimed as the ruler of all Mongols in 1206. The empire grew rapidly under his rule and that of his descendants, who sent out invading armies in every direction. The vast transcontinental empire connected the East with the West, and the Pacific to the Mediterranean, in an enforced '' Pax M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roman Empire
The Roman Empire ( la, Imperium Romanum ; grc-gre, Βασιλεία τῶν Ῥωμαίων, Basileía tôn Rhōmaíōn) was the post- Republican period of ancient Rome. As a polity, it included large territorial holdings around the Mediterranean Sea in Europe, North Africa, and Western Asia, and was ruled by emperors. From the accession of Caesar Augustus as the first Roman emperor to the military anarchy of the 3rd century, it was a Principate with Italia as the metropole of its provinces and the city of Rome as its sole capital. The Empire was later ruled by multiple emperors who shared control over the Western Roman Empire and the Eastern Roman Empire. The city of Rome remained the nominal capital of both parts until AD 476 when the imperial insignia were sent to Constantinople following the capture of the Western capital of Ravenna by the Germanic barbarians. The adoption of Christianity as the state church of the Roman Empire in AD 380 and the fall of the Western ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Influenza
Influenza, commonly known as "the flu", is an infectious disease caused by influenza viruses. Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue. These symptoms begin from one to four days after exposure to the virus (typically two days) and last for about 2–8 days. Diarrhea and vomiting can occur, particularly in children. Influenza may progress to pneumonia, which can be caused by the virus or by a subsequent bacterial infection. Other complications of infection include acute respiratory distress syndrome, meningitis, encephalitis, and worsening of pre-existing health problems such as asthma and cardiovascular disease. There are four types of influenza virus, termed influenza viruses A, B, C, and D. Aquatic birds are the primary source of Influenza A virus (IAV), which is also widespread in various mammals, including humans and pigs. Influenza B virus (IBV) and Influenza C virus (ICV) pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Typhus
Typhus, also known as typhus fever, is a group of infectious diseases that include epidemic typhus, scrub typhus, and murine typhus. Common symptoms include fever, headache, and a rash. Typically these begin one to two weeks after exposure. The diseases are caused by specific types of bacterial infection. Epidemic typhus is due to '' Rickettsia prowazekii'' spread by body lice, scrub typhus is due to '' Orientia tsutsugamushi'' spread by chiggers, and murine typhus is due to '' Rickettsia typhi'' spread by fleas. Vaccines have been developed, but none are commercially available. Prevention is achieved by reducing exposure to the organisms that spread the disease. Treatment is with the antibiotic doxycycline. Epidemic typhus generally occurs in outbreaks when poor sanitary conditions and crowding are present. While once common, it is now rare. Scrub typhus occurs in Southeast Asia, Japan, and northern Australia. Murine typhus occurs in tropical and subtropical areas o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malaria
Malaria is a mosquito-borne infectious disease that affects humans and other animals. Malaria causes symptoms that typically include fever, tiredness, vomiting, and headaches. In severe cases, it can cause jaundice, seizures, coma, or death. Symptoms usually begin ten to fifteen days after being bitten by an infected mosquito. If not properly treated, people may have recurrences of the disease months later. In those who have recently survived an infection, reinfection usually causes milder symptoms. This partial resistance disappears over months to years if the person has no continuing exposure to malaria. Malaria is caused by single-celled microorganisms of the ''Plasmodium'' group. It is spread exclusively through bites of infected ''Anopheles'' mosquitoes. The mosquito bite introduces the parasites from the mosquito's saliva into a person's blood. The parasites travel to the liver where they mature and reproduce. Five species of ''Plasmodium'' can infect and be spread by h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
