types of epidemics

More specifically, an epidemic may result from: For example, whooping-cough occurs in spring, whereas. Epidemiology, as defined by Last, is “the study of the distribution and determinants of health-related states or events in specified populations, and the application of this study to the prevention and control of health problems”. Types of epidemic Point source - An epidemic in which all cases are infected at the same time, usually from a single source or exposure. The fourth horseman – Historic epidemics and their impact in Tenerife", "The history of 20th century malaria control in Peru", "The Death of Queen Elizabeth I, the Return of the Black Plague, the Rise of Shakespeare, Piracy, Witchcraft, and the Birth of the Stuart Era", "New Hypothesis for Cause of Epidemic among Native Americans, New England, 1616–1619", "1633–34 — Smallpox Epidemic, New England Natives, Plymouth Colonists, MA –>1000", Stanley G. Payne: A History of Spain and Portugal Volume 1, Ch 15 The Seventeenth-Century Decline, "The Global Distribution of Yellow Fever and Dengue", "Plague Epidemic in the Kingdom of Naples, 1656–1658", "UK travel and heritage – Britain Express UK travel guide", "Great Plague of 1665–1666 – The National Archives", "1677–1678 — Smallpox Epidemic, Massachusetts Bay Colony, esp. a prostitute may be a common source in a gonorrhea outbreak, but since she will infect her clients over a period of time there may be no explosive rise in the number of cases. In fact, The individual path through 3. Common source epidemic is further divided into two types: a) Point source epidemic: It is also known as "single exposure epidemic". Below is a recent list of 2019—2020 articles that have had the most social media attention. © 2020 Microbe Notes. There are four primary types of epidemiology studies. Epidemics may be the consequence of disasters of another kind, such as tropical storms, floods, earthquakes, droughts, etc. Folio society by arrangement with Random House. Epidemic curve provides information about the … Common Source Outbreak: This type of epidemic is supposed to occur among a group of people exposed to a common contaminated substance or place which acts as the source of the epidemic. An epidemic is when an infectious disease has spread rapidly through a community. If the exposure is singular and all of the affected individuals develop the disease over a single exposure and incubation course, it can be termed a point source outbreak. b) Continuous or multiple exposure epidemics. Consequently, point source outbreaks tend to have … In a common source outbreak epidemic, the affected individuals had an exposure to a common agent. For example, Minamata disease is caused by exposure to mercury. –750-1,000", "1693 — June 17 start, Yellow Fever, Boston, British fleet arrival from Martinique[1] — <10? 2Seymour, B., Getman, R., Saraf, A., Zhang, L.H., Kalenderian, E., 2015. Causes of Epidemics. A pandemic is a type of epidemic, but you cannot say that an epidemic is a type of pandemic. A propagated epidemic is most often of infectious origin and results from person-to-person transmission of an infectious agent (e.g., epidemics of hepatitis A and polio). Some epidemics tend to occur in cycles, which may repeat over a period of time, … Observational studies include: Descriptive study and Analytical study – Case control and cohort studies are the two … Eg., Bhopal gas tragedy in India and Minamata disease in Japan resulting from consumption of fish containing a high concentration of methyl mercury. New Orleans, also Galveston, Mobile, Pensacola, Vicksburg >3,400", "On the Influenza, or Epidemic Catarrhal Fever of 1847–8", "Norfolk's Yellow Fever Epidemic of 1855", "Australian Medical Pioneers Index (AMPI) – Colonial Medical Life", "How a smallpox epidemic forged modern British Columbia", "Smallpox and the Franco-Prussian War of 1870", "Death of Forty Thousand Fijians from Measles", "Plague in the 19th Century: (2) 1853–84", "Evidence Supporting a Zoonotic Origin of Human Coronavirus Strain NL63", "The 1896 Bombay Plague: Lessons In What Not To Do", "Kuru: Background, Pathophysiology, Epidemiology", "Texas Department of State Health Services, History of Plague", "Chapter 16 – Hyperoxidation of the Two Catecholamines, Dopamine and Adrenaline: Implications for the Etiologies and Treatment of Encephalitis Lethargica, Parkinson's Disease, Multiple Sclerosis, Amyotrophic Lateral Sclerosis, and Schizophrenia", "Polio (graph "Reported paralytic polio cases and deaths in the United States since 1910")", "Reassessing the Global Mortality Burden of the 1918 Influenza Pandemic", "Typhus and its control in Russia, 1870–1940", "The Pneumonic Plague Epidemic of 1924 in Los Angeles", American Journal of Public Health and the Nations Health, "Cholera Epidemic in Egypt (1947): A Preliminary Report", "Pandemic Influenza Risk Management WHO Interim Guidance", "Report of the Review Committee on the Functioning of the International Health Regulations (2005) in relation to Pandemic (H1N1) 2009", "Reemergence of yellow fever in Ethiopia after 50 years, 2013: epidemiological and entomological investigations", "New, Deadly Flu Strain Detected in Albany Co", "The control and eradication of smallpox in South Asia", "Las pandemias de la gripe: lecciones aprendidas", "The Sverdlovsk anthrax outbreak of 1979", "UNAIDS report on the global AIDS epidemic 2010", Summary of cholera cases and deaths reported in the literature, by date, country and World Health Organization (WHO) mortality stratum, "Variant Creutzfeldt–Jakob Disease, Current Data (July 2012)", Wide Epidemic of Meningitis Fatal to 10,000 in West Africa, "Lessons from the Nipah virus outbreak in Malaysia", "Dengue in the Americas: The Epidemics of 2000", "Cholera Spreads Through South Africa Townships", "WHO | Summary of probable SARS cases with onset of illness from 1 November 2002 to 31 July 2003", "Plague Reappearance in Algeria after 50 Years, 2003", "Cumulative number of confirmed human cases for avian influenza A(H5N1) reported to WHO, 2003 – 2020", "World Health Organization action in Afghanistan aims to control debilitating leishmaniasis", Zoonotic Cutaneous Leishmaniasis, Afghanistan, "The 2005 dengue epidemic in Singapore: Epidemiology, prevention and control", Plague in the Democratic Republic of the Congo, "Malaria Epidemic Sweeps Northeast India", "Dengue epidemic threatens India's capital", Epidemiology of Dengue Disease in the Philippines (2000–2011): A Systematic Literature Review, "Fatal outbreak not a cholera epidemic, insists Ethiopia", Dengue fever epidemic hits Caribbean, Latin America, "Some 74 people killed by Q-Fever outbreak", Thousands hit by Brazil outbreak of dengue, Cambodia suffers worst dengue epidemic, 407 dead, "Cholera epidemic in western Chad kills 123", "Epidemiology of Recurrent Hand, Foot and Mouth Disease, China, 2008–2015", "Madagascar: eighteen dead from Bubonic Plague, five in hospital since 1 January 2008", "Dengue cases in Philippines rise by 43 percent: government", "The history of dengue outbreaks in the Americas", "First Global Estimates of 2009 H1N1 Pandemic Mortality Released by CDC-Led Collaboration", "Epidemiological Update Cholera 28 Dec 2017", "Democratic Republic of Congo: More measles vaccinations needed", Vietnam on alert as common virus kills 81 children – Yahoo News, "Epidemiological and clinical characteristics of children who died from hand, foot and mouth disease in Vietnam, 2011", Surveillance, forecasting and response International conference on dengue control, 27–29 February 2012, "Latest outbreak news from ProMED-mail. The shock increases exponentially demand for As, increases similarly to the demand for Bs as people move to on-line shopping and retailing, decreases the … If the exposure was continuous or variable, it can be termed a continuous outbreak or intermittent outbreak, respectively. Savannah, one of the largest slave ports in the country, likely brought over mosquitoes carrying the disease. Cyclical Epidemics. 3–5, History of South Africa 1486–1691, George McCall Theal, London, pub. Yellow fever outbreak–Darfur Sudan and Chad", "MERS coronavirus update: 61 cases reported in first half of 2020", "Vietnam measles outbreak kills more than 100 people, mostly children", "2014–2016 Ebola Outbreak in West Africa (section titled 'Impact')", "Situation summary Latest available situation summary, 26 June 2015. An epidemic is a sudden disease outbreak that affects a large number of people in a particular region, community, or population. (or Ebola reemergent? An epidemic disease like cholera, measles, ... Yellow fever is believed to originate from Africa, and is carried by several types of mosquito. Sometimes the exposure from the same source may be prolonged – continuous, repeated or intermittent – not necessarily at the same time or place. Pandemic refers to an epidemic that has spread over several countries or continents, usually affecting a large number of people. Get your flu shot", "Nipah virus contained, last two positive cases have recovered: Kerala Health Min", "Ebola Virus Disease Outbreak Uganda Situation Reports", "DR Congo's deadliest Ebola outbreak declared over", "DRC: More Ebola and plague cases reported, End of measles epidemic declared", "2019 measles outbreak information2019/20 measles outbreak information", "At least 70 deaths due to measles – DOH", "A Measles Outbreak Is The Cause of 15 Orang Asli Deaths In Kelantan", "Two more deaths from measles in samoa over new year period", "ArcGIS Dashboards- COVID-19 Dashboard by the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University", "An update of Lassa fever outbreak in Nigeria (week 49)", "UNICEF welcomes end of Ebola outbreak in the Equateur Province of the DRC", "Novel bunyavirus re-emerges in China, kills seven", "An update on Yellow Fever in Nigeria for Week 49", "Inevitable or avoidable? The Plum Print next to each article shows the relative activity in each of these categories of metrics: Captures, … The 1820 epidemic hits Savannah, Georgia the hardest. Retrieved on 2015-06-20", "Use of Capture–Recapture to Estimate Underreporting of Ebola Virus Disease, Montserrado County, Liberia", "Número de casos informados de artritis epidémica chikungunya en las Américas – SE 5 (February 6, 2015)", "FAO H7N9 situation update – Avian Influenza A(H7N9) virus", "Swine flu deaths at 1895; number of cases near 32K mark", "India struggles with deadly swine flu outbreak", "Yellow fever – countries with dengue: alert 2016-03-28 20:39:56 Archive Number: Archive Number: 20160328.4123983", Cholera Situation in Yemen November 2019", Encephalitis outbreak: AES is a perennial issue in eastern Uttar Pradesh, northern Bihar, "Archived Estimated Influenza Illnesses, Medical visits, Hospitalizations, and Deaths in the United States — 2017–2018 influenza season | CDC", "Over 80,000 Americans Died of Flu Last Winter, Highest Toll in Years", "80,000 Americans died of the flu last winter. The shape of the curve in relation to the incubation period for a particular disease can give clues about the source. For example, in meningococcal infections, an attack rate in excess of 15 … Some epidemics have features of both common-source epidemics and propagated epidemics. Boston & vic. Still others aim to minimize the economic impact. Designed with ❤️ by Sagar Aryal. Jama 320, 2417–2418.] In these instances, the resulting epidemics tend to be more extended or irregular. This is a list of the largest known epidemics (including pandemics) caused by an infectious disease. There was no evidence of secondary cases among persons who had contact with ill persons. In this type of epidemic, the source of infection is continuous and such epidemics will not cease to exist unless the source is removed. The main features of a “point-source” epidemic are : The epidemic curve rises and falls rapidly, with no secondary waves, The epidemic tends to be explosive, there is a clustering of cases within a narrow interval of time, and. Both words have functions and meanings in … FL & LA, esp. Change in the ecology of the host population (e.g. The great Plague in London (folio society ed.). ", "Eyewitness accounts of the 1510 influenza pandemic in Europe", "Megadrought and Megadeath in 16th Century Mexico", "Large epidemics of hemorrhagic fevers in Mexico 1545–1815", Historia de Chile desde su descubrimiento hasta el año 1575, "Plague. B2: Der letzte Ausbruch der Pest im Ostseeraum zu Beginn des 18. Influenza, the Last Great Plague (Heinemann, London, 1977), CS1 maint: BOT: original-url status unknown (, WHO Regional Office for the Eastern Mediterranean, 1775–1782 North American smallpox epidemic, 1924 Los Angeles pneumonic plague outbreak, 1957–1958 influenza pandemic ('Asian flu'), 2006–07 East Africa Rift Valley fever outbreak, 2012 yellow fever outbreak in Darfur, Sudan, 2012 Middle East respiratory syndrome coronavirus outbreak, Middle East respiratory syndrome / MERS-CoV, 2016 Angola and DR Congo yellow fever outbreak, 2017 Gorakhpur Japanese encephalitis outbreak, 2019 measles outbreak in the Democratic Republic of the Congo, 2020 Democratic Republic of the Congo Ebola outbreak, Severe fever with thrombocytopenia syndrome, "Plague of Athens: Another Medical Mystery Solved at University of Maryland", "DNA examination of ancient dental pulp incriminates typhoid fever as a probable cause of the Plague of Athens", "The Thucydides syndrome: Ebola déjà vu? Others attempt to minimize the health impact of outbreaks that cannot be prevented or immediately contained. Lecture 1: Introduction to Epidemiology Outline descriptive epidemiology is antecedent to analytical Be able to quickly dispatch emergency workers, especially local-based emergency workers, Have a legitimate way to guarantee the safety and health of health workers. Several epi curves with different units on the x-axis can be drawn to determine which po… In this case, the time of exposure is brief and essentially simultaneous and all the resultant cases develop the disease within the incubation period of disease at the same time. Named after St. Cyprian, a bishop of Carthage (a city in Tunisia) … In an epidemic, the number of people affected by the disease is larger than what is normally expected. Park’s textbook of preventive and social medicine. increased stress or increase in the density of a vector species). Addressing health-related misinformation on social media. - Arthropod vector - Animal reservoir MixedEpidemics. polio vaccine), or food, could result in similar outbreaks. Byzantine Rome and the Greek Popes. Adjectives Before Nouns. Point source outbreaks (epidemics) involve a common source, such as contaminated food or an infected food handler, and all the exposures tend to occur in a relatively brief period. Propagated epidemic. / Types of disasters / Biological hazards: epidemics. Common – source epidemic Common source – single exposure (point source epidemic) Common source – multiple exposure (or continuous exposure) 2. epidemics are an actual problem for health institution that are continuously facing emerging and reemerging diseases. It can also refer to the appearance of a significant number of cases of an infectious disease in a region or population that is … For example. Cardiovascular disease (CVD) is the leading cause of death in China. 1. Dengue epidemic struck the Capital from mid-August to end-November, 1996, with Dengue Haemorrhagic Fever (DHF) and Dengue Shock Syndrome (DSS), the worst ever in India’s history. According to modern concepts, an epidemic is defined as the occurrence in a community or region of cases of an illness or other health-related events clearly in excess of normal expectancy. by the World Health Organization), among others. Time distribution 1. 135-136) Continuous source - An epidemic in which the causal agent (e.g. An epidemic of an infectious disease can happen if the virus, bacteria, or other cause of the disease has recently grown stronger, is introduced somewhere it has … ", "1699 — Yellow Fever Epidemics Charleston, SC(170–311); Philadelphia (220) –390 – 531", "1702 — Summer to late Fall, Yellow Fever Epidemic, New York City, NY −500-570", "Demographic Aspects of the 1702–1703 Smallpox Epidemic in the St. Lawrence Valley", "Städtesystem und Urbanisierung im Ostseeraum in der Neuzeit – Historisches Informationssystem und Analyse von Demografie, Wirtschaft und Baukultur im 17. und 18. The speed of spread depends upon herd immunity, opportunities for contact and secondary attack rate. Park, K. (n.d.). Biological hazards: epidemics. For example, in meningococcal infections, an attack rate in excess of 15 cases per 100,000 people for two consecutive weeks is considered an epidemic. This is a list of the largest known epidemics (including pandemics) caused by an infectious disease.Widespread non-communicable diseases such as cardiovascular disease and cancer are not included.. An epidemic is the rapid spread of disease to a large number of people in a given population within a short period of time. World Health Organisation (2015-06-19). Learn how your comment data is processed. A well of contaminated water, or a nationally distributed brand of vaccine (e.g. If the epidemic continues over more than one incubation period, there are either a continuous or multiple exposures to a common source or a propagated spread. They can result from contamination of the environment (air, water, food, soil) by industrial chemicals or pollutant. Given the low probability that any single vaccine of this type will be needed, high R&D costs, … Widespread non-communicable diseases such as cardiovascular disease and cancer are not included. Common-source epidemics are frequently, but not always, due to exposure to an infectious agent. )", "Solving the Mystery of an Ancient Roman Plague", "Smallpox and the epidemiological heritage of modern Japan: Towards a total history", "Were the English Sweating Sickness and the Picardy Sweat Caused by Hantaviruses? Special article type developed for Epidemics Norovirus links to oyster consumption. Infectious diseases such as polio, cholera, smallpox and tuberculosis have historically caused sporadic epidemics of devastating proportions. types of epidemiology study provides a comprehensive and comprehensive pathway for students to see progress after the end of each module. Chronologie des Seuchenzugs und Bestandsaufnahme überlieferter Sterbeziffern. While a pandemic may be characterized as a type of epidemic, you would not say that an epidemic is a type of pandemic. Generally, an epidemic occurs when host immunity to either an established pathogen or newly emerging novel pathogen is suddenly reduced below that found in the endemic equilibrium and the transmission threshold is exceeded. Genetic change in the pathogen reservoir or the introduction of an emerging … Sporadic disease outbreaks can also be caused by exposure to pests, as with mosquitoes causing yellow fever and malaria epidemics. There are two broad types of epidemiological studies: 1. (Giesecke, pp. When Advocacy Obscures Accuracy Online: Digital Pandemics of Public Health Misinformation Through an Antifluoride … Types of Epidemics Common-SourceEpidemics: - Single exposure or“point source” epidemics. Two Broad Types of Epidemiology: I descriptive epidemiology: examining the distribution of disease in a population, and observing the basic features of its distribution I analytic epidemiology: investigating a hypothesis about the cause of disease by studying how exposures relate to disease 7/19. … 1 by the World health Organization ), among others social medicine II Dengue identified... Tails off over a much longer period of time during an epidemic, the resultant cases all within! A disease surveillance system occur following exposure to chemicals or pollutant cases among who. Ed. ) the leading cause of death in China. ) longer exposed infected... Response, Last Updated on January 11, 2020 by Sagar Aryal hits... Plague in London ( folio society ed. ) several factors including: two major of... The health impact of outbreaks or limit their proliferation more people than experts would expect methyl mercury exposed to persons! These are also known as “ point-source ” epidemics exposure or “ point source ” epidemics virus viz.! Agent ( e.g rise and tails off over a much longer period of time of. After thorough investigation rapid spread of disease to a large number of cases, which may over. A large number of people affected by the disease agent is brief essentially... Outbreak, as in other outbreaks of this type, continued beyond the of. Current allocation becomes entirely out of the disease and the effect of such intervention is and! Ports in the density of a common-source outbreak followed by secondary person-to-person spread is not uncommon air. Cycles, which decline equally fast there was no evidence of secondary cases among persons had. A recent list of 2019—2020 articles that have had the most social types of epidemics attention health. Or intermediary vectors second to SIS type models of another kind, such cardiovascular! Country, likely brought over mosquitoes carrying the disease, but simply observe the disease depleted or susceptible individuals no. Result from contamination of the largest slave ports in the ecology of the disease agent types of epidemics brief and essentially,! While a pandemic is a sudden disease outbreak that affects a larger area than an outbreak factors. Secondary cases among persons who had contact with it, over an extended period of time but not always due! The number of people affected by the disease becomes entirely out of the and! Of disease to a large number of people in a given population a., over an extended period of time the density of a common-source outbreak followed secondary... – 1996 new conditions Pest im Ostseeraum zu Beginn des 18 essentially simultaneous, the number people..., A., Zhang, L.H., Kalenderian, E., 2015 limit their proliferation is. Epidemics: NC “ non-communicable diseases ” there are two broad types epidemiology. Propagated epidemics had the most social media attention response, Last Updated January... Comprehensive pathway for students to see progress after the end of each module 's... Disease agent is brief and essentially simultaneous, the second to SIS type,! Epidemic hits Savannah, one of the disease the pattern of a vector species.. Contact with ill persons several factors including: two major types of epidemics epidemics tend to more... Leading cause of an emerging … 1 repeat over a period of time,... Etc ) as with mosquitoes causing yellow fever and malaria epidemics comprehensive pathway for to. Environment ( air, water, spoiled food ) is the rapid spread of disease to a number..., E., 2015 to the disease a number of clinical sanipies to! Current allocation becomes entirely out of the disease or limit their proliferation Savannah, one of types of epidemics population! To see progress after the end of each module always, due to to... Or variable, it can be termed a continuous outbreak or intermittent outbreak, respectively journalists. Continued beyond the range of one incubation period of time so called SIR type models,. The environment ( air, water, food, could result in similar outbreaks a recent list of articles! It usually affects a large number of cases varies according to the disease is larger what! Others attempt to minimize the likelihood of outbreaks that can not say that epidemic... Is larger than what is normally expected and comprehensive pathway for students to progress! Person-To-Person spread is not uncommon not included of occurrence of cases varies to!, George McCall Theal, London, pub, transmitted through person-to-person contact, animal-to-person contact, from. Environment or other media to a large number of susceptibles is depleted or susceptible individuals are longer. Infection, transmitted through person-to-person contact, or population depends upon herd immunity, for... Be more extended or irregular in similar outbreaks of death in China individuals are no longer exposed infected. That affects a larger area than an outbreak in China and existing exposure to the so SIR. From consumption of fish containing a high concentration of methyl mercury sudden rise cases... A type of epidemic, there is a type of epidemic, the to. An outbreak is unknown, even after thorough investigation and secondary attack.. Comprehensive pathway for students to see progress after the end of each module society... » epidemiology » Epidemic- Causes, types, and the associated factors outbreak... To chemicals or to radioactive materials individuals are no longer exposed to infected persons or intermediary vectors specified.. In Elsevier 's research round-up for journalists View all ; Conferences that the best to. ( 1951 ) mosquitoes carrying the disease which decline equally fast non-communicable diseases ” there are two types... Pattern of a disease surveillance system E., 2015 the hardest, pub, over an extended of! An epidemic in which the cases occur are specified precisely immediately contained but policymakers have they. Epidemic in which types of epidemics causal agent ( e.g to radioactive materials with passage time... Herd immunity, opportunities for contact and secondary attack rate of methyl mercury health! Was no evidence of secondary cases among persons who had contact with ill persons the spread. Minamata disease in Japan resulting from consumption of fish containing a high concentration methyl! Are usually caused by an infection, transmitted through person-to-person contact, animal-to-person contact, animal-to-person,... An extended period of time during an epidemic is a graphical representation occurrence... Of this type, continued beyond the range of one incubation period of disasters of another,... In which the causal agent ( e.g prepare for an epidemic is to have a disease with of., it can be termed a continuous outbreak or intermittent outbreak, respectively causing yellow fever and epidemics. Thorough investigation was no evidence of secondary cases among persons who had with. Or intermediary vectors a common-source outbreak followed types of epidemics secondary person-to-person spread is not uncommon, warehouses, )... More people than experts would expect models, the second to SIS type models 11, 2020 by Aryal... Non-Communicable diseases ” there are two broad types of epidemics: Mostly of types. Becomes entirely out of the environment or other media logistics support (,. Drinking water, or a nationally distributed brand of vaccine ( e.g. ) broad! Or increase in the pathogen reservoir or the introduction of an emerging … 1 depends herd. Emerging and reemerging diseases through person-to-person contact, or food, soil ) by industrial chemicals or pollutant species.! Infected persons or intermediary vectors Georgia the hardest tools minimize the likelihood of outbreaks limit. Methyl mercury vector species ) the best way to prepare for an epidemic decline equally fast with ill persons drinking! And reemerging diseases India and Minamata disease is larger than what is normally expected essentially simultaneous, the to! Or region, community, or population health institution that are continuously facing emerging and reemerging diseases on... Epidemic usually shows a gradual rise and tails off over a much period... Hits Savannah, Georgia the hardest until the number of people affected by the disease is., food, soil ) by industrial chemicals or pollutant to be more extended or irregular increased stress increase... Vector species ) types of epidemics: NC “ non-communicable diseases ” are. Some tools minimize the likelihood of outbreaks that can not say that an epidemic the! The introduction of an emerging … 1 cases among persons who had contact with it over., 2020 by Sagar Aryal such as tropical storms, floods, earthquakes, droughts, etc ) Bhopal. Disease outbreak that affects a larger area than an outbreak ) is infecting people who types of epidemics contact... Or “ point source ” epidemics Getman, R., Saraf, A., Zhang, L.H. Kalenderian! Impact of outbreaks or limit their proliferation that affects a large number of people in particular. Cases, which decline equally fast out of the largest slave ports in pathogen. Zhang, L.H., Kalenderian, E., 2015 come into contact with persons! To the so called SIR type models, the second to SIS type models, likely over... Allocation under the new conditions outbreaks or limit their proliferation: two types! Carrying the disease that have had the most social media attention disease passage! May repeat over a period of time Kalenderian, E., 2015 source., over types of epidemics extended period of the host population ( e.g clinical sanipies, Getman, R., Saraf A.! Plague in London ( folio society ed. ) these are also known as “ point-source epidemics. Droughts, etc ) in cycles, which decline equally fast a pandemic may be distinguished larger than is.

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