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a full essay on hantavirus
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SIN NOMBRE VIRUS RISK ASSESMENT IN YOSEMITE NATIONAL PARK
Hantaviruses are a genus of virus that are single-stranded, negative-sensed RNA viruses with a tripartite genome, represented by 45 different species across a worldwide distribution (Dearing and Dizney, 2010). They are pathogens primarily hosted by small mammals, in the family Muridae, with rats and mice making up the majority of these hosts. Hantaviruses first came to be known when two major disease events occurring in the twentieth century lead to the discovery of both old and new world hantaviruses (Johnson et al 2010). Old world hantavirus were first discovered during the Korean War (1950-1953) when over 3,000 U.N and Korean soldiers became stricken with hemorrhagic fever with renal syndrome (HFRS). New world hantaviruses were first discovered in the four corners region of the Southwest United States during an outbreak of Hantavirus Pulmonary Syndrome (HPS) in 1993.
Since 2006, 22 new species of hantaviruses have been identified globally in Soricomortpha insectivores and in west African bats which may imply that more species of hantavirus will be discovered amongst a variety of different host species as sampling efforts continue globally (Wen-Ping et al. 2013). Presently 21 hantavirus have been known to cause similar human diseases that have been categorized within HFRS and HPS as the dominant syndromes in the old world and new world respectively (Jonssen et al. 2010). HFRS symptoms in humans may develop within 1 to 2 weeks after exposure, and up to 8 weeks in some cases (CDC 2013). HFRS can cause various hemorrhagic manifestation, circulation disorders, and renal failure and is associated with human mortality rates between 0.1% to 15% (Muranyi et al. 2005).
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Even with these experimental management practices in place, it is highly unlikely that SNV will be eliminated from deer mice populations in Yosemite National Park. However these experimental methods can give us crucial information pertaining to location specific deer mice/SNV transmission dynamics within the park boundaries which then may allow us to create better management strategies in controlling the disease. More research needs to be done in gaining a better understanding of deer mice social community behavior, investigating the link between deer mice SNV prevalence and human HPS outbreaks, and breaking down and understanding the multiple factors that attribute the “trophic cascade” and how precipitation and climate can influence rodent populations (Calisher 2002). It has been shown that SNV disease dynamics and patterns are different in unique locations
This extremely pathogenic zoonotic virus is now understood to travel from bat species, to equine intermediate hosts, to humans.[8, 10] The Hendra virus is listed as a Bio-Safety Level (BSL)-4, and can only be studied at a few adequately equipped laboratories worldwide due to its virulence.[1, 2] Case fatality rates
The medical field is a vast land of beauty, but with great beauty comes immense horror. There are many deadly viruses and diseases found in the medical field. In the novel, The Hot Zone by Richard Preston, the author discusses the many deadly viruses found in the field. The viruses are widespread due to the errors that occur when the viruses are in the presence of human beings. The effects of the errors performed by the human race include a decrease in population and wildlife.
Weeks, P., & Packard, J. (2009). Feral hogs: Invasive species or nature. Human Organization, 68(3), 280-292. Retrieved from http://wk4ky4tk9h.scholar.serialssolutions.com.library.esc.edu/?sid=google&auinit=P&aulast=Weeks&atitle=Feral Hogs: Invasive Species or Nature's Bounty?&title=Human organization&volume=68&issue=3&date=2009&spage=280&issn=0018-7259
White-tailed deer, along with the rest of the Cervidae family, are facing a possible epidemic. Although the disease has not spread over the entire range CWD is efficiently transmitted between individuals. CWD is to the best of our knowledge 100% fetal and incubation can take a few years allowing for many possible transmissions. There also at this time is no form of vaccine or treatment for infected cervids. Despite efforts being put forth to control CWD, being a free-range family of animals proves control to be extremely difficult.
Levy, Sharon. "A Plague of Deer." BioScience 56.9 (2006): 714-21. Encore. Web. 20 Jan. 2014.
In addition, Valley Fever has not received sufficient funding for research. Many milder cases go undiagnosed, which may mean that the reported cases are just the tip of the iceberg. The increase could be because of: • More people exposed to the fungus because of increased travel or relocation to the southwestern United States • Changes in the way cases of valley fever are being detected and reported to public health officials, or • Changes in factors such as temperature and rainfall, which can affect the growth of the fungus in the environment and how much of it is circulating in the air. There is no vaccine to protect against it and, in the most severe cases, no cure. The population of Phoenix has grown by ten per cent in the past decade, and newcomers have no acquired immunity.
Also considered as a hemorrhagic fever, MVD can affect both humans and animals, specifically those of primate species. The virus is classified as a unique strand – so unique that it is one of five in the same family to include that strand of the Ebola virus. The virus can contain as little as one strand to be contagious and can survive up to two weeks in blood specimens at room temperature. The incubation period, which is the time between exposure and when symptoms begin to appear in victims, is 2-21 days. Research suggests that the RNA strand is a filo-virus and that the highest inter-human transmission takes place from contact with body fluids or injections. Subcutaneous transmission also occurs especially when caring for an ailing loved one and/or disposing or pr...
The virus is primarily spherical shaped and roughly 200nm in size, surrounded by a host-cell derived membrane. Its genome is minus-sense single-stranded RNA 16-18 kb in length. It contains matrix protein inside the envelope, hemagglutinin and neuraminidase, fusion protein, nucleocapsid protein, and L and P proteins to form the RNA polymerase. The host-cell receptors on the outside are hemagglutinin and neuraminidase. The virus is allowed to enter the cell when the hemagglutinin/ neuraminidase glycoproteins fuse with the sialic acid on the surface of the host cell, and the capsid enters the cytoplasm. The infected cells express the fusion protein from the virus, and this links the host cells together to create syncitia.
Coyotes and bears are a common sight in the woods. These animals, along with others, are predators that help to control deer population but also decrease the amount of land allowed to the deer. In Western NC, deer rates have fallen and bag limits have been reduced. In Pennsylvania, biologists have conducted a lengthy study to determine fawn mortality and predation. Predators killed 46% of fawns, (Hart). A study about coyotes in Ohio found that even though they kill numerous fawns, the population of deer continues to grow, (Hart). It would be critical to maintain...
In the last decade, from the Rockies to New England and the Deep South, rural and suburban areas have been beset by white-tailed deer gnawing shrubbery and crops, spreading disease and causing hundreds of thousands of auto wrecks. But the deer problem has proved even more profound, biologists say. Fast-multiplying herds are altering the ecology of forests, stripping them of native vegetation and eliminating niches for other wildlife. ' 'I don 't want to paint deer as Eastern devils, ' ' said Dr. McShea, a wildlife biologist associated with the National Zoo in Washington, ' 'but this is indicative of what happens when an ecosystem is out of whack. ' ' The damage is worse than anyone expected, he and other scientists say. Higher deer densities have affected growth, survival, and reproduction of many plant species which have aesthetic, economic or ecological value. In some cases, many species of trees have also been shown to have reduced growth as a result of high deer density (Environmental Benefits of Hunting, 1). Deer prefer certain plant species over others and frequently feed on economically valuable tree species. For example, they prefer oak and sugar maple seedlings, as well as acorns, over less palatable species like American Beech and striped maple. Thus, less marketable species are more likely to survive to maturity,
Common animals that carry these diseases are rats, prairie dogs, and parrots (“Exotic Animals as Pets”). According to Live Science, a science news website, researchers have found that 13 zoonoses, which are diseases transmitted from animals, cause approximately 2.2 million human deaths per year. "From cyst-causing tapeworms to avian flu, zoonoses present a major threat to human and animal health," lead researcher Delia Grace, a veterinary epidemiologist. According to researchers, about 60% of all human diseases are zoonotic, meaning they come from animals. Most zoonotic human diseases come from livestock, such as pigs, chickens, cattle, goats, sheep, and camels (Bryner). If humans would not come into close contacts with animals there would not be as many diseases in the world which would result in less human and animal deaths. According to WebMD, an American corporation that provides health news, advice, and expertise, a very common zoonotic disease in the world today is influenza, also known as the flu. Influenza usually comes from ducks, geese, or pigs and then it spreads to chicken and pigs. Leptospirosis is another example of a human infection that comes from animals. Leptospirosis is caused by contact with water, food, or soil that has been contaminated with urine from infected animals. This infection can lead to liver failure, kidney damage, brain and spinal cord infection, and rarely, death
The Ebola Haemorrahagic Fever, or Ebola for short, was first recognized as a virus in 1967. The first breakout that caused the Ebola virus to be recognized was in Zaire with 318 people infected and 280 killed. There are five subtypes of the Ebola virus, but only four of them affect humans. There are the Ebola-Zaire, Ebola-Sudan, Ebola-Ivory Coast and the Ebola-Bundibugyo. The fifth one, the Ebola-Reston, only affects nonhuman primates. The Ebola-Zaire was recognized on August 26, 1976 with a 44 year old schoolteacher as the first reported case. The Ebola-Sudan virus was also recognized in 1976 and was thought to be that same as Ebola-Zaire and it is thought to have broken out in a cotton factory in the Sudan. The Ebola-Ivory Coast was first discovered in 1994 in chimpanzees in the Tia Forest in Africa. On November 24, 2007, the Ebola-Bundibugyo branch was discovered with an approximate total of 116 people infected in the first outbreak and 39 deaths. The Ebola-Reston is the only one of the five subtypes to not affect humans, only nonhuman primates. It first broke out in Reston, Virginia in 1989 among crab eating macaques.
Valley fever is transmitted when bacteria in the soil become airborne and are inhaled. California residents must understand the harmful effects of air pollution and make better choices when using energy or transportation. The drought conditions are worsening, but communities and individuals can work together to help improve the air quality. References California drought and air quality Santa Barbara County air pollution control district. (2015).
Although food borne outbreaks are sometimes seen with rotavirus and astrovirus, these viruses typically affect children as opposed to adults. The viruses at the highest risk for food borne transmission are norovirus and hepatitis A virus. The reasons may be due to their extreme stability in the environment and their highly infectious nature (Koopmans et al., 2002).
There are three genera in the Flaviviridae family (formerly known as group B arboviruses) namely Flavivirus, Pestivirus and Hepacivirus. The dengue virus is a member of the genus Flavivirus which consists of 55 identified virus species (ICTVdB, 2006). The word Flavi is a derivation from the Latin “flavus” which means “yellow” and the type species of the genus is a yellow fever virus (YFV). The flaviviruses are thus named due to the jaundice observed in yellow fever patients. Many flaviviruses are important human pathogens, most notably the dengue viruses, yellow fever virus, Japanese encephalitis virus (JEV), West Nile virus (WNV) and tick-borne encephalitis virus (TBEV). The flaviviruses are predominantly transmitted by mosquitoes and ticks, whereas some have no known vector. Dengue was one of the groups classified when early researchers divided the flaviviruses serologically into eight antigenic complexes using cross-neutralization tests. However, many viruses, for example the prototype of the genus YFV, could not be affiliated with any complexes (Calisher et al., 1989). When sequence data became available, phylogenetic inference from molecular data showed agreement with the antigenic complex classification. In addition, it revealed the ...