Diseases caused by virus in humans pdf merge

They can be temporary or permanent, and may be painless or painful. Assessing the epidemic potential of rna and dna viruses. Common symptoms include sudden fever, chills, diarrhea, joint pain and gradual weakness. Vaccines are also useful in preventing the spread of bacterial diseases.

Common diseases of tomatoes part ii diseases caused by. Diseases of sunflowers in south texas although more than 30 diseases of sunflowers have been documented worldwide, only a handful of those diseases are ever seen in the production areas in the gulf coast, coastal bend and lower rio grande valley of texas. Virus diseases in man include smallpox and chicken pox, measles, herpes, influenza, german measles, mumps, poliomyelitis, viral hepatitis, endemic encephalitis transmitted by ticks, mosquitoes, and other insects, trachoma, and. If this association can be confirmed it is the first known case of disease caused by a virus previously considered pathogenic only to plants. The natural reservoir host of ebola virus remains unknown. The very name virus stems from the concept of poison or illness, which appears to move through the air. New species of human virus are still being identified, at a rate of three or four per year see below, and viruses make up over twothirds of all new human. It is a contagious disease, whose symptoms include high fever, neck stiffness, nausea, vomiting, and drowsiness. Aids is real of course, but its not caused by any particular virus. Virus diseases cannot be diagnosed on the basis of symptoms alone. The eia virus is mechanically transmitted from one horse to another by the bloodsucking horse flies, deer flies tabanus, stable flies stomoxys spp. There are many features in the pdf that can be used in malicious ways without exploiting a. As for proving that a virus causes a disease, thats another level of goalpost moving altogether, since we all know if we are sick, but luckily we only have to take the word of some expert that there is a virus present. Learn diseases biology by bacteria viruses with free interactive flashcards.

Only proper hygiene and care can help prevent these diseases. It affects the fluid surrounding the brain exposing it to the deadly meningitis caused by virus. An early description of the plague of athens was written by thucydides, this plague was likely due to a viral epidemic. Level 1 represents the exposure of humans to a novel pathogen. Instead, aids is caused by an extremely weakened immune system from recreational drugs to enhance deviant sex, too many antibiotics and other legal drugs, venereal diseases especially from sodomitedeviant sex with many partners over time, and a poor diet in general. It is caused by the bacterium francisella tularensis and found in animals like rodents. Tularemia is a potentially serious illness that occurs naturally in north america. Full text full text is available as a scanned copy of the original print version. As a consequence different viruses found suitable conditions to thrive and establish longlasting associations with man.

Pdf antibodies against bluetongue virus were detected in cattle, sheep, goats, and camels in algeria in 2008. The fifth, reston virus reston ebolavirus, has caused disease in nonhuman primates, but not in humans. This pathogen is inhaled into the lungs, where its growth triggers an immune response that can destroy large areas of. Centers for disease control and prevention office of minority health.

Human diseases pdf download notes for ssc cgl 2017,upsc,nda. Pdf viral diseases and human evolution researchgate. The established natural reservoirs of human viruses are mainly farm animals, and, to a lesser extent. The emergence of these and many other human diseases occurred when an. The source of viruses of interest is most likely to be other mammals or birds see above and exposure implies any route by which a particular viral infection might be acquired, whether by contact with blood, saliva or faeces. Pages in category diseases caused by viruses the following 46 pages are in this category, out of 46 total. Outbreak of novel coronavirus disease 2019 covid19. Horses may be affected by the hendra virus that is highly contagious and fatal. It is hoped that several other viruses, such as polio and measles, will follow. More attention should be given to this virus in europe where surveillance has been focused mostly on puumala and dobravabelgrade hantaviruses. We report detection of seoul virus in 3 patients in france over a 2year period. Some of the more important diseases, such as sclerotinia head rot, do not. The lyssaviruses of rhabdoviridae are zoonotic human pathogens that cause fatal encephalitic disease.

Learn vocabulary, terms, and more with flashcards, games, and other study tools. Please use one of the following formats to cite this article in your essay, paper or report. This list is very important for one day exams and upsc exams. Crossspecies virus transmission and the emergence of new. Diseases and causing agent prelims questions, questions. We do not have the detailed knowledge of the physiology, genetics, metabolism and structure of viruses to classify them according to evolutionary development as has been done with the larger microorganisms e. Lucas and nelson combine to provide an equally com. Diagnosing infection with small ruminant lentiviruses of genotypes a and b by combining synthetic pe. Stuartharris the first of two croonian lectures delivered before the royal college of physicians of london on march and 15, 1962.

There are many types of viruses that cause a wide variety of viral diseases. Human diseases pdf download notes for ssc cgl 2017,upsc,nda,cds a. For example, the avian influenza virus originates in birds, but can cause disease in humans. Many new and emerging rna and dna viruses are zoonotic or have zoonotic origins in an animal reservoir that is usually mammalian and sometimes avian. Viral diseases can be prevented from spreading by vaccinations and the most successful of these is the small pox vaccine that has completely eradicated the disease in 1980. Chemical control strategies that may be required are updated annually in the osu extension agents handbook of insect, plant disease and weed control circular e832. Remove all weeds since these may harbor both viruses and insects. Viruses exist almost everywhere, such like in the air, soil and animal body. It can be transferred to humans by an infected flea or tick bite. Here presented the list of diseases caused by bacteria and viruses in humans. Usually vaccines are made of weakened virus, which will not cause disease.

Some cancers are caused by substances in the environment. Human immune system can generate antibodies against viruses, the antibody will recognize the virus and destroy it. List of diseases caused by bacteria and viruses in humans. While some of them are easily preventable and curable, some can prove to be fatal if not diagnosed and treated on time. The prognosis of such a mutation depends on the cause that caused it. In it he carefully describes the epidemic that hit athens in 430 bc. People can reduce their risk of getting cancer by limiting their exposure to these harmful agents. Human body also harbors a lot of viruses, but most of them do not cause diseases. Following on from the discovery of tobacco mosaic virus in 1892 and footandmouth disease virus in 1898, the first filterable agent to be discovered in humans was yellow fever virus in 1901. Influenza a virus, influenza b virus, and influenza c virus, respectively table 10. The number of diseases caused by viruses, is probably lesser than only the number of species of viruses. Viral disease is usually detected by clinical presentation, for instance severe muscle and joint pains preceding fever, or skin rash and swollen lymph glands. Most human infections in world today are either caused by viruses or bacteria. Choose from 500 different sets of diseases biology by bacteria viruses flashcards on quizlet.

A virus is micro organism, it is usually very difficult to kill. Reverse zoonoses are caused by infection of an animal by a virus that originated in a human. One example of a bacterial pathogen that damages host tissue is the bacterium that causes tuberculosis. Bacterial diseases bacteria are microscopic, singlecelled organisms bacte. The most common diseases caused by viruses include ebola, influenza, yellow fever, human immunodeficiency virus hiv aids, human papillomavirus hpv, viral gastroenteritis, varicella, and viral hepatitis, among others. List human diseases caused by bacteria, virus, fungi, and protozoa hello friends welcome to. Skin disorders vary greatly in symptoms and severity. These patients accounted for 3 of the 4 seoul virus infections among 434 hantavirus infections 1. More than twothirds of human viruses can also infect nonhuman hosts. List human diseases caused by bacteria, virus, fungi, and protozoa. Emerging tropical viruses have caused serious outbreaks during the recent years, such as ebola virus ebov in 2014 and the most recent in 201819 in congo. The fatal illness caused is by hiv human immunodeficiency virus. Equine infectious anaemia eia, also known as swamp fever is a horse disease caused by a retrovirus and transmitted by bloodsucking insects.

Chimerism in humans is a different genetic code in one organism. Viruses cause a wide range of human diseases, ranging from acute self resolving conditions to acute. Infections and infectious diseases whoeurope world health. Humans serve as reservoir and source transmitted by skin contact and respiratory droplets. Virus diseases article about virus diseases by the free. The field of phylodynamics, combining a modeling framework for host. Diseases and causing agent, the prominence of general science can be seen from the number of questions asked in previous years, questions from general science in upsc prelims. The best way to protect yourself from bacteria and other germs is to properly wash and dry your hands often. Not all zoonotic viruses are transmissible directly or by an arthropod vector between human hosts. Most people get infected with one or more of these viruses at some point in their lives. Printer friendly version pdf icon pdf common human coronaviruses, including types 229e, nl63, oc43, and hku1, usually cause mild to moderate upperrespiratory tract illnesses, like the common cold. Tuberculosis is one of the most common and widely distributed bacteria diseases in the human population. And the virus specific information can be remembered by the immune system, sometimes through the whole life. The lines of evidence described earlier combine to suggest the following.

Some have situational causes, while others may be genetic. It is caused by bacteria called mycobacterium tuberculosis and mostly infects bones, lungs, brain, and the abdomen. Viruses are very tiny organisms with their diameters in nanometers level. Discussion of viral diseases caused by specific families of viruses. The most common type of viral disease is the common cold, which is caused by a viral infection of the upper respiratory tract nose and throat. They are caused by some genetic abnormality or metabolic disorder or malfunctioning of an organ.

If it is a blood chimera, then during a lifetime a person may never know that he has two sets of dna. Get a printable copy pdf file of the complete article 116k, or click on a page image below to browse page by page. However, on the basis of available evidence and the nature of similar viruses, researchers believe that the virus is zoonotic animalborne with bats being the most likely reservoir. How do human diseases caused by bacteria and diseases caused by viruses react to antibiotics. Later, affected cells merge forming a focus of granular, amorphous or hyaline material. Scrapie is most likely caused by pathogens known as viroids. Viral diseases are extremely widespread infections caused by viruses, a type of microorganism. Fortunately for us, most viral host transfers to infect the new hosts cause only single. Slight genetic changes would be needed for the bird flu virus to become infectious to humans. Pdf and viruses it also means that one can embed a virus inside a pdf document. Viruses that can be transmitted from an animal host to a human host can cause zoonoses.