There are many diseases that have a severe economic impact on countries and can even unbalancing the world economy when large outbreaks occur worldwide, these diseases have become mandatory reporting to the laws in many countries for the above reason, because they cause high mortality, low very severe and become processed human beings productivity is one of those diseases the paramyxovirus as distemper or measles in canids in primates, this disease share the same characteristics of his family, ie it tends to present an affinity to all body cells, so it is called pantotrópicos, which has a name that will not go unnoticed in people, is called disease newcastle. this avian paramyxovirus is a virus arn as genetic material, which is spread from sick birds, the which expel the virus from sneezes with drops of saliva and mucus, but also is excreted in the faeces, entering the airway system or digestive tract, where the virus attaches to red blood cells to reach the cells of different organs, where it will have an incubation period of 2 to 15 days, with a high rate of infection reaching 100% independiemente if strains are nonpathogenic, low pathogenicity or highly damaging, indeed the people, vehicles and different objects such as drinking fountains, Feeders and other things can serve as fomites to transport disease shed to shed, henhouse to henhouse and even to other farms. this disease has different types of presentations, it depends on the strain infecting the flock, which can be divided into 4 types, lentogenic, mesogenic, Velogenic and Velogenic Viscerotropic, It is the last 2 which can cause high mortality; all show signs in the respiratory tract, such as sneezing, tracheal rales and bronchial, difficulty breathing, cyanosis and crest in the case of cocks and conjunctivitis, but the most aggressive presentations triggers diarrhea and an emerald green hue Neurologic presentation as incoordination, involuntary eye movement, paralysis, torticollis and twitches, this because velogenic strains have an affinity the nervous system of birds, in terms of production ocaciona malformation the egg shells or lack of it, until reaching zero output egg. in fact a way to easily identify, is bird watching they have twisted his head, as if trying to see the sky turning his head. as soon as at necropsy lesions in the trachea is seen as haemorrhages, as in the abdomen and digestive system triggered a peritonitis. for diagnosis it is necessary to do it quickly, so by detecting first symptoms must take action, while a definitive diagnosis confirmed by isolation of the causative agent and inmunofluorescenica, the latter does not allow determine the strain, but the presence of the disease. Unfortunately being a virus you can not give them a direct treatment against these, but if prevent infection giving secondary antibiotics for the immune system has a higher percentage to react to the infection, but even in many cases mortality can be very high. so the main form of prevention is to provide a nasal vaccine against this disease, which is made from a dead or inactivated virus, this can reduce mortality, which should be applied on a calendar vaccination by determining the time where the disease is more common and its application in new birds entering the farm, and build farms far apart other, clean and disinfect the premises when flocks are taken to the market before introducing a new production cycle, keeping birds of a single age group and from the same source, that staff do not work on other facilities outside the company and before entering clean your clothes, disinfect their shoes, tires of vehicles, transport crates and equipment used for the entire project and most importantly prevent entry of wild birds because they tend to be the major source of infection, to get birds from other countries is why it they are quarantined and must isolate birds testing positive to this, especially on farms. often when presented in an installation, in many Sometimes proceed with the slaughter of birds to prevent the spread, where many times if the authorities conclude, it should be to sacrifice throughout the house or farm, using this sanitary rifle to prevent an epidemic in the region. It is a disease that is present throughout the world, and from Mexico to Argentina, Most strains are velogenic Viscerotropic. they may have all birds from chickens, turkeys and pigeons poultry production would be like birds ornamental like canaries, peacocks, parrots, birds of prey like hawks to eagles and owls, as well as through wild and migratory birds, including sparrows, ducks, geese, gulls, but depending on the species they may be more resistant to this. Being human can spread of this disease, but only causes symptoms conjunctivitis, in fact I met a person who to vaccinate pigeons he fell part of the vaccine in triggering eye conjunctivitis, so it is considered a zoonosis, but unlike birds does not cause mortality. a disease that can take many lives of birds, either by infection or suspicion of having it, causing a loss of millions of dollars where many people not know, causing terrible symptoms, that is the newcastle. 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