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By nature of the infection, none have been directly associated with laboratory animals, with the exception of infected mollusk intermediate hosts. Most laboratory exposures to schistosomes would result in predictably low worm burdens with minimal disease potential. Natural Modes of Infection Fasciola hepatica has a cosmopolitan distribution and is most common in sheepraising areas, although other natural hosts include goats, cattle, hogs, deer, and rodents. Schistosoma mansoni is widely distributed in Africa, South America, and the Caribbean; the prevalence of infection has been rapidly changing in some areas. Infection occurs when persons are exposed to free-swimming cercariae in contaminated bodies of water; cercariae can penetrate intact skin. Ingestion of fluke metacercariae and skin penetration by schistosome cercariae are the primary laboratory hazards. Dissection or crushing of schistosome-infected snails may also result in exposure of skin or mucous membrane to cercariae-containing droplets. Additionally, metacercariae may be inadvertently transferred from hand to mouth by fingers or gloves, following contact with contaminated aquatic vegetation or aquaria. Gloves should be worn when there may be direct contact with water containing cercariae or vegetation with encysted metacercariae from naturally or experimentally infected snail intermediate hosts. Long-sleeved laboratory coats or other protective garb should be worn when working in the immediate area of aquaria or other water sources that may contain schistosome cercariae. Water from laboratory aquaria containing snails and cercariae should be decontaminated before discharged to sanitary sewers. Humans serve as intermediate hosts and harbor the metacestode or larval stage, which produces a hydatid cyst. Hymenolepis nana, the dwarf tapeworm, is cosmopolitan in distribution and produces hymenolepiasis, or intestinal infection with the adult tapeworm. Taenia solium, the pork tapeworm, causes both taeniasis (infection of the intestinal tract with the adult worm), and cysticercosis (infection of subcutaneous, intermuscular, and central nervous system with the metacestode stage or cysticercus). Occupational Infections No laboratory-acquired infections have been reported with any cestode parasite. Natural Modes of Infection the infectious stage of Echinococcus, Hymenolepis, and Taenia is the oncosphere contained within the egg. Hymenolepis nana is a one-host parasite and does not require an intermediate host; it is directly transmissible by ingestion of feces of infected humans or rodents. Canids, including dogs, wolves, foxes, coyotes, and jackals, are the definitive hosts for E. Bush dogs and pacas serve as the definitive and intermediate hosts, respectively, for E. Echinococcus oligarthrus uses wild felines, including cougar, jaguarondi, jaguar, ocelot, and pampas cat, as definitive hosts and various rodents such as agoutis, pacas, spiny rats, and rabbits serve as intermediate hosts.

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Rattle segments When spring temperatures are favorable, rattlesnakes are interconnected with a single segment being proemerge from their dens to search for food, at which duced each time the snake molts. It was previously time they are unusually pugnacious, aggressive, and thought that a segment was added for each year of the dangerous. In reality, rattlesnakes do not necessarily during the day, gradually shifting to greater nocturnal molt only once a year, but may shed their skin up to activity as seasonal temperatures increase. Unlike most reptiles that reproduce by hatching young from eggs (oviparous) deposited in the environment, Ecology rattlesnakes produce live young (ovoviviparous). Litters usually mobility and physiological activities associated with consist of 4-15 young that are born during the summer feeding, digestion, and reproduction. The ambient conditions, rattlesnakes are normally active female reproductive system is equipped with specialduring the warmer months of the year and will hiberized sperm storage vesicles that are capable of sustainnate during the colder months between late fall and ing viable sperm for long periods between matings and early spring. Mature females normally produce at least rattlesnakes vary geographically according to climatic one litter per year, but at northern latitudes or in mounregions;. Towards the tail, the blotches narrow to ish with distinct diamond-shaped to hexagonal blotches cross bands that contrast with the lighter ground color mottled with dark scales and outlined with lighter con(background color) of the body. Smaller blotches of dark scales are tinctive stripe extending from behind the eye to the present along the sides between the larger dorsal corner of the mouth. Colors range from cream to yellow, pink, gray, Distinguishing Characteristics: Tail marked with broad greenish, brown, and black. Coastal and mountain black and white or light gray rings of equal width that populations tend to be darker than desert populations. Distinguishing Characteristics: More than two interRange: Eastern deserts from northern San Bernardino nasal scales touching the rostral (nose) scale. Habitat: the Western diamondback is found in rocky Distributed throughout much of the state except the and sandy desert areas where its overall ground colOwens Valley, Mojave and Colorado Deserts. This species is east side of the Sierra Nevadas and Modoc Plateau to more pugnacious than other rattlesnakes and will hold the Oregon border, and 3) Southern Pacific rattlesnake its ground when disturbed. Habitat: the Western rattlesnake frequents a variety of habitats, from shrub-covered coastal dunes and valley grasslands to timberline in the Sierra Nevada. Most often encountered on rocky outcrops, talus slopes, stream courses, and ledges. Body colors include cream, tan, and pink cream, gray, yellowish, tan, pink, brown and black.

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To prevent support with dopamine, vasopressin, or dobutamine decompensation of homeostatic mechanisms, therapy may be required to maintain adequate ventricular permust be promptly administered. Control of ongoing hemorhas been controlled and the patient has stabilized, rhage requires immediate attention. Early stabilization of blood transfusions should not be continued unless the fractures, debridement of devitalized or contaminated hemoglobin is <fi7 g/dL. Studies have demonstrated an tissues, and evacuation of hematomata all reduce the increased survival in patients treated with this restricsubsequent infiammatory response to the initial insult tive blood transfusion protocol. SuppleSuccessful resuscitation also requires support of resmentation of depleted endogenous antioxidants also piratory function. Supplemental oxygen should be proreduces subsequent organ failure and mortality. With compression, the heart and surrounding structures are less compliant, and thus normal filling pressures generate inadequate diastolic filling. Shock after trauma is, in large measure, due to hypovAny cause of increased intrathoracic pressure, such as olemia. However, even when hemorrhage has been contension pneumothorax, herniation of abdominal viscera trolled, patients can continue to have a loss of plasma through a diaphragmatic hernia, or excessive positive presvolume into the interstitium of injured tissues. These sure ventilation to support pulmonary function, can also fiuid losses are compounded by injury-induced infiamcause compressive cardiogenic shock while simultaneously matory responses, which contribute to the secondary impeding venous return. Although initially responsive to increased filling pressures produced by volume expansion, insufficiency complicates the host response to the stress 275 as compression increases, cardiogenic shock recurs. Adrenocortical window of opportunity gained by volume loading may be insufficiency may occur as a consequence of the chronic very brief until irreversible shock recurs. Diagnosis and administration of high doses of exogenous glucocortiintervention must occur urgently. In addition, recent studies have shown that critical the diagnosis of compressive cardiogenic shock is illness, including trauma and sepsis, may also induce a relamost frequently based on clinical findings, the chest raditive hypoadrenal state. The diagnosis of comadrenal insufficiency secondary to idiopathic atrophy, pressive cardiac shock may be more difficult to establish tuberculosis, metastatic disease, bilateral hemorrhage, and in the setting of trauma when hypovolemia and cardiac amyloidosis. The shock produced by adrenal insufficiency compression are present simultaneously. The diaghypotension, neck vein distention, and muffied heart nosis of adrenal insufficiency may be established by means sounds. The diagnosis is confirmed by echocardiography, and treatment consists of immediate pericardiocentesis. This agent is preferred if empiric therapy is required diaphragm of the affected hemithorax, and shifting of because, unlike hydrocortisone, it does not interfere the mediastinum to the contralateral side. Release of air absolute or relative adrenal insufficiency is established and restoration of normal cardiovascular dynamics are as shown by nonresponse to corticotropin stimulation both diagnostic and therapeutic. In addition to arteriolar and norepinephrine are widely used in the treatment of dilatation, venodilation causes pooling in the venous sysall forms of shock. Dobutamine is inotropic with simultatem, which decreases venous return and cardiac output.

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This may necessitate extra equipment and supplies wear a mask, have limited contact with family members, and dedicated for use in the isolation area. Patients infectious with measure their temperatures twice a day) and/or work quarantine. Furthermore, the quarantine period was necessarunits and a large infectious disease disaster may require cohortily10days,arelativelylongtimeformostpeopletobeawayfrom ing multiple patients in the same room or even the establishment work and community activities. DurFor this pandemic, it was not necessary to close borders ing other types of large disasters, patients are often transferred (within and/or between nations) to general travel. Issuestoconsiderareenforcement,theeffectonbusinesses, May Be Due to a Bioterrorist Attack and the effect on the supply chain for disaster management. Agent the disease or agent is not usually seen in the region Whether or not movement or quarantine measures are. Note: unintentional food-borne outbreaks may display this incidence pattern if the contaminated product is Ethics and Law widely distributed. There are many ethical and legal considerations in the manGenetically engineered to be resistant to multiple agement of an infectious disease disaster. The following issues antibiotics, particularly those commonly used to treat are illustrative:33 disease. Genetically engineered to cause a novel disease for that the process of making population-based decisions for infecagent. Criteria include most of those already described, of the agent follow wind trajectories. Department of Agriculture, Animal and Plant Health Inspection Service jointly administer the Federal Select More than one outbreak (with potentially larger numbers than usual) in a region caused by different Agent Program, which maintains and oversees use of a list of agents, especially if one or more agents is uncommon. A bioterrorist may use an agent that fi More than one indication may be present after an attack. Indications has been genetically engineered to be highly virulent, resistant to therapeutics, and/or to cause a novel disease. In these cases, listed do not necessarily mean a bioterror attack has occurred, and health professionals will be at a further disadvantage to prevent should be substantiated with epidemiological and/or criminal investigations. As with every terrorist attack, a criminal investigation should ensue after a bioweapon is used. In other types of attacks, this investigation begins immediately after the actual incident has suspected. When a bioweapon is used, it may be days or longer intheregion,foulplaymaynotevenbesuspected.

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