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    "textoCompleto" => "<p class="elsevierStylePara">The term &#34;imported diseases&#34; refers to infectious processes that are acquired in areas where they are more or less common but which are diagnosed and treated in places where they are not found or are extremely rare<span class="elsevierStyleSup">1</span>&#46; In clinical practice these diseases appear amongst two very different groups&#58; travelers coming back from underdeveloped countries and immigrants who come from those parts of the world&#46; The difference is an important one as the agents responsible for respiratory diseases tend to be different in each group&#46;</p><p class="elsevierStylePara">In Spain&#44; the detection of imported diseases has been rare but is becoming more common with the increase in tourism to exotic regions and particularly the rise in immigration&#46;</p><p class="elsevierStylePara"> There are approximately 1 000 000 immigrants from developing countries living in Spain &#40;700 000 legally and 300 000 illegally&#41;<span class="elsevierStyleSup">2</span>&#46; Likewise&#44; between 700 000 and 1 000 000 Spaniards<span class="elsevierStyleSup">3&#44;4</span> travel to underdeveloped countries where they may be exposed to pathogens&#46; Although imported diseases are rare in individual clinical practices&#44; the growth of both phenomena &#40;immigration and travel&#41; means that in general these diseases will be gradually included in the differential diagnosis of many clinical syndromes&#46;</p><p class="elsevierStylePara"> There are noninfectious agents that are known to affect the lungs more frequently in the tropics<span class="elsevierStyleSup">5</span> &#40;such as tobacco&#44; rheumatic cardiopathy&#44; pneumoconiosis or illnesses caused by organic dust&#41; and which must not be overlooked&#46; However&#44; the most common imported respiratory diseases are infections and conclusions can be drawn from a basic analysis&#58; <span class="elsevierStyleItalic">a&#41;</span> most infections detected in immigrants and&#44; to a lesser extent&#44; in travelers are caused by the same etiological agents that cause lung disease in the immigrants&#39; countries of origin&#59; <span class="elsevierStyleItalic">b&#41;</span> the main imported respiratory problem is tuberculosis&#44; and <span class="elsevierStyleItalic">c&#41;</span> some apparently &#34;exotic&#34; infections are already present in Spain&#44; although they are not well known&#46; We will comment briefly on the two last points&#46; Imported tuberculosis occurs mainly amongst immigrants though tuberculous infection is now found increasingly amongst travelers to high endemic countries both during their journeys<span class="elsevierStyleSup">6</span> and during longer stays<span class="elsevierStyleSup">7</span>&#46; Characteristics of tuberculosis in immigrants&#44; as opposed to tuberculosis in the local Spanish population<span class="elsevierStyleSup">8&#44;9</span>&#44; can be summarized as follows&#58; <span class="elsevierStyleItalic"> a&#41;</span> frequency is higher than in the local population &#40;approximately one in ten cases appears in an immigrant&#41;&#59; <span class="elsevierStyleItalic">b&#41;</span> the disease normally develops two to three years after the immigrant arrives in Spain&#59; <span class="elsevierStyleItalic">c&#41;</span> in general the disease is assumed to be an endogenous reactivation rather than an exogenous infection&#59; <span class="elsevierStyleItalic">d&#41;</span> extrapulmonary symptoms are more often present than with local forms of the disease&#59; <span class="elsevierStyleItalic">e&#41;</span> primary resistance is more common&#44; and <span class="elsevierStyleItalic">f&#41;</span> the characteristics of the immigrant population makes compliance with treatment and completion of adequate chemoprophylaxis more difficult&#46;</p><p class="elsevierStylePara"> With regard to &#34;exotic&#34; infections that are present in this country&#44; we will concentrate on three&#58; tularemia&#44; <span class="elsevierStyleItalic">Hantavirus</span> infection and strongyloidiasis&#46; Towards the end of the 1990&#39;s a serious outbreak of tularemia started in Castilla and Leon and spread to the neighboring autonomous regions<span class="elsevierStyleSup">10</span>&#46; Ulceroglandular presentation was the most common but a considerable number of cases had pneumonic symptoms<span class="elsevierStyleSup">11</span>&#46; With regard to <span class="elsevierStyleItalic">Hantavirus</span>&#44; studies of seroprevalence in Soria show that 2&#46;2&#37; of the population has had contact with these microorganisms<span class="elsevierStyleSup">12</span>&#44; and case reports have been published<span class="elsevierStyleSup">13</span>&#46; Finally&#44; the high prevalence of <span class="elsevierStyleItalic"> Strongyloides stercoralis</span> infection on the Mediterranean coast must not be overlooked&#44; as this helminth can cause pulmonary symptoms both during primary infection and in immunodepression<span class="elsevierStyleSup">14&#44;15</span>&#46;</p><p class="elsevierStylePara">We are going to discuss imported respiratory infections in the following sections&#46; One way of approaching the problem is by using classical business management analysis&#58; the SWOT matrix&#44; for strengths&#44; weaknesses&#44; opportunities and threats&#46; We will start with weaknesses&#44; followed by threats&#44; strengths and finally opportunities&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Weaknesses</span></p><p class="elsevierStylePara">The most obvious weakness is the lack of knowledge about many aspects of these diseases so we have outlined some ideas for treating them&#46; First&#44; it is essential to distinguish between acute and subacute or chronic diseases&#46; Acute diseases are characteristic of travelers whereas subacute or chronic diseases are found in immigrants<span class="elsevierStyleSup">16</span>&#46; The main acute imported diseases with pulmonary effects are accompanied by fever and can be divided into four main groups&#58; malaria<span class="elsevierStyleSup">17</span>&#44; typhoid<span class="elsevierStyleSup">18</span>&#44; rickettsiosis<span class="elsevierStyleSup">19</span> and tropical viruses<span class="elsevierStyleSup">20</span>&#46; Subacute diseases&#44; on the other hand&#44; include tuberculosis&#44; parasite infections and primary mycoses<span class="elsevierStyleSup">21</span>&#46; One disease that clearly shows the dichotomy between acute and chronic symptoms is schistosomiasis<span class="elsevierStyleSup">22&#44;23</span>&#46; In its acute form&#44; characteristic amongst travelers&#44; the clinical symptoms known as Katayama fever &#40;fever&#44; urticaria&#44; cough and transitory infiltrations&#41; depend on the immune response of the host&#44; whereas in the chronic form found in immigrants&#44; the respiratory manifestations &#40;dyspnea&#44; micronodular patterns and pulmonary hypertension&#41; depend on the embolization of eggs that have not been retained by the hepatic filter&#46; A second aspect of interest is knowledge of the exact geographic distribution of the potential diseases&#46; Thus Chagas&#39; disease&#44; for example&#44; can only be considered in the differential diagnosis of an immigrant coming from America&#44; and Loa loa infection is only found in a certain part of Africa&#46; In the third place&#44; it is important to know the immune status of the patient&#46; This is because of the higher prevalence of human immunodeficiency virus among immigrants&#44; and the possibility&#44; in this context&#44; of the reactivation of latent infections &#40;such as tuberculosis&#44; histoplasmosis or <span class="elsevierStyleItalic">Penicillium marneffei</span> infection&#41;<span class="elsevierStyleSup">21</span>&#46; Pulmonary manifestations may also develop when proximal organs are affected and this must be taken into account&#46; Thus&#44; the presence of megaesophagus in a case with Chagas&#39; disease can lead to aspiration pneumonia&#59; restricted myocardiopathy associated with filariasis can cause acute cardiogenic pulmonary edema&#59; or the penetration of <span class="elsevierStyleItalic">Paragonimus</span> sp&#46; through the diaphragm can cause a large pleural effusion<span class="elsevierStyleSup">24</span>&#46; Broadening the differential diagnosis is another practical measure that helps the interpretation of imported respiratory diseases&#46; For example&#44; when imported tuberculosis is suspected from clinical and radiological findings&#44; melioidosis<span class="elsevierStyleSup">25</span>&#44; primary mycosis<span class="elsevierStyleSup">26</span> and paragonimiasis<span class="elsevierStyleSup">24</span> should also be considered depending on the country of origin of the patient&#46; When dealing with imported pulmonary infections it is essential to know how and where to carry out specific complementary tests and obtain certain drugs&#46; A correct diagnosis of tropical eosinophilia not only requires confirmation of a prolonged stay in an endemic region and an eosinophil concentration greater than 3000&#47;&#181;L but absence of microfilariae must also be demonstrated&#44; antibodies to filariae found&#44; and response to diethylcarbamazine evaluated&#46; Consequently&#44; the microbiologist must have experience in reading a blood smear and carrying out a Knott test &#40;for the detection of microfilaremia&#41;<span class="elsevierStyleSup">27</span>&#46; However&#44; antibodies to filariae can only be detected in highly specialized centers and diethylcarbamazine is difficult to find &#40;as it is not available through either conventional channels or importers&#41;&#46; Finally&#44; in uncertain cases it is better to overtreat than to leave untreated parasitic infections like strongyloidiasis or filariasis because of the subsequent problems they can cause &#40;hyperinfection syndrome or cardiomyopathy&#44; respectively&#41;&#46; The low toxicity of antihelminthic drugs makes this decision easier to take&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Threats</span></p><p class="elsevierStylePara"> Although the possibilities of an outbreak of imported lung disease are theoretically high&#44; in clinical practice both the frequency and the causes of lung infection in immigrant groups are similar to those of the local population<span class="elsevierStyleSup">28</span>&#46; Furthermore&#44; the biological characteristics &#40;biological cycle&#44; reserves&#44; etc&#46;&#41; of the causal agents of these diseases make it difficult or even impossible for them to be transmitted to the local population&#44; considering present day conditions of hygiene and health care in Spain&#46; For this reason&#44; the biggest threat concerning imported pulmonary diseases&#44; with the exception of tuberculosis&#44; is of them going unrecognized in the groups mentioned above&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Strengths</span></p><p class="elsevierStylePara">The health care system in Spain is generally well prepared for the challenge of imported diseases&#44; with respect to both imaging and laboratory techniques and the information sources available&#46; Regarding this last aspect&#44; there are excellent reviews on the subject by authors from Spain<span class="elsevierStyleSup">29</span> as well as other countries<span class="elsevierStyleSup">16&#44;30-34</span>&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Opportunities</span></p><p class="elsevierStylePara">The current rate of immigration in Spain &#40;around 2&#46;5&#37;&#41; is well below that of other developed countries&#44; whether in Europe &#40;e&#46;g&#46;&#44; approximately 9&#37; in Austria or Germany&#41; or in other continents &#40;e&#46;g&#46;&#44; 17&#46;5&#37; in Canada or 22&#37; in Australia&#41;&#46; That means we have time enough to get to know these infections&#44; to gradually incorporate them into the diagnostic differential and to organize adequate treatment&#46;</p><hr></hr><p class="elsevierStylePara">Correspondence&#58; Prof Dr J&#46;L&#46; P&#233;rez Arellano&#46;<br></br> Departamento de Ciencias M&#233;dicas y Quir&#250;rgicas&#46; Centro de Ciencias de la Salud&#46; Universidad de Las Palmas de Gran Canaria&#46;<br></br> 35080 Las Palmas de Gran Canaria&#46; Spain&#46;<br></br> E-mail&#58; <a href="mailto&#58;arellano&#64;cicei&#46;ulpgc&#46;es" class="elsevierStyleCrossRefs"> arellano&#64;cicei&#46;ulpgc&#46;es</a></p><p class="elsevierStylePara">Manuscript received 22 October 2002&#46;<br></br> Accepted for publication&#58; 29 October 2002&#46;</p>"
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Imported respiratory infections: new challenges and threats
Infecciones respiratorias importadas: nuevos retos y amenazas
JL. Pérez Arellanoa, C. Carranzab
a Unidad de Enfermedades Infecciosas y Medicina Tropical. Departamento de Ciencias Médicas y Quirúrgicas. Universidad de Las Palmas de Gran Canaria. Las Palmas de Gran Canaria. Spain.
b Departamento de Ciencias Médicas y Quirúrgicas. Universidad de Las Palmas de Gran Canaria. Las Palmas de Gran Canaria. Spain.
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    "textoCompleto" => "<p class="elsevierStylePara">The term &#34;imported diseases&#34; refers to infectious processes that are acquired in areas where they are more or less common but which are diagnosed and treated in places where they are not found or are extremely rare<span class="elsevierStyleSup">1</span>&#46; In clinical practice these diseases appear amongst two very different groups&#58; travelers coming back from underdeveloped countries and immigrants who come from those parts of the world&#46; The difference is an important one as the agents responsible for respiratory diseases tend to be different in each group&#46;</p><p class="elsevierStylePara">In Spain&#44; the detection of imported diseases has been rare but is becoming more common with the increase in tourism to exotic regions and particularly the rise in immigration&#46;</p><p class="elsevierStylePara"> There are approximately 1 000 000 immigrants from developing countries living in Spain &#40;700 000 legally and 300 000 illegally&#41;<span class="elsevierStyleSup">2</span>&#46; Likewise&#44; between 700 000 and 1 000 000 Spaniards<span class="elsevierStyleSup">3&#44;4</span> travel to underdeveloped countries where they may be exposed to pathogens&#46; Although imported diseases are rare in individual clinical practices&#44; the growth of both phenomena &#40;immigration and travel&#41; means that in general these diseases will be gradually included in the differential diagnosis of many clinical syndromes&#46;</p><p class="elsevierStylePara"> There are noninfectious agents that are known to affect the lungs more frequently in the tropics<span class="elsevierStyleSup">5</span> &#40;such as tobacco&#44; rheumatic cardiopathy&#44; pneumoconiosis or illnesses caused by organic dust&#41; and which must not be overlooked&#46; However&#44; the most common imported respiratory diseases are infections and conclusions can be drawn from a basic analysis&#58; <span class="elsevierStyleItalic">a&#41;</span> most infections detected in immigrants and&#44; to a lesser extent&#44; in travelers are caused by the same etiological agents that cause lung disease in the immigrants&#39; countries of origin&#59; <span class="elsevierStyleItalic">b&#41;</span> the main imported respiratory problem is tuberculosis&#44; and <span class="elsevierStyleItalic">c&#41;</span> some apparently &#34;exotic&#34; infections are already present in Spain&#44; although they are not well known&#46; We will comment briefly on the two last points&#46; Imported tuberculosis occurs mainly amongst immigrants though tuberculous infection is now found increasingly amongst travelers to high endemic countries both during their journeys<span class="elsevierStyleSup">6</span> and during longer stays<span class="elsevierStyleSup">7</span>&#46; Characteristics of tuberculosis in immigrants&#44; as opposed to tuberculosis in the local Spanish population<span class="elsevierStyleSup">8&#44;9</span>&#44; can be summarized as follows&#58; <span class="elsevierStyleItalic"> a&#41;</span> frequency is higher than in the local population &#40;approximately one in ten cases appears in an immigrant&#41;&#59; <span class="elsevierStyleItalic">b&#41;</span> the disease normally develops two to three years after the immigrant arrives in Spain&#59; <span class="elsevierStyleItalic">c&#41;</span> in general the disease is assumed to be an endogenous reactivation rather than an exogenous infection&#59; <span class="elsevierStyleItalic">d&#41;</span> extrapulmonary symptoms are more often present than with local forms of the disease&#59; <span class="elsevierStyleItalic">e&#41;</span> primary resistance is more common&#44; and <span class="elsevierStyleItalic">f&#41;</span> the characteristics of the immigrant population makes compliance with treatment and completion of adequate chemoprophylaxis more difficult&#46;</p><p class="elsevierStylePara"> With regard to &#34;exotic&#34; infections that are present in this country&#44; we will concentrate on three&#58; tularemia&#44; <span class="elsevierStyleItalic">Hantavirus</span> infection and strongyloidiasis&#46; Towards the end of the 1990&#39;s a serious outbreak of tularemia started in Castilla and Leon and spread to the neighboring autonomous regions<span class="elsevierStyleSup">10</span>&#46; Ulceroglandular presentation was the most common but a considerable number of cases had pneumonic symptoms<span class="elsevierStyleSup">11</span>&#46; With regard to <span class="elsevierStyleItalic">Hantavirus</span>&#44; studies of seroprevalence in Soria show that 2&#46;2&#37; of the population has had contact with these microorganisms<span class="elsevierStyleSup">12</span>&#44; and case reports have been published<span class="elsevierStyleSup">13</span>&#46; Finally&#44; the high prevalence of <span class="elsevierStyleItalic"> Strongyloides stercoralis</span> infection on the Mediterranean coast must not be overlooked&#44; as this helminth can cause pulmonary symptoms both during primary infection and in immunodepression<span class="elsevierStyleSup">14&#44;15</span>&#46;</p><p class="elsevierStylePara">We are going to discuss imported respiratory infections in the following sections&#46; One way of approaching the problem is by using classical business management analysis&#58; the SWOT matrix&#44; for strengths&#44; weaknesses&#44; opportunities and threats&#46; We will start with weaknesses&#44; followed by threats&#44; strengths and finally opportunities&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Weaknesses</span></p><p class="elsevierStylePara">The most obvious weakness is the lack of knowledge about many aspects of these diseases so we have outlined some ideas for treating them&#46; First&#44; it is essential to distinguish between acute and subacute or chronic diseases&#46; Acute diseases are characteristic of travelers whereas subacute or chronic diseases are found in immigrants<span class="elsevierStyleSup">16</span>&#46; The main acute imported diseases with pulmonary effects are accompanied by fever and can be divided into four main groups&#58; malaria<span class="elsevierStyleSup">17</span>&#44; typhoid<span class="elsevierStyleSup">18</span>&#44; rickettsiosis<span class="elsevierStyleSup">19</span> and tropical viruses<span class="elsevierStyleSup">20</span>&#46; Subacute diseases&#44; on the other hand&#44; include tuberculosis&#44; parasite infections and primary mycoses<span class="elsevierStyleSup">21</span>&#46; One disease that clearly shows the dichotomy between acute and chronic symptoms is schistosomiasis<span class="elsevierStyleSup">22&#44;23</span>&#46; In its acute form&#44; characteristic amongst travelers&#44; the clinical symptoms known as Katayama fever &#40;fever&#44; urticaria&#44; cough and transitory infiltrations&#41; depend on the immune response of the host&#44; whereas in the chronic form found in immigrants&#44; the respiratory manifestations &#40;dyspnea&#44; micronodular patterns and pulmonary hypertension&#41; depend on the embolization of eggs that have not been retained by the hepatic filter&#46; A second aspect of interest is knowledge of the exact geographic distribution of the potential diseases&#46; Thus Chagas&#39; disease&#44; for example&#44; can only be considered in the differential diagnosis of an immigrant coming from America&#44; and Loa loa infection is only found in a certain part of Africa&#46; In the third place&#44; it is important to know the immune status of the patient&#46; This is because of the higher prevalence of human immunodeficiency virus among immigrants&#44; and the possibility&#44; in this context&#44; of the reactivation of latent infections &#40;such as tuberculosis&#44; histoplasmosis or <span class="elsevierStyleItalic">Penicillium marneffei</span> infection&#41;<span class="elsevierStyleSup">21</span>&#46; Pulmonary manifestations may also develop when proximal organs are affected and this must be taken into account&#46; Thus&#44; the presence of megaesophagus in a case with Chagas&#39; disease can lead to aspiration pneumonia&#59; restricted myocardiopathy associated with filariasis can cause acute cardiogenic pulmonary edema&#59; or the penetration of <span class="elsevierStyleItalic">Paragonimus</span> sp&#46; through the diaphragm can cause a large pleural effusion<span class="elsevierStyleSup">24</span>&#46; Broadening the differential diagnosis is another practical measure that helps the interpretation of imported respiratory diseases&#46; For example&#44; when imported tuberculosis is suspected from clinical and radiological findings&#44; melioidosis<span class="elsevierStyleSup">25</span>&#44; primary mycosis<span class="elsevierStyleSup">26</span> and paragonimiasis<span class="elsevierStyleSup">24</span> should also be considered depending on the country of origin of the patient&#46; When dealing with imported pulmonary infections it is essential to know how and where to carry out specific complementary tests and obtain certain drugs&#46; A correct diagnosis of tropical eosinophilia not only requires confirmation of a prolonged stay in an endemic region and an eosinophil concentration greater than 3000&#47;&#181;L but absence of microfilariae must also be demonstrated&#44; antibodies to filariae found&#44; and response to diethylcarbamazine evaluated&#46; Consequently&#44; the microbiologist must have experience in reading a blood smear and carrying out a Knott test &#40;for the detection of microfilaremia&#41;<span class="elsevierStyleSup">27</span>&#46; However&#44; antibodies to filariae can only be detected in highly specialized centers and diethylcarbamazine is difficult to find &#40;as it is not available through either conventional channels or importers&#41;&#46; Finally&#44; in uncertain cases it is better to overtreat than to leave untreated parasitic infections like strongyloidiasis or filariasis because of the subsequent problems they can cause &#40;hyperinfection syndrome or cardiomyopathy&#44; respectively&#41;&#46; The low toxicity of antihelminthic drugs makes this decision easier to take&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Threats</span></p><p class="elsevierStylePara"> Although the possibilities of an outbreak of imported lung disease are theoretically high&#44; in clinical practice both the frequency and the causes of lung infection in immigrant groups are similar to those of the local population<span class="elsevierStyleSup">28</span>&#46; Furthermore&#44; the biological characteristics &#40;biological cycle&#44; reserves&#44; etc&#46;&#41; of the causal agents of these diseases make it difficult or even impossible for them to be transmitted to the local population&#44; considering present day conditions of hygiene and health care in Spain&#46; For this reason&#44; the biggest threat concerning imported pulmonary diseases&#44; with the exception of tuberculosis&#44; is of them going unrecognized in the groups mentioned above&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Strengths</span></p><p class="elsevierStylePara">The health care system in Spain is generally well prepared for the challenge of imported diseases&#44; with respect to both imaging and laboratory techniques and the information sources available&#46; Regarding this last aspect&#44; there are excellent reviews on the subject by authors from Spain<span class="elsevierStyleSup">29</span> as well as other countries<span class="elsevierStyleSup">16&#44;30-34</span>&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Opportunities</span></p><p class="elsevierStylePara">The current rate of immigration in Spain &#40;around 2&#46;5&#37;&#41; is well below that of other developed countries&#44; whether in Europe &#40;e&#46;g&#46;&#44; approximately 9&#37; in Austria or Germany&#41; or in other continents &#40;e&#46;g&#46;&#44; 17&#46;5&#37; in Canada or 22&#37; in Australia&#41;&#46; That means we have time enough to get to know these infections&#44; to gradually incorporate them into the diagnostic differential and to organize adequate treatment&#46;</p><hr></hr><p class="elsevierStylePara">Correspondence&#58; Prof Dr J&#46;L&#46; P&#233;rez Arellano&#46;<br></br> Departamento de Ciencias M&#233;dicas y Quir&#250;rgicas&#46; Centro de Ciencias de la Salud&#46; Universidad de Las Palmas de Gran Canaria&#46;<br></br> 35080 Las Palmas de Gran Canaria&#46; Spain&#46;<br></br> E-mail&#58; <a href="mailto&#58;arellano&#64;cicei&#46;ulpgc&#46;es" class="elsevierStyleCrossRefs"> arellano&#64;cicei&#46;ulpgc&#46;es</a></p><p class="elsevierStylePara">Manuscript received 22 October 2002&#46;<br></br> Accepted for publication&#58; 29 October 2002&#46;</p>"
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