Tropical medicine

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Sir Patrick Manson, considered the father of tropical medicine. Sir Patrick Manson. Wellcome L0025920.jpg
Sir Patrick Manson, considered the father of tropical medicine.
Tropical medicine physician
Occupation
Names
  • Physician
Occupation type
 Specialty
Activity sectors
 Medicine
Description
Education required
Fields of
employment
 Hospitals, clinics

Tropical medicine is an interdisciplinary branch of medicine that deals with health issues that occur uniquely, are more widespread, or are more difficult to control in tropical and subtropical regions. [1]

Contents

Physicians in this field diagnose and treat a variety of diseases and ailments. Most infections they deal with are endemic to the tropics. A few of the most well-known include malaria, HIV/AIDS, and tuberculosis. They must be knowledgeable in the 18 lesser known neglected tropical diseases, which include Chagas disease, rabies, and dengue. Poor living conditions in developing regions of tropical countries have led to a rising number of non-communicable diseases as well as the prevalence of neglected tropical diseases. These diseases include cancer and cardiovascular disease, which, in the past, have been more of a worry in developed countries. Physicians trained in tropical medicine must also be prepared to diagnose and treat these diseases. [1]

Training for physicians wishing to specialize in tropical medicine varies widely over the different countries. They must study epidemiology, virology, parasitology, and statistics, as well as the training required of an ordinary MD. Research on tropical diseases and how to treat them comes from both field research and research centers, including those of the military. [2]

Sir Patrick Manson is recognized as the father of tropical medicine. He founded the London School of Hygiene & Tropical Medicine in 1899. [3] He is credited with discovering the vector by which elephantiasis was being passed to humans. He learned it was a microscopic nematode worm called Filaria sanguinis hominis . He continued to study this worm and its life cycle and determined the worms underwent metamorphosis within female Culex fatigans mosquitoes. Thus he discovered mosquitoes as a vector for elephantiasis. After this discovery, he collaborated with Ronald Ross to examine the transmission of malaria via mosquito vector. His work with discovering vectors as modes of transmission was critical in the founding of tropical medicine and our current understanding of many tropical diseases. [3]

Training

Training in tropical medicine is quite different between countries. Most physicians are trained at institutes of tropical medicine or incorporated into the training of infectious diseases.

The London School of Hygiene and Tropical Medicine, founded by Sir Patrick Manson London School of Hygiene & Tropical Medicine - entrance.JPG
The London School of Hygiene and Tropical Medicine, founded by Sir Patrick Manson

In the UK, if a physician wants to specialize in tropical medicine, they must first train in general internal medicine and get accepted into the Royal College of Physicians. They must simultaneously study the specialty of infectious diseases while completing a full-time course load to receive their Diploma of Tropical Medicine and Hygiene. Their studies are carried out at either the London or Liverpool schools of tropical medicine. Additionally, they must spend two years at one of the UK centers approved for tropical medicine (located in London, Liverpool, or Birmingham). Physicians in the UK who wish to be certified in tropical medicine must spend at least a year abroad in an area lacking resources. Only then can they become certified in tropical medicine.

The training of United States tropical doctors is similar, though it is not a board recognized specialty in America. Physicians must first complete medical school and a program focusing on infectious diseases. Once completed, physicians can take the certification exam from the American Society of Tropical Medicine and Hygiene in order to receive the Certificate of Knowledge in Clinical Tropical Medicine and Travelers' Health. [4] [5]

Challenges

HIV

In developing countries alone, 22 million people are living with HIV. Most infections are still in Africa, but Europe, Asia, Latin America, and the Caribbean are now seeing large numbers of infections as well. [6] [7] 95% of expected new infections will occur in the low-income countries in the tropics. [8] [7] The expected number of new infections is 3-4 million per year. [7] Risk factors such as needle use and unprotected sex are much more prevalent in tropical and underdeveloped areas. Once HIV is transmitted to a tropical area it is spread throughout the sexually active population. Though how fast and how far it spreads varies, some African countries have an HIV prevalence of 10%. More alarming still, in urban areas, prevalence among pregnant women can get as high as 30%. Healthcare professionals themselves are at great risk of exposure to HIV. An HIV prevalence of 10% means any given workforce will also have a 10% prevalence, and this does not exclude the healthcare team. [7] [ dubious – discuss ] Tuberculosis is thought to cause a more rapid disease progression. Tuberculosis is prevalent in tropical and under-developed countries, only making HIV more devastating. [9] Without the expensive and high-tech medical equipment of developed, western countries, physicians in the tropics are left with few options. If they are able to catch an HIV-related bacterial or mycobacterial disease they can diagnose and manage the disease with basic drugs and standard treatment protocol. Many under-developed countries do not have a care strategy, and of those that do, they aren't as effective as they need to be to stop the spread of HIV. [7]

Malaria

A map detailing areas where malaria is endemic. Malaria map.PNG
A map detailing areas where malaria is endemic.

Malaria is a parasitic disease transmitted by an Anopheles mosquito to a human host. [10] The parasite that causes malaria belongs to the genus Plasmodium . Once infected, malaria can take a wide variety of forms and symptoms. The disease is placed into the uncomplicated category or the severe category. If quickly diagnosed and treated, malaria can be cured. However, some of the more serious symptoms, such as acute kidney failure, severe anemia, and acute respiratory distress syndrome can be fatal if not dealt with swiftly and properly. Certain types of Plasmodium can leave dormant parasites in the liver that can reawaken months or years later, causing additional relapses of the disease. [11] In the World Malaria Report of 2016, the World Health Organization reported a malaria infection rate of 212 million, 90% of which occurred in the African region. However, malaria infection rates had fallen 21% since 2010 at the time of the report. The WHO also reported an estimated mortality rate of 429,000 deaths in the year 2015. The malaria mortality rate had fallen 29% globally since 2010. [12] Children under 5 contract the malaria disease more easily than others, and in the year 2015, an estimated 303,000 children under the age of 5 were killed by malaria. Since the year 2010 however, the mortality rate of children under 5 fell by an estimated 35%. [12]

Tuberculosis

Tuberculosis (TB) is an infectious bacterial disease that can affect any part of the body, though it primarily affects the lungs. It is a disease that affects the poor and weak, and is far more common in developing countries. [13] [14] TB can either be in its latent or active form. TB can be latent for years, sometimes over a decade. [14] Though TB research receives a mere 1/6th the funding of HIV research, the disease has killed more people in the last 200 years than any other infectious disease. [13] According to the Liverpool School of Tropical Medicine, an estimated 9 million people were infected with TB in the year 2013 alone. That same year 1.5 million people died from TB. Of those 1.5 million, 360,000 were HIV positive. Tuberculosis is extremely expensive to treat, and treatments are now becoming ineffective due to drug-resistant TB strains. [13] In the year 2016, 1.3 million people died from TB. An additional 374,000 people died who were co-infected with both TB and HIV. [9] Research has shown that if the subject is infected with HIV, the risk of latent TB becoming active TB is between 12 and 20 times higher. [9]

Non-communicable diseases

Non-communicable diseases are a series of chronic illnesses such as cardiovascular disease, cancer, injuries, and respiratory diseases, among others. Historically these diseases have plagued developed countries far more than developing countries. [8] [15] In the Global Burden of Disease Study of 2001, it was discovered that 20% of deaths in sub-Saharan Africa were caused by non-communicable diseases. In 2005, the World Health Organization performed a study that showed 80% of chronic disease deaths occurred in low to middle income countries. [15] [8] Non-communicable disease prevalence has been rising in under-developed countries for a variety of reasons. Lack of education and preventive medicine in under-developed countries, along with malnutrition or poor diet lead to many risk factors for non-communicable diseases. [15]

Neglected tropical diseases

Neglected tropical diseases (NTDs) have been identified by the World Health Organization (WHO) as 18 tropical diseases, affecting over a billion people worldwide, especially in developing countries. These diseases are heterogeneous, meaning originating outside the organism affected by the disease. NTDs are caused by parasites, viruses, and bacteria. NTDs are neglected because they are not normally fatal on their own but are disabling. Persons with these diseases become more susceptible to other NTDs and fatal diseases such as HIV or malaria. [16]

Neglected tropical diseases effect can be measured in disability-adjusted life year (DALY). Each DALY corresponds to one lost year of healthy life, whether by death or disability. In the year 2010, it was estimated 26.6 million DALYs were lost. In addition to this, it is estimated NTDs cause a loss of 15–30% of productivity in countries that NTDs are endemic too. [16] According to the CDC, 100% of countries categorized as 'low income' were affected by 5 different NTDs at once. [17]

Interdisciplinary approach

Tropical medicine requires an interdisciplinary approach, as the infections and diseases tropical medicine faces are both broad and unique. Tropical medicine requires research and assistance from the fields of epidemiology, microbiology, virology, parasitology, and logistics. Physicians of tropical medicine must have effective communication skills, as many of the patients they interact with do not speak English comfortably. They must be proficient in their knowledge of clinical and diagnostic skills, as they are often without high-tech diagnostic tools when in the field. For example, in an attempt to manage the Chagas disease being brought into the almost Chagas-free Brazilian city São Paulo by Bolivian immigrants, an interdisciplinary team was set up. The Bolivian immigrant population in São Paulo had a prevalence of Chagas disease of 4.4%, while Chagas disease transmission in São Paulo has been under control since the 1970s. This influx of Chagas disease led to an interdisciplinary team being brought together, This team tested the feasibility of managing Chagas disease and transmission at the primary healthcare level. The interdisciplinary team consisted of community health agents and clerical healthcare workers to recruit Chagas infected persons for the study, physicians, nurses, lab workers, and community agents. A pediatrician and cardiologist were also on call. Each were trained in pathology, parasitology, ecoepidemiology, and how to prevent, diagnose, and control Chagas disease. Training from experts in these respective fields was required. They examined reasons for lack of adherence to treatment, and used this knowledge to improve the effectiveness of their interventions. This interdisciplinary approach has been used to train many teams across Brazil in the management of Chagas disease. [18]

Tropical medicine also consists of a preventive approach, especially in an educational aspect. For example, from 2009 to 2011, the London School of Hygiene & Tropical Medicine did an interventional study on a cohort of female sex workers (FSW) in Ouagadougou, Burkina Faso, a country in Western Africa. 321 HIV-unaffected FSWs were provided with peer-led HIV/STI education, HIV/STI testing and care, psychological support, general healthcare, and services for reproductive health. The same cohort would continue to follow up, quarterly, for 21 months. At each follow-up they were tested for HIV and were able to utilize the preventive interventions if need be. Using models based on the same study population had their been no interventions, the expected prevalence of HIV infections was 1.23 infection per 100 person years. In the actual cohort with access to interventions not a single HIV infection was observed in the collective 409 person-years of follow-up. [19]

Tropical research in the military

Throughout history, American military forces have been affected by many tropical diseases. In World War II alone, it was estimated almost one million soldiers had been infected by a tropical disease while serving. Most affected soldiers served in the Pacific, especially in the Philippines and New Guinea. Malaria was especially widespread in the Pacific, though soldiers in Southern Europe and Northern Africa also contracted tropical diseases. [2] Many diseases now known as neglected tropical diseases affected American soldiers as well. These included helminthiasis, schistosomiasis, dengue, and lymphatic filariasis. Lymphatic filariasis was such a problem it caused a $100 million evacuation of U.S. troops out of New Guinea and the Tonga Islands. [2]

In both the Korean and Vietnam Wars the United States army continued to be affected by tropical diseases. The most prevalent diseases to affect their military were malaria and dengue. Hepatitis A, scrub typhus, and hookworm infections were among the other tropical infections picked up by troops in these conflicts. [2]

To combat the significant effects tropical diseases were having on their forces, the United States Military worked hard to develop drugs, vaccines, and other methods of disease control. Research done at the Walter Reed Army Institute of Research (WRAIR), the Naval Medical Research Center (NMRC), and various affiliated research centers have greatly improved the military's preparedness against tropical disease. In 1967, Captain Robert Phillips earned the Lasker Award for developing a type of IV therapy that reduced cholera's fatality rate from 60% to less than 1%. Other interventions licensed by the US Army include vaccines for hepatitis A and Japanese encephalitis. They have also developed the drugs mefloquine and malarone, both used in the treatment of malaria. [2]

Looking forward, the United States military currently has clinical trials testing for vaccines of malaria, adenovirus infection, dengue, and HIV/AIDS underway. [2] However, with massive budget cuts to their military, these research centers are getting less and less funding and have lost many contractors already. [2]

Bibliography

Organizations

See also

Related Research Articles

<span class="mw-page-title-main">Tuberculosis</span> Infectious disease

Tuberculosis (TB), also known colloquially as the "white death", or historically as consumption, is an infectious disease usually caused by Mycobacterium tuberculosis (MTB) bacteria. Tuberculosis generally affects the lungs, but it can also affect other parts of the body. Most infections show no symptoms, in which case it is known as latent tuberculosis. Around 10% of latent infections progress to active disease which, if left untreated, kill about half of those affected. Typical symptoms of active TB are chronic cough with blood-containing mucus, fever, night sweats, and weight loss. Infection of other organs can cause a wide range of symptoms.

<span class="mw-page-title-main">Mantoux test</span> Immunological method to test for tuberculosis

The Mantoux test or Mendel–Mantoux test is a tool for screening for tuberculosis (TB) and for tuberculosis diagnosis. It is one of the major tuberculin skin tests used around the world, largely replacing multiple-puncture tests such as the tine test. The Heaf test, a form of tine test, was used until 2005 in the UK, when it was replaced by the Mantoux test. The Mantoux test is endorsed by the American Thoracic Society and Centers for Disease Control and Prevention. It was also used in the USSR and is now prevalent in most of the post-Soviet states, although Soviet mantoux produced many false positives due to children's allergic reaction.

<span class="mw-page-title-main">Trichuriasis</span> Infection by Trichuris trichiura (whipworm)

Trichuriasis, also known as whipworm infection, is an infection by the parasitic worm Trichuris trichiura (whipworm). If infection is only with a few worms, there are often no symptoms. In those who are infected with many worms, there may be abdominal pain, fatigue and diarrhea. The diarrhea sometimes contains blood. Infections in children may cause poor intellectual and physical development. Low red blood cell levels may occur due to loss of blood.

Tropical diseases are diseases that are prevalent in or unique to tropical and subtropical regions. The diseases are less prevalent in temperate climates, due in part to the occurrence of a cold season, which controls the insect population by forcing hibernation. However, many were present in northern Europe and northern America in the 17th and 18th centuries before modern understanding of disease causation. The initial impetus for tropical medicine was to protect the health of colonial settlers, notably in India under the British Raj. Insects such as mosquitoes and flies are by far the most common disease carrier, or vector. These insects may carry a parasite, bacterium or virus that is infectious to humans and animals. Most often disease is transmitted by an insect bite, which causes transmission of the infectious agent through subcutaneous blood exchange. Vaccines are not available for most of the diseases listed here, and many do not have cures.

<span class="mw-page-title-main">Helminthiasis</span> Any macroparasitic disease caused by helminths

Helminthiasis, also known as worm infection, is any macroparasitic disease of humans and other animals in which a part of the body is infected with parasitic worms, known as helminths. There are numerous species of these parasites, which are broadly classified into tapeworms, flukes, and roundworms. They often live in the gastrointestinal tract of their hosts, but they may also burrow into other organs, where they induce physiological damage.

<span class="mw-page-title-main">Hookworm infection</span> Disease caused by intestinal parasites

Hookworm infection is an infection by a type of intestinal parasite known as a hookworm. Initially, itching and a rash may occur at the site of infection. Those only affected by a few worms may show no symptoms. Those infected by many worms may experience abdominal pain, diarrhea, weight loss, and tiredness. The mental and physical development of children may be affected. Anemia may result.

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<span class="mw-page-title-main">Drugs for Neglected Diseases Initiative</span> Non-profit organization

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<span class="mw-page-title-main">Neglected tropical diseases</span> Diverse group of tropical infectious diseases which are common in developing countries

Neglected tropical diseases (NTDs) are a diverse group of tropical infections that are common in low-income populations in developing regions of Africa, Asia, and the Americas. They are caused by a variety of pathogens, such as viruses, bacteria, protozoa, and parasitic worms (helminths). These diseases are contrasted with the "big three" infectious diseases, which generally receive greater treatment and research funding. In sub-Saharan Africa, the effect of neglected tropical diseases as a group is comparable to that of malaria and tuberculosis. NTD co-infection can also make HIV/AIDS and tuberculosis more deadly.

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References

  1. 1 2 "Tropical medicine". Health Careers. April 7, 2015.
  2. 1 2 3 4 5 6 7 Beaumier CM, Gomez-Rubio AM, Hotez PJ, Weina PJ (December 26, 2013). "United States military tropical medicine: extraordinary legacy, uncertain future". PLOS Neglected Tropical Diseases. 7 (12): e2448. doi: 10.1371/journal.pntd.0002448 . PMC   3873258 . PMID   24386494.
  3. 1 2 To KK, Yuen KY (October 2012). "In memory of Patrick Manson, founding father of tropical medicine and the discovery of vector-borne infections". Emerging Microbes & Infections. 1 (10): e31. doi:10.1038/emi.2012.32. PMC   3630944 . PMID   26038403.
  4. ↑ "Tropical Medicine MD/MPH Program Requirements | School of Public Health and Tropical Medicine". sph.tulane.edu. August 3, 2017. Retrieved February 25, 2018.
  5. ↑ "Mayo International Health Program – Tropical Medicine Courses". Mayo Clinic. Retrieved February 25, 2018.
  6. ↑ "WHO | HIV / AIDS". www.who.int. Archived from the original on March 24, 2006. Retrieved March 19, 2018.
  7. 1 2 3 4 5 Gilks CF (June 1, 1997). "Tropical medicine in the HIV/AIDS era". The Lancet. 349: S17–S18. doi:10.1016/S0140-6736(97)90076-3. S2CID   54366285.
  8. 1 2 3 Boutayeb A (March 2006). "The double burden of communicable and non-communicable diseases in developing countries". Transactions of the Royal Society of Tropical Medicine and Hygiene. 100 (3): 191–9. doi:10.1016/j.trstmh.2005.07.021. PMID   16274715.
  9. 1 2 3 "TB and HIV | Co-infection, statistics, diagnosis & treatment". TB Facts.org. Retrieved March 19, 2018.
  10. ↑ Prevention, CDC – Centers for Disease Control and. "CDC – Malaria – About Malaria – Biology". www.cdc.gov. Retrieved March 12, 2018.
  11. ↑ Prevention, CDC – Centers for Disease Control and. "CDC – Malaria – About Malaria – Disease". www.cdc.gov. Retrieved March 12, 2018.
  12. 1 2 "Fact Sheet: World Malaria Report 2016". World Health Organization. Archived from the original on December 15, 2016. Retrieved March 12, 2018.
  13. 1 2 3 "Tuberculosis | LSTM". www.lstmed.ac.uk. Retrieved March 1, 2018.
  14. 1 2 "Basic TB Facts | TB | CDC". www.cdc.gov. February 20, 2018. Retrieved March 19, 2018.
  15. 1 2 3 Miranda JJ, Kinra S, Casas JP, Davey Smith G, Ebrahim S (October 2008). "Non-communicable diseases in low- and middle-income countries: context, determinants and health policy". Tropical Medicine & International Health. 13 (10): 1225–34. doi:10.1111/j.1365-3156.2008.02116.x. PMC   2687091 . PMID   18937743.
  16. 1 2 "Neglected Tropical Diseases: Progress and Challenges for the Post-2015 Development Era – Science in the News". Science in the News. December 31, 2014. Retrieved February 26, 2018.
  17. ↑ "CDC – Global Health – Neglected Tropical Diseases". www.cdc.gov. Retrieved February 27, 2018.
  18. ↑ Shikanai Yasuda MA, Sátolo CG, Carvalho NB, Atala MM, Ferrufino RQ, Leite RM, Furucho CR, Luna E, Silva RA, Hage M, Oliveira CM, Busser FD, Freitas VL, Wanderley DM, Martinelli L, Almeida SR, Viñas PA, Carneiro N (March 2017). "Interdisciplinary approach at the primary healthcare level for Bolivian immigrants with Chagas disease in the city of São Paulo". PLOS Neglected Tropical Diseases. 11 (3): e0005466. doi: 10.1371/journal.pntd.0005466 . PMC   5380346 . PMID   28333923.
  19. ↑ "Recent Findings in HIV/AIDS Described by Researchers from London School of Hygiene and Tropical Medicine (HIV prevention and care services for female sex workers: efficacy of a targeted community-based intervention in Burkina Faso)." AIDS Weekly, October 19, 2015, p. 66. General OneFile, http://link.galegroup.com/apps/doc/A431893004/ITOF?u=mlin_b_northest&sid=ITOF&xid=6128df21. Accessed March 22, 2018.
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