Zoonotic Diseases Books Pdf

[Esam Rosado]

H1N1swine flu"), SARS, mad cow disease, and HIV/AIDS are a few examples of zoonotic diseases-diseases transmitted between humans and animals. Zoonotic diseases are a growing concern given multiple factors: their often novel and unpredictable nature, their ability to emerge anywhere and spread rapidly around the globe, and their major economic toll on several disparate industries.

Infectious disease surveillance systems are used to detect this threat to human and animal health. By systematically collecting data on the occurrence of infectious diseases in humans and animals, investigators can track the spread of disease and provide an early warning to human and animal health officials, nationally and internationally, for follow-up and response. Unfortunately, and for many reasons, current disease surveillance has been ineffective or untimely in alerting officials to emerging zoonotic diseases.

Sustaining Global Surveillance and Response to Emerging Zoonotic Diseases assesses some of the disease surveillance systems around the world, and recommends ways to improve early detection and response. The book presents solutions for improved coordination between human and animal health sectors, and among governments and international organizations.

Parties seeking to improve the detection and response to zoonotic diseases--including U.S. government and international health policy makers, researchers, epidemiologists, human health clinicians, and veterinarians--can use this book to help curtail the threat zoonotic diseases pose to economies, societies, and health.

NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance.

This study was supported by the U.S. Agency for International Development Award No. GHN-G-00-07-00001-00. Any opinions, findings, conclusions, or recommendations in this document are those of the authors and do not necessarily reflect the views of the organizations or agencies that provided support for the project. Mention of trade names, commercial products, or organizations does not constitute their endorsement by the sponsoring agency.

This textbook was developed to help human and veterinary healthcare professionals and students enhance their knowledge of zoonotic diseases, especially those associated with companion animal species. Partnerships between human, veterinary and public health professionals are needed to raise awareness, enhance detection, and promote prevention for zoonotic diseases to protect the health of humans and pets. The textbook also provides educational materials to educate clients, patients and staff on the risks and prevention of zoonotic diseases.

Wildlife and the zoonotic pathogens they reservoir are the source of most emerging infectious diseases of humans. AIDS, hantavirus pulmonary syndrome, SARS, Monkeypox and the human ehrlichioses are a few examples of the devastating effect achieved by cross-species transmission of viral and bacterial pathogens of wildlife. Many factors contribute to the appearance and spread of a pathogen, including; changes in host/pathogen evolution and interaction, human demographics, behavior and technology, environmental factors, and the availability of health care and a public health infrastructure capable of providing surveillance and interventions aimed at disease prevention and control. Additionally, historical factors and the coalescence of particular circumstances modify the conditions by which pathogens and species have an opportunity to intermix, evolve and spread.

This volume provides an overview of zoonotic pathogen emergence with an emphasis on the role of wildlife. The firstsections of the book explore the mechanisms by which evolution, biology, pathology, ecology, history, and current context have driven the emergence of different zoonotic agents, the next sections provide specific example of disease emergence linked to wildlife, and the final section offers an overview of current methods directed at the surveillance, prevention and control of zoonotic pathogens at the level of the wildlife host and possible mechanisms to improve these activities. This book will be useful to microbiologists, ecologists, zoologists, entomologists as well as physicians and epidemiologists.

Malaria in humans is caused by protozoan parasites of the genus Plasmodium, including Plasmodium falciparum, P. malariae, P. ovale, and P. vivax. In addition, zoonotic forms have been documented as causes of human infections and some deaths, especially P. knowlesi, a parasite of Old World (Eastern Hemisphere) monkeys, in Southeast Asia.

Plasmodium species are transmitted by the bite of an infective female Anopheles mosquito. Occasionally, transmission occurs by blood transfusion, needle sharing, nosocomially, organ transplantation, or vertically from mother to fetus. Malaria transmission occurs in large areas of Africa, Latin America, and parts of the Caribbean, Eastern Europe, the South Pacific, and in Asia including South Asia, Southeast Asia, and the Middle East (Map 5-12, Map 5-13, and Map 5-14).

Malaria-endemic destinations are labeled using black font; destinations not endemic for malaria are labeled using gray font. Countries with areas endemic for malaria are shaded completely even if transmission occurs only in a small part of the country. For more specific within-country malaria transmission information, see Section 2, Yellow Fever Vaccine & Malaria Prevention Information, by Country.

Information about malaria transmission in specific countries is derived from various sources, including WHO (see Sec. 2, Ch. 5, Yellow Fever Vaccine & Malaria Prevention Information, by Country). The information presented here was accurate at the time of publication; the risk for malaria can change rapidly and from year to year, however, because of changes in local weather conditions, mosquito vector density, and prevalence of infection. See updated information CDC website.

Malaria is characterized by fever and influenza- like symptoms, including chills, headache, myalgias, and malaise; symptoms can occur intermittently. In severe disease, acute kidney injury, acute respiratory distress syndrome, mental confusion, seizures, coma, and death can occur. Malaria symptoms can develop as early as 7 days after being bitten by an infectious mosquito in a malaria-endemic area and as late as several months or more after exposure. Suspected or confirmed malaria, especially P. falciparum, is a medical emergency requiring urgent intervention, because clinical deterioration can occur rapidly and unpredictably. See Box 5-10 for frequently asked clinical questions.

Travelers with symptoms of malaria should seek medical evaluation as soon as possible, even if still traveling. Consider malaria in any patient with a febrile illness who has recently returned from a malaria-endemic country. Diagnostic assistance is available from state public health laboratories or CDC. The CDC malaria laboratory can assist in speciating malaria by blood smear microscopy, or confirm species by PCR testing. The CDC laboratory also can assess malaria parasites for mutations that confer resistance to medications. Serologic testing, used in certain situations (e.g., case investigations), can also be done by CDC laboratories.

In the United States, malaria is a notifiable disease. Health care providers must report cases of malaria diagnosed via microscopy or PCR in the United States and its territories to local or state health departments. See more information on reporting malaria.

In resource-limited settings, and particularly in sub-Saharan Africa, overdiagnosis and the rate of false-positive microscopy for malaria can be high; warn travelers that a local diagnosis of malaria could be incorrect. In such cases, acutely ill travelers should seek the best available medical services and continue their prophylaxis regimen until they have a definitive diagnosis.

Both positive and negative RDT results must always be confirmed by microscopy. Microscopy confirmation of the RDT result should occur as soon as possible, because the information on the presence, density, and parasite species is critical for optimal management of malaria. The US Food and Drug Administration (FDA) has approved an RDT (the BinaxNOW Malaria test) for hospital and commercial laboratory use; the test is not approved for use by clinicians or patients. Laboratories that do not provide in-house, on-the-spot microscopy services should maintain a stock of malaria RDTs so that they will be able to perform immediate malaria diagnostic testing when needed.

PCR tests also are available to detect malaria parasites. These tests are more sensitive than routine microscopy, but results are not usually available as quickly as microscopy results, thus limiting the utility of PCR for acute diagnosis and initial clinical management. Use of PCR testing is encouraged to confirm the species of malaria parasite and detect mixed infections.

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