Summary: Containment Strategies Of Infectious Diseases In Global Context
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1.3.1 Chapter 1
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What is the precise definition of a communicable disease according to Webber?
An illness that is transmitted from a person, animal, or inanimate source to another person either directly, with the assistance of an intermediate host, or by a vector. It covers infectious diseases, parasitic infections, vector-borne infections, zoonoses, and all transmissible conditions. -
Define and contrast an epidemic versus an endemic disease.
- Epidemic: The introduction of a new infection OR the presence of an illness substantially in excess of normal expectancy in a community (can be seasonal like influenza, or occur when susceptible numbers reach a critical threshold like measles).
- Endemic: Constantly present in a specific geographical area or population group at an expected baseline level (e.g., malaria in tropical countries among the adult population).
- Epidemic: The introduction of a new infection OR the presence of an illness substantially in excess of normal expectancy in a community (can be seasonal like influenza, or occur when susceptible numbers reach a critical threshold like measles).
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Which environmental and socio-economic conditions most strongly encourage communicable disease transmission?
- Overcrowding and poor hygiene, which are invariably tied to poverty.
- Tropical environments, which provide ideal conditions of temperature and humidity for vector proliferation and parasite developmental cycles.
- Note: Western countries historically faced the same devastation (e.g., plague, measles) until sanitation, housing, and education improved prior to antibiotics.
- Overcrowding and poor hygiene, which are invariably tied to poverty.
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Why is the boundary between communicable and non-communicable diseases becoming blurred (specifically regarding cancer and psychiatric illness)?
- Hepatitis B virus (HBV) & Hepatitis C (HCV): Cause cirrhosis and hepatocellular carcinoma (liver cancer).
- Human Papillomavirus (HPV): Primary causative agent of cervical cancer (preventable via HPV vaccination).
- Hepatitis B virus (HBV) & Hepatitis C (HCV): Cause cirrhosis and hepatocellular carcinoma (liver cancer).
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How does Webber explain the lower prevalence of allergic and autoimmune disorders in developing countries compared to developed countries?
- In developed nations, excessive cleanliness, antibacterial products, and early antibiotic use in the first 3 years of life prevent minor childhood infections that stimulate and balance the immune system.
- This lack of early immune stimulation leads to increases in allergies, type 1 diabetes, inflammatory bowel disorders, and multiple sclerosis. Certain gut parasites (Ascaris, Trichuris, hookworms) even secrete immunosuppressive molecules that reduce host allergic reactions
- In developed nations, excessive cleanliness, antibacterial products, and early antibiotic use in the first 3 years of life prevent minor childhood infections that stimulate and balance the immune system.
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What can an agent be, and what must an organism accomplish to cause disease?
- Biological organism: Virus, prion, bacterium, rickettsia, protozoan, helminth, fungus, or arthropod. Organisms must multiply, find a route of transmission, and survive.
- Physical or chemical agent: Exogenous or endogenous toxins and poisons (adulterated cooking oil).
- Biological organism: Virus, prion, bacterium, rickettsia, protozoan, helminth, fungus, or arthropod. Organisms must multiply, find a route of transmission, and survive.
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What is an infectious reservoir, and what types exist?
- Definition: A host, vector, or inanimate medium where an infectious agent lives, multiplies, and adapts with minimal host reaction, serving as a source from which other susceptible hosts can be colonized.
- Types: Humans (cases or carriers), vertebrate animals (zoonotic reservoirs), vectors (e.g., ticks passing pathogens transovarially), and the inanimate environment (soil, water).
- Definition: A host, vector, or inanimate medium where an infectious agent lives, multiplies, and adapts with minimal host reaction, serving as a source from which other susceptible hosts can be colonized.
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What is the difference between persistence and latency in environmental survival?
- ersistence: Developing resistant morphological structures that withstand harsh environmental conditions (e.g., protozoan cysts like Entamoeba histolytica, nematode eggs like Ascaris, bacterial spores like tetanus/anthrax). Requires intense heat or chemical disinfectants to eliminate.
- Latency: A temporary environmental developmental stage that is non-infective to the new host, allowing the parasite to wait until favourable environmental conditions emerge before maturing into the infective form (e.g., hookworms, Strongyloides).
- ersistence: Developing resistant morphological structures that withstand harsh environmental conditions (e.g., protozoan cysts like Entamoeba histolytica, nematode eggs like Ascaris, bacterial spores like tetanus/anthrax). Requires intense heat or chemical disinfectants to eliminate.
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Define toxicity, virulence, and the dose-response relationship of an infectious agent.
- Toxicity: Pathological reaction induced by foreign proteins or metabolic byproducts/toxins (e.g., extreme toxicity of tetanus toxin versus mild local reactions).
- Virulence: The degree of pathogenicity / disease severity produced in the host (can attenuate over serial human passage, a principle used to make live vaccines)
- Dose-Response: In some pathogens, illness severity correlates directly with the initial number of organisms ingested/introduced (common in bacterial food poisoning). In others, surpassing the threshold produces identical disease regardless of dose.
- Toxicity: Pathological reaction induced by foreign proteins or metabolic byproducts/toxins (e.g., extreme toxicity of tetanus toxin versus mild local reactions).
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How does the infective dose dictate whether public health prioritizes water quantity (hygiene) or water quality (sanitation)?
- Low infective dose (e.g., enteric viruses) Requires very few organisms to establish infection. Easily spreads by direct person-to-person contact. Water quality and latrines have limited impact; water quantity for handwashing and personal hygiene is paramount.
- High infective dose (e.g., Vibrio cholerae, Salmonella typhi, ~10⁶ organisms): Requires environmental multiplication or heavily contaminated vehicles. Improving drinking water quality and sewage treatment directly cuts transmission chains.
- Low infective dose (e.g., enteric viruses) Requires very few organisms to establish infection. Easily spreads by direct person-to-person contact. Water quality and latrines have limited impact; water quantity for handwashing and personal hygiene is paramount.
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