BMS2052 Study Guide - Final Guide: Bubonic Plague, Non-Communicable Disease, Tute

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BMS2052
LAB & TUTE EXAM NOTES
TUTE NOTES key points
Tute 1: Epidemiology and the spread of infection
Notes
Beginnings of epidemiology: John Snow investigating cholera
o Later the bacterium Vibrio cholera was found to be the causative agent by Robert Koch
Epidemiology is the study of the occurrence, distribution and control of disease in a population
Endemic: the disease is occurring at a constant low-level frequency for a population
If the disease becomes an epidemic: there is an unexpected increase above the constant
frequency in a given population (i.e above endemic levels)
Note that the team outbreak is sometimes synonymous with epidemic, however sometimes it
may be used to describe an unexpected increase in frequency within a small part of the
population
If this sudden increase in disease frequency occurs on a global or worldwide scale it is now a
pandemic
In any case it is important to trace the primary source of disease, so that measures can be put
into place to contain any further spread
Note that endemic, epidemic and pandemic are for both infectious and non-communicable
disease
Infectious disease: is any change from a state of health in which part or all of the host’s boy
cannot carry on its normal functions because of the presence of an infectious agent or its
products
Or: an illness due to a specific infectious agent or its toxic product that arises through
transmission of that agent or its products from an infected person, animal or reservoir to a
susceptive host, either directly or indirectly through an intermediate plant or animal host, vector
or the inanimate environment.
A new emerging disease: sever acute respiratory syndrome (SARS) and middle east respiratory
syndrome (MERS)
Re-emerging: Ebola and Bubonic Plague
Basic factors that influence transmission of infectious diseases
What is severity (visibility), lethality and infectivity?
o Severity is the extent of physiological effects suffered by the host
Learning outcomes
1. Gain an understanding of epidemiology, epidemic/outbreak, endemic and pandemic as related to
infectious disease
2. Identify and explain the broad factors which determine infectious disease causation and
transmission
3. Discuss how epidemiology is used to understand and prevent the spread of infectious disease
1.
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BMS2052
LAB & TUTE EXAM NOTES
o Lethality how lethal
o Infectivity the most infectious, the quicker the spread
List modes of transmission, symptoms, abilities (resistance)
Number of people affected, and number of people dead
Patient zero why and how is this significant during an outbreak
o Patient zero: the index case or initial patient in the population of an epidemiological
investigation
o The first case of a condition
o Important to find because knowing that persons history can help researchers determine
how and when the outbreak started
o Can give a clue to what the source was
Notes from pandemic II
Virus
o Fastest evolution
o Most affected by environment
o Bonus to infectivity
Bacteria
o Medium evolution
o Normally affected by environment
o Bonus to drug resistance
Parasite
o Slowest evolution
o Least affected by environment i.e is much more resistant to environmental conditions
o Low visibility
Disease resistances
Cold resistance: allows your disease to function properly in regions that have a cold
environment
Heat resistance
Moisture resistance
Drug resistance: increases the change of your disease killing infected individuals. It also makes it
more difficult for vaccines to be engineered
Disease transmissions
Rodent
Insect
Airborne
Waterborne
Disease traits
Virus: adds a bonus to infectivity, makes disease more vulnerable to environment conditions
and increases disease evolution
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BMS2052
LAB & TUTE EXAM NOTES
Bacteria: adds a bonus to drug resistance
parasite makes the disease less visible and more resistance to environmental conditions
catching: gives your disease rodent, insect, airborne or waterborne transmissions
durable: increases your diseases natural resistance to cold, heat, moisture or drugs
bloody vomit, bloodletter, decomposer: increases your diseases lethality and infectivity
ablaze: greatly increases your diseases lethality
isolated: reduced your diseases infectivity
expected: vaccines are quicker to engineer than normal
apocalyptic: increase your diseases visibility
mutator: vaccines are more difficult to engineer than normal
Epidemiology triangle major tool for infectious disease
Vectors: agent, host, environment
o These are factors that contribute to and influence disease
Tute 2: Medical microbiology
Notes
An overview of diagnosis clinical microbiology and diagnosis of infectious disease
Diagnosis takes place within a clinical microbiology lab
o The identity of causative microorganism
o Its antimicrobial susceptibility
Clinical specimens
Learning outcomes
1. Gain an understanding of lab diagnosis techniques for the identification of microorgnisms causing
an infectious disease
2. Broadly explain important considerations related to lab diagnosis
3. Describe the techniques for identification of rubella, syphilis, clostriudium perfringens mediated
disease and diphtheria, and discuss the advantages and disadvantages of these techqnies
4. Locate and identify alternative techniques for diagnosis of rubella, syphilis, clostridium
perfringens- mediated disease and diphtheria
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