Health Flashcards
(53 cards)
Define epidemic
A widespread occurrence of an infectious disease in an area at a particular time
Define Pandemic
A global epidemic of an infectious disease that spreads through a large proportion on the human population
Define Endemic
Constantly present low levels of an infectious disease in an area
Define Contagious
A disease that is transmitted from one to another through contact
Define Infectious
Disease caused by germs that are readily spread from one person to another
Define Viral
An agent of infection- micro-organisms smaller than bacteria that invade cells
Define Bacterial
An agent of infection, a micro-organism that are free-living
Define Parasitic
Organisms living in another organism
Define Mortality Rate
The ratio of deaths in an area to the population expressed per thousand per year
Define Infant Mortality rate
Number of deaths of children under 1year per thousand live births per year
Define Life expectancy
Number of years an individual can expect to live
Define the attack rate
Number of cases of a disease diagnosed in an area divided by the total population during the epidemic
Modes of transmission and examples
- By Air -TB
- By Physical Contact- HIV
- By living organisms- Malaria
- By endemic change- Ringworm
- By food/water contamination- Cholera
- By blood- Hepatitis
Patterns of Diffusion
- Expansion Diffusion- the infection spreads out in all directions from point of origin
- Contagious Diffusion- the infection spreads out by direct contact
- Hierarchical Diffusion- The infection spreads out through a particular system
- Relocation Diffusion- An infection spreads into a new area and dies out in its previous location
Describe the work of John Snow and how this has changed to way we map diseases
Dr John Snow’s working of mapping the Soho cholera outbreak makes him considered to be the father of epidemiology
- His mapping and analysis techniques are used to determine the patterns and distribution of diseases from local to global scales. He showed that health and disease are not randomly distributed in a population, there are patterns to a diseases occurence and diffusion
What is HIV
It is a slow retrovirus, meaning it can take years to show symptoms after infections. It is transmitted through direct contact and is carried within the bloodstream and destroys white blood cells
Where is HIV thought to have originated from
In Sub-Saharan Africa, crossing over from the Chimpanzee population in contaminated bush meat or an animal bite
3 ways that HIV can be spread
- Blood-to-Blood Contact
- Exchange of Bodily Fluids
- Mother to Child Transmission
Factors effecting the spread of HIV
- International Travel
- Urbanisation- very mobile population and migration for work
- Intravenous drug use
- Reluctnace of people to get tested due to stigma attached
Management and Control of HIV
- Currently considered incurably with no vaccine existing
- Antiretroviral treatment prolongs peoples lives, however they are expensive and no widely available
- Education
What is SARS
Severe Acute Respitary Syndrome- causing breathing difficulties leading to pneumonia
Where is SARS thought to have originated from
In bats and spread to huamns either directly or through animals held in Chinese markets
How is SARS transmitted
Through respiratory droplets and direct contact
How is Ebola Spread
- Primarily through direct contact with the blood of bodily fluids of an infected person
- Contact with contaminated items
- Sexual Contact
- Breast feeding