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Biological Hazards

In: Science

Submitted By reguinto
Words 830
Pages 4
>pathogens (bacterium, virus, parasites) invades the body and multiplirs in its cells and tissues
>ex. flu, malaria, tb, measles

>single-celled organisms that multiply rapidly on their own
>most are harmless and beneficial
>some are infectious
~bacterial disease - results from infection as bacteria multiply and spread throughout the body

>smaller bacteria working by invading a cell and taking over genetic machinery to copy themselves
~viral disease ex. flu, AIDS

TRANSMISSIBLE DISEASE (contagious/communicable disease)
>can be transmitted
~bacterial disease (tb, gonorrhea, strep throat)
~viral disease (cold, flu, AIDS)

>caused by something
>does not spread
>develops slowly and have multiple causes ex. cardiovascular disease, cancers, asthma, diabetes, malnutrition

**since 1950, incidence of infectious diseases and death rates from them reduced:
>better health care
>dev't of vaccines

Infectious Diseases are still Major Health Threats
>in less-developed countries
>diseases can be spread through air, water, food and body fluids
•disease carrying bacteria has developed genetic immunity to antibiotics •disease transmitting insects (mosquitoes) became immune to pesticides (DDT)

*epidemic - large scale outbreak of an infectious disease in an area or country
*pandemic - global epidemic like TB or AIDS

Case Study
The Growing Global Threat from Tuberculosis
>contagious bacterial infection in the lungs

Factors for the Spread of TB
>few TB screening and control programs in less developed countries
>TB bacterium have developed resistance to antibiotics
>person-to-person contacts

*AIDS weaken immune system
*people with AIDS are more likely to develop active TB

In slowing the spread of TB:
>early identification and...

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