TB Presentation4
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Mycobacterium Tuberculosis
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Decline
During 2000, a total of 16,377 cases oftuberculosis (TB) (5.8 cases per100,000 of population) were reported toCDC from the 50 states and the Districtof Columbia, representing a 7%decrease from 1999 and a 39%
decrease from 1990. In 1992 there wasa resurgence of TB in the United States.
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Reported Cases
Ethnicity
Source: CDC
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Rate per Population
Source: CDC
http://www.cdc.gov/mmwr/preview/mmwrhtml/mm5105a3.htmhttp://www.cdc.gov/mmwr/preview/mmwrhtml/mm5105a3.htmhttp://www.cdc.gov/mmwr/preview/mmwrhtml/mm5105a3.htm -
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Mycobacterium Tuberculosis
(TB) A slow growing bacteria that primarily
affects the respiratory tract of humans.
Other areas that can be affected:
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TB Growth
What happens after the bacteria haveentered the body?
They begin to grow in the alveoli (small airsacs) of the lungs and then spreadthroughout the lung and body.
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LungAnatomy
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Source: CDC
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Incubation
What is the usual incubation period?2-10 weeks for TB infection
Up to 2 years for TB disease (highest risk) TB infected, Latent TB:Positive Skin Test-not contagious
TB disease/active:Showing symptoms and is highlycontagious
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Treatment
Multidrug resistant
They are trying many new different drug
combinations to combat the drug-resistantstrains.
DOT
Directly Observed Therapy
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Directly Observed Therapy
DOT
Directly Observed Therapy
Source: CDC
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Testing
Two major screenings available to thegeneral population:
Tine Test (3 prong)PPD (Purified Protein Derivative)
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PPD Testing
Source: CDC
http://www.cdc.gov/mmwr/preview/mmwrhtml/mm5105a3.htmhttp://www.cdc.gov/mmwr/preview/mmwrhtml/mm5105a3.htm -
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Transmission
Inhalation of infectious particles:
Infectious particles are carried in the air
after an active TB individual speaks,coughs, sneezes, or certain medicalprocedures are performed.
These particles are called dropletnuclei.
1-5 microns/ 1/5000 of an inch in size
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Infected Person
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Infected Person Cough-Sneeze-Talking
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Infected Person
Transmitting Droplets
Cough-Sneeze-Talking
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Which lung is normal?
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Respirator
A respirator is a personal protectivedevice that removes air contaminants
such as dust, mists, and aerosols fromthe ambient air.
The ones used to protect against TB,
filter out material down to 0.3 microns at95% efficiency (N95).
NIOSH approved
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Respirator
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Respirator
N 95 NIOSHApproved
Must befit tested
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AFB Isolation
Acid Fast Bacilli (AFB) isolation room:
Warning signs
Must be maintained under negativepressure.
Exhaust air from the isolation room awayfrom air intakes for the building, usually onthe roof.
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Filters
High Efficiency Particulate Air filter(HEPA):
Used to filter air for recirculation in an AFBisolation room at 0.3 microns at 99.97%efficiency.
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Settings at Risk
High Risk Settings:
Health care settings
Correctional institutionsHomeless shelters
Long-term care facilities for the elderly
Drug treatment centers
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Where are your risks?
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