PBH ch. 7

def: virus transmitted person to person vs. are in healthy but can cause disase when relocated

note: some exposed, and they don't get it

Isolated bacteria that causes TB

• Must be there in unhealthy 
• Isolate and grown in pure 
• Reintroduce and cause disease in healthy
• Re isolate and note it be the original cause

• D:
• droplet spread
• I:
• airborne- dust
• vehicleborn-food/fomites aka handkerchief
• vectorborne-flies in shit or lifecycle 

• ability agent to cause infection to host
• HOW MANY? 
• (only one can affect A LOT)

ability agent to induce disease

50% vs 90% severity of the disease after infection 

note: young vs old like influenza

• barrier
• immunizations
• screening
• treatments 
• max effectiveness

air tight suit and laminar flow hood

• 1-not common in humans/e coli
• 2-b/c of injury or ingestion/HIV
• 3- b/c of air and it's exotic-SARS or TB
• 4- b/c of air but superkiller-Lassa

• max vaccine
• resistance of a group to invasion 

owned by tom slick

no

• limited to only humans
• limited persistence
• absence of long term carrier
• immunity
• vaccination 
• herd immunity
• easily diagnosed
• effectiveness of vaccines

inherent danger of exposure