Flashcards in 12.3 : Transmision of Communicable Diseases Deck (9):
Give examples of direct transmission
Direct contact e.g. kissing, skin-to-skin contact, sexual intercourse
Inoculation e.g break in skin, animal bites, puncture wound / sharing needles
Ingestion e.g. contaminated food and drink, transferring pathogens to mouth from hands
What is direct transmission ? What diseases spread like this?
Pathogen is transmitted directly from one organism to the other.
HIV - sex
Athletes foot - touch
What is indirect transmission? What diseases spread like this?
Pathogen travels from one individual to another indirectly ( using an intermediate )
Late blight is spread when spores are carried between plants ( air and then water )
Malaria is press via mosquitoes which act as vectors
Give examples of indirect transmission
Fomites e.g. inanimate objects like bedding or cosmetics can transfer pathogens
Droplet infection ( inhalation) e.g. saliva and mucus expelled when coughing or sneezing. Healthy people breathe this.
Vectors - transmits pathogens from one host to another. Animals can be vectors, but so can water
What factors affect transmission of communicable diseases in animals?
Overcrowded living and working conditions
Compromised immune system
Culture and infrastructure
What factors affect transmission of communicable diseases in plants?
Planting varieties of plants that are susceptible to disease
Over - crowding
Poor mineral nutrition
Damp warm conditions
How does overcrowding increase transmission of communicable diseases?
- can remain in air for long time and infect new people
- spread by droplet infection
- increases chance of contact
How does climate change increase transmission of communicable diseases?
e.g. late blight
- wet summers : spores need water to spread
- hot and humid : ideal conditions for mosquitoes to breed