pathogens and disease Flashcards
(25 cards)
what is a disease
a condition that impairs the normal functioning of an organism
what is a pathogen
an organism that causes disease
what is a communicable disease
a disease that can spread between organisms
what diseases are caused by bacterium
TB, bacterial meningitis, ring rot
what does TB affect
animals, typically humans and cattle
what does bacterial meningitis affect
humans
what does ring rot affect
potatoes and tomatoes
what diseases are caused by viruses
HIV, influenza, tobacco mosaic virus
what does HIV affect
humans
what does influenza
animals including humans
what does tobacco mosaic virus affect
plants
what diseases are caused by fungus
black sigatoka, ringworm and atheletes foot
what does black sigatoka affect
banana plants
what does ringworm affect
cattle
what does athletes foot affect
humans
what is direct transmission
disease transmitted directly from one organism to another
what are examples of direct transmission
droplet infection, sexual intercourse and touching
how is HIV transmitted directly
sexual intercourse between humans
how is athletes foot transmitted directly
can be spread via touch
what is indirect transmission
when a disease is transmitted from one organism to another via an intermediate
how is malaria transported via indirect transmission
mosquitoes acting as vectors
how is potato/ tomato blight transported indirectly
when spores are carried between plants
how does overcrowding increase the transmission of communicable diseases
it is spread via droplet infection and bacteria can also remain in the air for long periods of time
how does climate affect the transmission of communicable diseases
malaria is the most common in tropical countries which are humid and hot because they are ideal conditions
