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viral diseases (tobacco mosaic virus (controlled by (destroying pests…
viral diseases
tobacco mosaic virus
common plant virus
enters through damaged epidermis
distinct mosaic
discolouration pattern on the leaves
affects growth
photosynthesis cannot occur as efficiently
controlled by
removing affected leaves
destroying pests
which causes initial epidermal damage
rose black spot
leaves
often turn yellow
spots develop
purple
black
drop off
photosynthesis is reduces
growth is affected
as a result
fungal spores spead
wind
water
treatments
leaf removal
burning leaves
spray with fungicide
a pesticide
used to kill fungus
measles
symptoms
fever
red skin rash
fatal
if complications occur
can be spread by inhaling droplets
containing the virus
from sneezes and coughs
can be controlled
vaccinations
HIV
causes a flu-like illness
initially
spread by sexual contact
or exchange of body fluids
blood
sharing needles
drugs
can be successfully controlled
antiretroviral drugs
if not
the virus will attack the body's immune cells
last stage
occurs when the body can't cope
immune system
other infections
cancers
gonorrohoea
sexually transmitted disease
STD
spread by bactria
causes thick yellow or green discharge
from the penis or vagina
and pain when urinating
can be controlled
antibiotics
barrier methods
contraception
condoms
easily treated
antibiotic penicillin
until many resistant bacterial strains were found
malaria
spread by mosquitoes
feeding on infected blood
and then biting a human
causes protist
mosquitoes are vectors
they pass on malaria
don't suffer themselves
symptoms
can be fatal
recurrent fever
can be prevented
stop the spreading
stop mosquitoes from breeding
use nets
to avoid being bitten
salmonella
food poisoning
spread by
bacteria ingested in food
on food prepared in unhygienic conditions
bacteria secrete toxins
symptoms
fever
abdominal cramps
diarrhoea
vomiting
in the UK
poultry are vaccinated
against salmonella
to control it
stop the disease from spreading