5.4 Viral Diseases Flashcards
What do viruses do?
- can infect and damage all types of cells
- viral diseases often start relatively suddenly
- the symptoms are the result of the way the body reacts to the viruses damaging and destroying cells as they reproduce
Have scientists developed medicines to cure viral diseases?
No, so it is important to stop them spreading
Measles symptoms
- fever
- red skin rash
- red sore eyes
How do viruses cause damage?
Viruses are smaller than bacteria and have a regular shape, taking over cells and live and reproduce in cells, damaging and destroying them
ways measles is spread
inhalation of droplets from coughs and sneezes
ways to reduce spread of measles
vaccine
isolated
treatment for measles
nothing
ways HIV is spread
Direct sexual contact, exchange of bodily fluids such as blood. Sharing needles, unscreened blood used for transfusions. Can be passed from mother to child in breast milk
Ways to reduce spread of HIV/AIDs
condoms
not sharing needles
screening blood used for transfusions
bottle-feeding
antiretroviral drugs
symptoms of HIV/Aids
mild flu
treatment for HIV
no cure
ways tobacco mosaic virus is spread
contact between diseased plant material and healthy plants
Insects act as vectors
ways to reduce spread of tobacco mosaic virus
good field hygiene
good pest control
remove all decaying leaves from plant and burn them
Symptoms of tobacco mosaic virus
discoloration on the leaves, small patches of light green, brown or yellow
treatment for tobacco mosaic virus
no treatment
TMV - resistant strains of many crop plants
