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17 Cards in this Set
- Front
- Back
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Give 3 examples of viral diseases |
HIV TMV (tobacco mosaic virus) Measles |
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How is HIV spread? |
Through sexual contact or by exchanging body fluids such as blood. This can happen when people share needles taking drugs |
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When you get HIV, what happens initially? |
You get flu-like symptoms for a few weeks |
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Usually, there are... |
NO symptoms for several years |
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What can you take if you know you have HIV? |
Antiretroviral drugs which can control the HIV |
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What do the antiretroviral drugs do? |
Stop the virus replicating in the body. |
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What does the virus (HIV) attack? |
Immune cells (cells from the immune system). If the body's immune system is badly damaged, it can't cope with other infections or cancers. |
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What is the late stage of HIV called? |
AIDS (when the immune system is badly damaged) |
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What does tobacco mosaic virus affect? |
Many plant species, e.g. tomatoes |
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What does TMV cause? |
A mosaic pattern to form on the leaves |
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What else happens to plants with TMV? |
Parts of the leaves become discoloured/yellow (chlorisis) |
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Why is this a bad thing? |
It means the plant isn't performing photosynthesis as well, so the virus also caused stunted growth. (The plant doesn't have enough chloroplasts) |
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How is measles spread? |
Through droplets of an infected person's sneeze or cough |
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What do people with measles develop? |
A red skin rash and signs of a fever (high temperature) |
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Is measles bad? |
It can be very serious or even fatal if there are complications |
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What 2 things can measles lead to? |
Pneumonia (a lung infection) or encephalitis (a brain infection) |
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Why are measles very rare now? |
Most people are vaccinated against measles when they're very young |
