4.3.1.2 Viral diseases

What are the symptoms to measles?

Fever and red skin rash, can lead to other problems such as pneumonia and blindness

How is measles spread?

Droplet infection

How is measles being prevented?

Vaccinations for young children to reduce transmission

What are the symptoms to HIV?

Initially flu-like symptoms, then the virus attacks the immune system and leads to AIDS

How is HIV spread?

By sexual contact or exchange of bodily fluids such as blood

How is HIV being prevented?

Using condoms, not sharing needles, screening blood when it is used in transfusions and the use of antiretroviral drugs to stop the development to AIDS

What are the symptoms of tobacco mosaic virus?

Discolouration of the leaves, the affected part of the leaf can’t photosynthesise

How is tobacco mosaic virus spread?

Contact between diseased plants and healthy plants, insects act as vectors

How is tobacco mosaic virus being prevented?

Good field hygiene and pest control, growing TMV-resistant strains