Viral diseases

Symptoms

• fever
• red skin rash

How is it spread?

Droplet infection 

Prevention

Vaccination for young children to reduce transmission

Symptoms

• Flu-like symptoms 
• Eventually leads to AIDS

How it is spread?

Sexual contact or exchange in bodily fluids

Prevention

The spread - Using condoms, not sharing needles, mothers with HIV bottle-feeding their children instead of breastfeeding

The development to AIDS- Use of antiretroviral drugs (stop the virus replicating in the body)

Symptoms

• Discolouration of leaves- the affected part of the leaf cannot photosynthesize resulting in the reduction of the yield

How it is spread

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

How it is being prevented

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