Disease

• Fungal disease :

  Rose black spot: Causes purple or black spots t appear on leaves which cause it to turn yellow and die. Leaves dying means that less photosynthesis happens which causes plants growth to be stunted. It is spread by water or wind. Using fungicides and stripping plant of affected leaves and destroying them can help prevent the spread of disease.
• Bacteria:

  Salmonella: Causes food poisoning and fever ,cramps, vomiting and diarrhoea. It is caused by eating contaminated foods. To prevent the spread of disease you can vaccinate chickens and clean and cook food properly. Infected people should have antibiotics.
• Bacteria:

  Gonorrhoea: causes pain hen urinating and yellow or green discharge from vagina or penis. It is a sexually transmitted disease so to prevent it use barrier methods and have antibiotics.
• Protist:

  Malaria: causes repeated fever episodes. It is spread by vectors (mosquitoes). To prevent them use insecticides or mosquitoes nets.
• Viruses:

  Measles: causes red skin rashes and fevers. It can also led to pneumonia and inflammation of the brain. This can be prevented by being vaccinated when young.
• Viruses:

  HIV: causes flu like symptoms for weeks. The virus destroys immune cells. When immune system because badly damaged it then becomes aids. It is transmitted by exchange of bodily fluid and by sex. It is prevented by safe sex and using different needles. Infected people should have antiretroviral drugs.
• Viruses:

  Tobacco mosaic virus: causes mosaic patterns on leaves and leaves become discoloured. Discolouration affects photosynthesis which affects growth. Prevented by destroying infected plants.
• Preventing disease:

  1. being hygienic
  2. destroying vectors
  3. isolation
  4. vaccination