Viral Diseases

• Viruses

  Reproduce inside cells damaging them and are not killed by antibiotics as they are protected by body cells
• Measles

  Symptoms- Fever and red skin rash

  Spread- Inhalation of droplets from coughs and sneezes

  Prevention- Vaccinations
• HIV


  Symptoms- Flu like illness and then causes attack on WBC leading to infections.Aids then occur when immune system can’t defend against infections

  Spread- Exchange of bodily fluids such as blood and semen

  Prevention-Antiretroviral drugs but no cure for Aids
• Tobacco Mosaic Virus

  Symptoms-Mosaic pattern of discolouration on leaves of infected plants which affects growth due to lack of photosynthesis

  Spread-Contact or contaminated tools

  Prevention- Removing infected leaves,cleaning tools and rotating crops