Why do we fall ill

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Across
  1. 3. Virus causing Jaundice
  2. 6. Bacterium responsible for peptic ulcers
  3. 7. Process of introducing a weakened pathogen inside the body of the host for the production of antibiotics
  4. 8. Diseases continues for many days and causes effect on the body
Down
  1. 1. Body's power to fight against infection
  2. 2. Microorganisms causing acne
  3. 3. Physical, mental and social well-being and comfort
  4. 4. sexually transmitted disease
  5. 5. a disease transmitted by mosquito
  6. 7. Living organisms carrying the infecting agents from one person to another