why do we fall ill

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Across
  1. 4. Covid-19 spread through this means
  2. 6. Malfunctioning of any organ or body part
  3. 8. It can be an immediate cause of disease
  4. 10. A vector for spreading diseases
Down
  1. 1. Salmonella typhi causes this disease
  2. 2. A disease that can be spread by sexual contact
  3. 3. A chemical produced by the body to fight infections
  4. 5. Quinine is used to kill this pathogen
  5. 7. A disease caused by the bite of mosquitos in Japan
  6. 9. An organism that doesn't have a biochemical pathway