communicable disease + pathogens

• pathogen- a microorganism that causes disease in a host organism

  or a micro organism that causes disease: bacteria,viruses, fungi or protists
• viruses: some infect and reproduce in other cells by replicating their DNA and protein coat (lytic pathway) while others (phages) reproduce by insetting DNA into cells which causes them to produce more copies (lysogenic pathway).cell bursts (lysis) releasing them

  HIV:destroys white blood vessels leads to aids

  Ebola:causes haemorrhaging(internal bleeding) vector:bodily fluids
• Bacteria

  release toxins into your body that damage cells

  cholera:causes diarrhoea. vectors: water

  tuberculosis:causes lung damage. vector: air(airborne)
• fungi

  damage cells

  cholera ask dieback:causes leaf loss and bark lesions on plants
• protists

  single celled organisms

  malaria: damage red blood cells and liver.

  vector: mosquitoes
• vector:an organism that does not cause disease itself but which spreads infection by conveying pathogens from one host to another.