Patho

• Modes of Infectious Disease Transmission

  General transmission and Human to human transmission
• Abiotic environmental factors


  • Inhalation of spores
  • Wind
  • Water
  • Entry into skin
  • Animal vectors
• Animal vectors


  • Mosquitoes (malaria, dengue)
  • Fleas (bubonic plague)
• Direct contact


  Pathogen survives best inside the body
• Direct contact


  • HIV
  • Herpes viruses
  • Ebola
• Indirect contact


  • Pathogen survives harsh environment
  • Pick up pathogen from surface or air
• Indirect contact


  • Influenza
  • Norovirus
• Droplets


  Pathogens are in droplets, but do not survive long this way
• Droplets


  • Ebola
  • Bordetella pertussis
• Airborne


  Pathogens aerosolized and stay infective
• Airborne

  • Influenza
  • Tuberculosis
• Fecal-Oral

  Through contaminated water or food
• Fecal-Oral


  • Cholera
  • Norovirus
  • Shigella
• Non-Infectious Disease


  Disease not caused by pathogens
• Classification of Disease