Wiki Sumber Informasi iSIKHNAS

• developing a resistant form that can survive for a long time in the environment (anthrax spores, helminth eggs, toxoplasma cysts)
• continual transmission to susceptible hosts through:
  • rapid infections that cause little immune response, or
  • by altering their genetic makeup to avoid any immunity that developed against previous forms
• forming persistent infections in host animals (Johnes disease, tapeworm, maedi-visna virus, BVD)
• developing the capacity to infect multiple different species to increase likelihood of continual transmission (Nipah virus infects bats, pigs, humans, rabies infects all mammals)
• avoidance of any external or environmental forms as a way of avoiding dying in the external environment (trichinella species)