Their immune system:.̶̫̀̇͋̃̆͋̈̆̽̈́̏̚.̸̥̤̤̹̣̻̪́̀̾́̐̉̀̈̅̆̎̎̔̄̚.̶̢̗̳͈̬͇͍͎̼͌̿̈́̇.̶̛̙͇̫͍̹̣̖͙̮̐̋͑̆̽͗̉͝.̸̨̨̘͙͈̜̙͙̂̅ͅ.̴͇̗͍̹̜̎̽̀͗̂̄̽͌̈́̉͗̇̐̾̾.̸͙̰̿́̀́̀.̸̡̺̪̱̞̩̪̝̫̭̟̝̺̜̊̿͑̀̀ͅ.̷̢͔͕͕̺̲̩̞̺̳̿̋̊͑̋́̈̏͗̌̊̈́̕̚͜͝.̴͕͉̪͎̺̈.̸̬͉̝͈͎̤̼̟̥͋͋.̴̜̦͒͛͋̔̅̂͝.̷͕̦̹̹̫̤̼̠̞̗̂̊̔̉͝.̸̭͋́̓̎̓͂͜.̶̡͇̲̯̰͙̱̬͗͋̓͠