Manx shearwaters frequently carry feather lice (Mallophaga) most of which are either the feather-eaters in the groups Ischnocera, or Amblycera, which also consume blood. The most common are the ischnocerans "Halipeurus diversus" and "Trabeculus aviator". The nests of breeding birds frequently contain the shearwater flea; "Ornithopsylla laetitiae" is also commonly present, which shares a common ancestry with North American rabbit fleas. Where their burrows are near those of Atlantic puffins, the tick "Ixodes uriae" is common. The mite "Neotrombicula autumnalis" is often present, and has been implicated in spreading puffinosis. Puffinosis is a viral disease of in which young birds get blisters on their feet, conjunctivitis, and problems with movement. The death rate can reach 70% in infected birds. Internal parasites include the tapeworm "Tetrabothrius cylindricus".