New answers tagged parasitology
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This is pear rust (Gymnosporangium sabinae).
It is fairly widespread in the northern hemisphere:
It is a fungal infection and affects pear trees from junipers. Pruning the affected nearby junipers can help control its spread.
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This page seems to indicate that it adheres to the epithelium of different internal organs. They write:
The sporozoites are released and parasitize epithelial cells (b, c) of the gastrointestinal tract or other tissues such as the respiratory tract.
Here is the figure from that page:
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