... dogs, cats, and wild animals had also been poisoned.
A mysterious plant spore containing several chemicals may be the cause of the problems. Vitamin A deficiency contributes to blindness in nonruminants, such as cattle and swine, by making the cornea very dry and damaging the retina and cornea. The spores may contain carcinogens that can cause respiratory and immune system problems in both animals and humans. The young fronds of bracken are ingested as human food, especially in North America. They contain significant quantities of the carcinogen.
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