yes, you would not believe how dangerous. be careful when touching it, it can cause infections and if they are not treated then it can cause sever long term affects.
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no
Some species can cause disease in humans
dysentary
by getting in your bloodstreams
Malaria
polio
Ticks are often harmful to humans. For instance, the sheep tick could cause Lyme disease in humans.
You would speak of Spirogyra in terms of the species of Spirogyra: "there are over 400 species of Spirogyra"
Babesiosis is a disease mainly caused by ticks. This disease is similar to malaria and can cause severe anemia.
viruses