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There are many different sizes of parasites including single-celled protozoa and multi-celled parasites like worms, flukes, and even insects. Some other small parasitic creatures are called filaria, richettsias and spirochettes. Fungi and yeasts are parasitic plants.
Single-celled protozoa: The smallest parasites are single-celled protozoa. Some of these diseases include:
Insect parasites: humans can be infested or fed upon by a variety of insects including lice, fleas, flies, mosquitoes, ticks, and so on. The majority of these are not diseases themselves, but rather transmit other parasitic diseases such as malaria (mosquitoes), sleeping sickness (tsetse flies), or Lyme disease (deer ticks). However, a few directly insect-caused diseases are common:
Antibiotics and parasites: Although antibiotics are better known for their use against bacteria, there are many parasitic infections that are treated by antibiotics.
Vaccinations and parasites: The development of vaccinations against parasitic infections has not been as effective as vaccines against viruses or bacteria.
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