A parasite is one of a group of organisms (e.g., bacteria) that live on a host body, and are capable of transmitting or causing disease to the host. Parasites are microscopic in the size of a grain of sand, and they have the capacity to live for long periods of time on a host, without being killed. When they do die, they can be expelled by the host's tears or feces. Parasites can be transferred from one person to another through sexual contact, the sharing of bedding, or by consuming food or water that is contaminated with feces and/or blood. Some parasites have been shown to be more infectious to the host than others (for example, certain types of worms are more infectious to people than other worms). A parasite is generally not considered to be a disease until it has been shown to cause disease. For example, an athlete infected with a worm will develop a muscle disorder known as muscle cramps, but not a disease. The symptoms of a parasite can include a headache, fever, body aches, nausea, abdominal pain, and vomiting. Parasites can cause infection (especially if the parasites infect cells in the host's body), a swollen or painful lymph node (which can make people feel sick), and a rash or hives on the skin (or elsewhere in the body).
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