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Eggs hatch after about a week and become nymphs, which look like smaller versions of the adults. The nymphs undergo three molts before becoming adults. Adults are 1.5–2.0 mm long and flattened. They are much broader in comparison to head and body lice. Adults are found only on the human host and require human blood to survive.
Trichinella spiralis can live the majority of its adult life in the intestines of humans. To begin its life cycle, T. spiralis adults invade the intestinal wall of a pig, and produce larvae that invade the pig's muscles. The larval forms are encapsulated as a small cystic structure within a muscle cell of the infected host.
Without treatment, symptoms typically resolve within three months. [5] Worldwide, about 10,000 infections occur a year. [6] At least 55 countries including the United States, China, Argentina, and Russia have had recently documented cases. [5] While the disease occurs in the tropics, it is less common there. [5]
Head lice bites on the back of the neck Adult male (left) and female (right) head lice Head lice are generally uncomfortable, but typically do not constitute a serious condition. [ 7 ] The most common symptom is itching of the head, which normally worsens 3 to 4 weeks after the initial infestation.
Trichuris suis is a whipworm; the variations in thickness of the anterior and posterior segments give the parasite the characteristic "whip-like" appearance.Adult females measure 6 to 8 cm and adult males 3 to 4 cm. T. suis eggs are oval (60 × 25 μm) and yellow-brown with bipolar plugs. [1]
Blue eye disease is a viral disease that is commonly identified by encephalitis, pneumonia, and respiratory diseases in piglets. It also causes reproductive failure in adult pigs, and rarely identifies with corneal opacity, an eye disorder characterized by scarring of the cornea.
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