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To complete the picture, two such somatic protective cells surround each maturing sperm cell, and those encysting somatic cells send signals to the sperm cell on how and when to mature.
A small number of the parasites may complete the entire life cycle instead of encysting in tissue, but the probability that these trypanosomes will be taken in a blood sample is low.
Tissue lesions caused by pentastomids are most common in the larva and nymphal stages (due to their migratory process when organs can be perforated) and during encysting (which can cause marked granulomatous inflammations (Ambrose and Riley, 1988; Boyce and Kazacos, 1991).
All known species develop in invertebrates, especially insects, but the larvae are capable of encysting (without development) in a wide range of animals, including vertebrates (Poinar, 2001; Schmidt-Rhaesa, 1997; Smith, 2001).
The conformism and tactical forgetfulness encysting us ruptures sometimes, cedes before the pressure of the real.
The classic symptoms of periorbital edema, fever, and myalgia occur when the larvae are encysting in the muscle, approximately 2-3 weeks after the infected meat is eaten.
Two most important factors influencing the incidence of paramphistomosis are adequate temperature and moisture in the environment, which helped the hatching of fluke ova, the viability of encysting cercariae and population of snails.