Types of subclinical infections
The following pathogens (together with their symptomatic illnesses) are known to be carried asymptomatically, often in a large percentage of the potential host population:

Host tolerance
Fever and sickness behavior and other signs of infection are often taken to be due to them. However, they are evolved physiological and behavioral responses of the host to clear itself of the infection. Instead of incurring the costs of deploying these evolved responses to infections, the body opts to tolerate an infection  as an alternative to seeking to control or remove the infecting pathogen.Subclinical infections are important since they allow infections to spread from a reserve of carriers. They also can cause clinical problems unrelated to the direct issue of infection. For example, in the case of  urinary tract infections in women, this infection may cause preterm delivery if the person becomes pregnant without proper treatment. See also
References
Further reading
Endara, Pablo; Trueba, Gabriel; Solberg, Owen D.; Bates, Sarah J.; Ponce, Karina; Cevallos, William; Matthijnssens, Jelle; Eisenberg, Joseph N.S. (April 2007). "Symptomatic and Subclinical Infection with Rotavirus P[8]G9, Rural Ecuador". Emerging Infectious Diseases. 13 (4): 574–580. doi:10.3201/eid1304.061285. PMC 2391297. PMID 17553272.
Epidemiology
Xanthelasma is a rare disorder in the general population, with a variable incidence of 0.56 to 1.5% in western developed countries. The age of onset ranges from 15 to 75, with a peak in the 4th to 5th decades of life. There also seems to be a greater prevalence in females, but this might be due to higher consciousness to cosmetic defects. Etymology
The word is derived from Greek xanthós, ξανθός yellow and élasma, έλασμα, foil. The plural is xanthelasmata. See also
Xanthoma, a similar collection of cholesterol around tendons
List of xanthoma variants associated with hyperlipoproteinemia subtypes

References


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