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Scabies (also sometimes known as the seven-year itch) is a contagious human skin infestation by the tiny (0.2–0.45 mm) mite Sarcoptes scabiei, variety hominis. The word is from Latin: scabere, lit. 'to scratch'. The most common symptoms are severe itchiness and a pimple -like rash. Occasionally, tiny burrows may appear on the skin. In a first-ever infection, the infected person usually ...
Tropical diseases are diseases that are prevalent in or unique to tropical and subtropical regions. [1] The diseases are less prevalent in temperate climates , due in part to the occurrence of a cold season, which controls the insect population by forcing hibernation .
The World Health Organization classified 20 major diseases as neglected tropical diseases (NTD), while finer classifications consider several additional conditions. [4] The diseases collectively had affected almost 2 billion people worldwide every year, causing about 200,000 deaths and almost 50 disability adjusted life years annually.
Tropical medicine requires an interdisciplinary approach, as the infections and diseases tropical medicine faces are both broad and unique. Tropical medicine requires research and assistance from the fields of epidemiology, microbiology, virology, parasitology, and logistics. Physicians of tropical medicine must have effective communication ...
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العربية; অসমীয়া; Azərbaycanca; বাংলা; Башҡортса; Беларуская; Беларуская (тарашкевіца)
Infectious diseases have played a significant role in human history, impacting the rise and fall of civilizations and facilitating the conquest of new territories. [16] During recent decades, there are significant regional changes in vector and pathogen distribution reported in temperate, peri‐Arctic, Arctic, and tropical highland regions.
The critical community size (CCS) is the minimum size of a closed population within which a human-to-human, non-zoonotic pathogen can persist indefinitely. [1]When the size of the closed population falls below the critical community size level, the low density of infected hosts causes extinction of the pathogen. [2]