Sunlight allegedly making varicella-zoster virus causes chicken pox in the skin become inactive. Because of that sun exposure is considered effective in preventing the spread of this highly contagious virus.
Transmission of measles virus very easily, especially if spread by coughing or sneezing fluid from patients in early infection. Another mode of transmission is through contact with liquid smallpox.
Chicken pox is currently endemic in European countries, according to experts due to sunlight at least a factor there. That's why chicken pox is more rarely found in areas of high exposure to sunlight.
Dr.Phil Rice from St.George 's University, London, analyzed data from 25 studies on the varicella-zoster virus in various countries and then compare them with climatic factors.
Nevertheless he found the data interesting that the peak incidence of chicken pox in India and Sri Lanka took place in summer and dry.
"It happened because of atmospheric pollution so that exposure to ultraviolet light in this season is lower compared with the rainy season," he said.
Factors that also contribute to UV rays is the temperature, humidity, and other social environmental conditions.
resource:
http://health.kompas.com/read/2011/12/20/06574880/Sinar.Matahari.Cegah.Penularan.Cacar.Air
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