KARACHI - Present scorching weather will help government to control over the epidemic-like situation of the dengue fever in the metropolis as the breeding of Aedes aegypti mosquitoes, causing fatal dengue fever, are cut short in over 30 degree centigrade. Talking to The Nation, Prof Dr Syed Jamil Hasan Kazmi, an expert in mosquito species and Chairman Geography Department, Karachi University, said that less than 50 per cent humidity also help in declining the growth of the said type of mosquitoes. He said that the temperature from 22 to 30 degree centigrade help in the breeding of mosquitoes. He said, "It is a largely urban phenomenon that unprecedented growth in urban areas without adequate infrastructure was contributing to the factors responsible for dengue outbreak. The Aedes aegypti mosquito bites during the day, lives indoors in domestic settings and breeds in both clean and polluted water, while adult mosquito was destroyed in temperature beyond 38C, the eggs can withstand desiccation and can hatch next year as well whenever conditions are conducive. Conversely the City has faced over 43 degree centigrade temperature during last three or four days." During the summer, people usually store water in large quantity in different pots at their houses. Such water pots provide shelters to mosquitoes causing mosquito-borne infection that causes a severe flu-like illness, and sometimes a potentially lethal complication called dengue haemorrhagic fever, he said. "Dengue is transmitted by the bite of an Aedes mosquito infected with anyone of the four dengue viruses. It occurs in tropical and sub-tropical areas of the world. Symptoms appear after 3-14 days of the infective bite," he added.    According to focal person of the dengue surveillance cell, about 15 new patients suspected with dengue fever were reported from different hospitals of the City. With addition of new cases, over 55 patients have been admitted to hospitals. Around 571 dengue fever patients had been brought to the hospitals since January 2008 to date. However 163 out of total figures were declared confirmed with the disease. It is worth mentioning that WHO currently estimates that there may be 50 million dengue infections worldwide every year. In 2007 alone, there were more than 890,000 reported cases of dengue in America, of which 26,000 cases were DHF.  The disease is now endemic in more then 100 countries in Africa, the Americas, the Eastern Mediterranean, South-east Asia and the Western Pacific. Southeast Asia and the Western Pacific are the most seriously affected. Before 1970 only nine countries had experienced DHF epidemics, a number that had increased more than four-fold by 1995. Dr Kazmi cautioned the citizens to prevent themselves from mosquito bites by taking protective measures, including wearing appropriate dresses, using repellents and insecticides and watching against any collection of water even small puddles. The water collected under air-conditioned vents, and even unused WCs in the house can serve as breeding grounds for Aedes aegypti mosquito.