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Q. What is dengue?
The Dengue, or dengue fever, is an epidemic disease in some countries (for instance, in Brazil), and its most dangerous form is hemorrhagic dengue. It is cause through four different but related viruses, the reason that it is difficult for an already infected person to become immunized against the disease. The Dengue is prevalent in subtropical and tropical regions of Asia, Africa and South America and it is transmitted by the bite of the Aedes aegypti mosquito, a diurnal mosquito. The viral infection causes diverse symptoms similar to flu, like malaise, fever, myalgia (muscle pain); in hemorrhagic dengue high fever, without or with convulsions, and hemorrhages may take place leading to circulatory failure and death. There is no vaccine to cure dengue since there are four agent viruses and it is supposed that the severity of the disease is greater when the patient is already protected against one kind of virus and is infected by another. The best prophylactic process is to eliminate the vector mosquito.
Q. How sex occurs in bacteria? Occurrence of sex in bacteria was first described by Edward Tatum and Joshua Lederberg in 1946 (Nature, volume 158, page 558) who were studying m
what are the theories of animal classification
Excretory organ of lizard.
Making leaf collections Collect young leaves of as many varieties of plants as possible. Place various layers of news- paper or blotting paper on a firm, smooth board. Next org
difference between the respiration occurs in lower and higher organisms
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Osseus defects around implants. They are classified into four main groups. Group I defects: These demonstrate moderate horizontal bone loss with a minimal intrabony component
Metalimnion - Summer Stratification This zone lies below the epilimnion and above the hypolimnion and thus forms the intermediate layer which is non-circulating. The metalimni
Gel shift assay is a technique by which one can determine whether a particular protein preparation contains factors which bind to the specific DNA fragment. At times when a radiol
What are general characteristics of phylum porifera?
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