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What is the virus that causes flu? Why doesn't the body create permanent immunity against that virus? How does the vaccine against flu work?
Flu is a disease caused by the influenza virus, a highly mutant DNA virus. Because of the high mutation rate of the virus, that forms many dissimilar strains, flu always presents epidemic features in affected populations and people may have some flu episodes during life (the immune response made from previous infections is not efficient in future infections).
The vaccine against flu is a vaccine made of attenuated virus of three dissimilar strains. Each year the WHO (World Health Organization) researches and determines which are the strains that should compose the vaccine. This is a method to face the high mutation rate of the virus.
Alfred Sturtevant and Seymour Benzer's studies of recombination in both Drosophila and bacteriophage demonstrated which of the following? A. The gene is an indivisible unit and
Do all vascular plants develop annual rings? Vascular plants are those, which have phloem and xylem structures within them to transport water and nutrients around the plant. Mo
drawandlabelthemajorendocrineglandsinthehumanbody
Ecology is divided into two fields: (a)Autecology (b) Synecology (a) Autecology: it deals with life history, population dynamics, behavior etc of a single
What does skin color in man shows?
Carpentier -Edwards Valve (C-E) : This is porcine aortic valve preserved in gluteraldehyde and mounted on flexible stent made of cobalt-chromium-nickel alloy (ELGILOY). Glut
Q. What is the difference between cerebrum and brain? What are the major parts of these structures? The concept of brain or encephalon comprehends the cerebrum mostly referred
An 22 year old man is admitted to the emergency department after an automobile accident. He has not lost a large amount of blood, but he suffers from a severe crush injury to hi
what is genitalia?
Define Viscosity and Consistency of Protein Systems? Viscosity and consistency of protein systems are the important functional properties in fluid foods, such as beverages, sou
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