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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.
Q. What do you mean by pollen? Pollen grains are the male gametophytes of the phanerogamic (flowering) plants So within the pollen grains the male gametes of these plants are f
Group Psychotherapy: Definition Group psychotherapy is a treatment of psychological problem in which two or more patients interact in the present of a psychotherapist.
Reducing Cost of Accident One clear way to control the cost of accident would be to follow all the rules of book for safety. All the methods of safety which were described ear
What are angiosperms, the flowering plants? What is the major feature that distinguishes them from the gymnosperms? Flowering plants have flowers and seeds (phanerogamic plants
essay on respiratory structures of living organisms
name the excretory ogran and waste product formed in various types of animals
Whey Protein Concentrates You already know that whey is the residual liquid substance that is obtained by separating the coagulum from milk during cheese making. There are imp
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D i s e a s e s of Cardiovascular and Haemopoietic System Cardiovascular system maintains circulation of blood for normal exchange of fluid, electrolytes, oxygen and nut
1. In cattle, the polled condition (H) is dominant to the horned condition (h). A cross between an individual with red coat (R) and white coat (W) results in roan (RW). A polled, r
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