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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.
State the phases of soil genesis Soil genesis embodies two distinct phases. One is weathering that involves disintegration and decomposition of rocks and minerals, the other is
Female reproductive system of frog: i) Ovaries : a) There are a pair of ovaries present in the abdomen. b) They are grayish or blackish in colour. c) There are numerous cham
Define Determinants of Food Security - Vulnerability? It is the fourth critical variable and defines the risk factor to which a person, family, community or nation is exposed o
How do homeotic genes regulate development in Drosophila? Homeotic genes code for regulatory proteins that are thought to control the rate of cell division in various body area
Characteristic Feature of Respiration From our opinion we may say that the characteristic feature of respiration is the intake of oxygen and the output of the carbon dioxide.
Respiratory system of Crustacea ?
KARYOTHEC A OR NUCLEAR MEMBRANE It is also called Nucleolemma, term given by Erclab & Hertwig. Karyotheca composed of two unit membranes separated by a 150-300 A° wide p
Q. Why we use Histamine in consciousness? Histamine is involved in controlling the level of consciousness during waking. The level of histamine diminishes during sleep and its
What is sustainable agriculture? Describe the contribution of biopesticides and biofertilisers in sustainable agriculture.
Q. What is the difference between carriers of HIV and AIDS patients? A person be able to be a carrier of the HIV without necessarily being affected by the immunodeficiency synd
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