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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.
Assessment Infective endocarditis is characterised by insidious onset of fever, malaise, night- sweats and weight loss. Other signs include vomiting, fatigue, headache, mya
Which of the following pairs of functional groups CANNOT react with each other by a dehydration reaction? Select one: a. Carboxyl;Hydroxyl b. Carboxyl;Sulfhydryl c. Pho
Why do cells of the nephron tubules present a great amount of mitochondria? The cells of the tubule wall have high number of mitochondria because lots of substances are resorbe
Formation of cocoon in earthworm: In earthworm segments from 14 to 17 are swollen. Skin on these segments is thick and glandular. This is called clitellum. When ovaries ma
animal body organization
VENTIL A TIO N OR BREATHING - 15-16 / minute (In Rabbit 36-38). In children 35 / 1 minute. 1 . INSPIRATION In take of air is known as inspiration. First o
Q. What are mycotoxins and How are they harmful? • Mycotoxins are toxins (secondary metabolites) produced by filamentous fungi on food and feed that cause illness when ingested
what are the general characteristicss of porifera
During the course of a physiology laboratory, a student finds that her PR interval is 0.24 second. Concerned, she takes her own ECG again an hour later and sees an area of the ECG
Q. What is Barr body Genes? Located inside nuclear envelope, it's a densely staining object which is an inactivated X chromosome in female mammalian cells. Most Barr body genes
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