Biology
Biology, 10.08.2019 00:30, lechinastarks317

The slow accumulation of genetic changes to an influenza virus over time is referred to as

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Biology, 07.07.2019 12:00, kingteron5870
Every year, a new influenza vaccine is developed. what is the most likely reason that doctors do not use the same vaccine each year? a. the vaccine turns into a new virus that causes a recurrence of the same influenza each year. b. the virus which causes influenza adapts each year to the last vaccine in order to survive and reproduce. c. any vaccine can only last for a year before it dies. d. a new, different virus that causes influenza enters the food chain through plants about once every year, infecting humans.
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Biology, 19.07.2019 22:20, gracebuffum
The influenza virus, commonly referred to as the flu, is an rna virus that infects birds and mammals. upon infecting a host cell, the virus copies its rna genome using a viral polymerase. once the rna is copied, it is translated by the host cell into the viral proteins needed to package additional viral particles. there are three strains of influenza, but most humans in the united states are infected with strain a. this particular strain constantly changes, due to the high mutation rate of the rna copying machinery and the ability of the viral rna segments to undergo reassortments. although there are different influenza vaccines offered each year, it is estimated that the influenza virus still infects between 5% and 20% of the united states' population annually. which characteristic of the influenza virus best explains why there is a different influenza vaccine offered each year?
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History, 06.10.2019 22:00, SMURFETTE86
What was significant about the 1918 influenza virus? a) it was the first time the virus had originated from birds. b) soldiers returning from overseas introduced the virus into the united states. c) the virus spread quickly and killed millions of people worldwide. d) it led to the development of an influenza vaccination. , which of these are correct?
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