In Influenza Virus,antigenic Shift

question 27

Multiple Choice

In influenza virus,antigenic shift

• A)results from reassortment of genomes when two different strains of flu viruses infect the same cell.
• B)results from the accumulation of mutations in HA and NA in a single strain of flu virus.
• C)can result in major epidemics or pandemics.
• D)results from reassortment of genomes when two different strains of flu viruses infect the same cell and can result in major epidemics or pandemics.

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Definitions:

Cohort Study

An observational study design that follows a defined group of people (a cohort) over time to assess how their exposures affect their outcomes, useful for identifying risk factors and causation.

Cardiovascular Disease

A class of diseases that involve the heart or blood vessels, including coronary artery disease, hypertension, heart failure, and stroke.

Odds

The ratio of the probability of an event occurring to the probability of it not occurring.

Case-Control Study

is an observational study design in which two groups differing in outcome are identified and compared on the basis of some supposed causal attribute.