(A) Explain the Mechanism That Leads to Rapid Evolution of the Virus

question 53

Essay

(a) Explain the mechanism that leads to rapid evolution of the virus that causes influenza. (b) Distinguish between antigenic drift and antigenic shift, and explain the significance of each to influenza evolution and the occurrence of influenza in humans.

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Definitions:

Operating Activity

Tasks and transactions related to the core business functions of an organization, such as selling products or services and manufacturing.

Cash Received

The total amount of cash a company collects from its various sources, including operations, financing, and investing activities, during a period.

Indirect Method

A method of computing the net cash provided by operating activities that starts with net income and adjusts it to a cash basis.

Operating Activities

These are the day-to-day actions that are involved in running a business which affect the cash flow but are not investing or financing activities.