Question

how to make a flu vaccine
what is the correct order of the steps involved in producing an influenza vaccine?

1. inject viruses into eggs and incubate
2. select 3 flu strains
3. inactivate or weaken viruses
4. collect data on flu strains
5. open eggs and collect viruses
6. combine the 3 viruses to make vaccine

Explanation:

To determine the correct order for producing a flu vaccine, we follow the logical sequence of vaccine development:

Step 1: Collect data on flu strains

First, data on circulating flu strains must be collected to identify which strains to target.
Action: Collect data on flu strains (Step 4).

Step 2: Select 3 flu strains

Using the collected data, 3 relevant flu strains are selected for the vaccine.
Action: Select 3 flu strains (Step 2).

Step 3: Inject viruses into eggs and incubate

The selected virus strains are injected into eggs (e.g., chicken eggs) and incubated to allow viral growth.
Action: Inject viruses into eggs and incubate (Step 1).

Step 4: Open eggs and collect viruses

After incubation, the eggs are opened to harvest the grown viruses.
Action: Open eggs and collect viruses (Step 5).

Step 5: Inactivate or weaken viruses

The collected viruses are inactivated (killed) or weakened (for live attenuated vaccines) to ensure they cannot cause disease but still trigger an immune response.
Action: Inactivate or weaken viruses (Step 3).

Step 6: Combine the 3 viruses to make vaccine

Finally, the processed viruses (from the 3 selected strains) are combined to formulate the vaccine.
Action: Combine the 3 viruses to make vaccine (Step 6).

Answer:

The correct order is: 4 (Collect data on flu strains) → 2 (Select 3 flu strains) → 1 (Inject viruses into eggs and incubate) → 5 (Open eggs and collect viruses) → 3 (Inactivate or weaken viruses) → 6 (Combine the 3 viruses to make vaccine).