I/GCSE Biology - Vaccination

In I/GCSE Biology, it's important to memorize the topic of vaccination! Let's get started! 😆

VACCINATION :

• involves exposing the body’s immune system to a weakened or harmless version of the pathogen in order to stimulate white blood cells to produce antibodies.
• If the body is re-infected by the same microorganism, memory cells produce antibodies quickly so that the microorganism is destroyed before damage is done. This is how vaccination works:
• In I/GCSE Biology, you should know how vaccination works!!!!

Let's look at an example of covid-19 to show how vaccination helps us!!!!

A safe form of the diseases ➡️ cause microorganism is injected into the body

Although the microorganism is safe, the antigens on its surface still cause the white blood cells to produce specific antibodies

Long after the vaccination, memory cells patrol the body. If the disease-causing microorganism infects the body again, the white blood cells can attack it very quickly.

• In order to prevent an EPIDEMIC of a disease in a population it is important that as many as individuals as possible are vaccinated!
• If more than 95% of the population is vaccinated then the unvaccinated will be protected too because the risk of coming in contact with an infected person will be very small.

In I/GCSE Biology, you should study the following points as well!

There is no guarantee that all vaccines and drugs (medicines) are risk free. People have GENETIC DIFFERENCES, so they may react to a vaccine or a drug in different ways – these are called SIDE EFFECTS.

ANTIMICROBIALS are chemicals that kill, or inhibit bacteria, fungi and viruses. ANTIBIOTICS are a type of antimicrobial that are only effective against bacteria but NOT viruses

Do you remember the principal of natural selection in I/GCSE Biology?

• Over a period of time, bacteria can become RESISTANT to antimicrobials.
• MUTATIONS (random changes) can take place in the genes of microorganisms.
• This leads to new strains of bacteria and fungi that are no longer affected by the antimicrobial.
• These reproduce and pass on the resistance – as a result, the antimicrobial is no longer effective.

• Doctors should only prescribe them when completely necessary
• Patients should always complete a course of antibiotics, even if they are feeling better.

And we're done with this topic! Well Done!

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Drafted by Alyssa (Biology)

References：

1.  "Injection of vaccine", https://thearabweekly.com/sites/default/files/styles/article_image_800x450_/public/2021-01/81-292.jpg?itok=oizNbGAv
2. "Moderna: Covid vaccine shows nearly 95% protection", https://ichef.bbci.co.uk/news/1024/cpsprodpb/185BB/production/_115517799_covid19_how_vaccines_work_v4-nc-2x.png
3. "Proteins recognising other molecules", https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRfumizrzKU7B_5Abyx2jvkDKutipGmwrnFqDGwtmpQuKCyHUZo-HTjljOJYom-VDQ4wM4&usqp=CAU
4. "Disease Outbreaks". Photo from the internet.
5. Whatcom sees 3 deaths, 76 new COVID cases, https://cf-images.us-east-1.prod.boltdns.net/v1/static/5615998027001/be7f9cf4-32af-437d-b365-ada35e7f5b5b/2d0a3d75-1e47-4acc-a0b6-936663c2fa41/1280x720/match/image.jpg?pubId=5615998020001
6. "To prevent resistance to antimicrobiais increase". Photo from the internet.