Legionnaires’ Disease

Appealing to background knowledge once more, it seemed that a bacterium would be the most likely source of an airborne disease with the symptoms of Legionnaires’ disease. But researchers had already made a rou- tine check for bacteria that cause pneumonia-like diseases, and they had found none. For this reason, attention was directed to the possibility that some previously unknown organism had been responsible but had some- how escaped detection.

It turned out that an undetected and previously unknown bacterium had caused the illness, but it took more than four months to find this out. The difficulties encountered in this effort show another important fact about the reliance on a background assumption: Sometimes it turns out to be false. To simplify, the standard way to test for the presence of bacteria is to try to grow them in culture dishes—flat dishes containing nutrients that bacteria can live on. If, after a reasonable number of tries, a colony of a particular kind of bacterium does not appear, then it is concluded that the bacterium is not present. As it turned out, the bacterium that caused Legionnaires’ disease would not grow in the cultures commonly used to detect the presence of bacteria. Thus, an important background assumption turned out to be false.

Don't use plagiarized sources. Get Your Custom Essay on
Legionnaires’ Disease
Just from $13/Page
Order Essay

After a great deal of work, a suspicious bacterium was detected using a live-tissue culture rather than the standard synthetic culture. The task, then, was to show that this particular bacterium in fact caused the disease. Again to simplify, when people are infected by a particular organism, they often develop antibodies that are specifically aimed at this organism. In the case of Legionnaires’ disease, these antibodies were easier to detect than the bacterium itself. They also remained in the patients’ bodies after the infection had run its course. We thus have another chance to apply the NCT: If Legionnaires’ disease was caused by this particular bacterium, then whenever the disease was present, this antibody should be present as well. The suspicious bacterium passed this test with flying colors and was named, appropriately enough, Legionella pneumophila. Because the investi- gators had worked so hard to test such a wide variety of candidates, they assumed that the disease must have some cause among the candidates that they checked. So, since only one candidate remained, they felt justified in reaching a positive conclusion that the bacterium was a necessary condi- tion of Legionnaires’ disease.

Academic Heros
Calculate your paper price
Pages (550 words)
Approximate price: -

Why Work with Us

Top Quality and Well-Researched Papers

Our writers are encouraged to read and research widely to have rich information before writing clients’ papers. Therefore, be it high school or PhD level paper, it will always be a well-researched work handled by experts.

Professional and Experienced Academic Writers

For one to become part of our team, thorough interview and vetting is undertaken to make sure their academic level and experience are beyond reproach, hence enabling us give our clients top quality work.

Free Unlimited Revisions

Once you have received your paper and feel that some issues have been missed, just request for revision and it will be done. In addition, you can present your work to the tutor and he/she asks for improvement/changes, we are always ready to assist.

Prompt Delivery and 100% Money-Back-Guarantee

All our papers are sent to the clients before the deadline to allow them time to review the work before presenting to the tutor. If for some reason we feel our writers cannot meet the deadline, we will contact you to ask for more time. If this is not possible, then the paid amount will be refunded.

Original & Confidential

Our writers have been trained to ensure work produced is free of plagiarism. Software to check originality are also applied. Our clients’ information is highly guarded from third parties to ensure confidentiality is maintained.

24/7 Customer Support

Our support team is available 24 hours, 7 days a week. You can reach the team via live chat, email or phone call. You can always get in touch whenever you need any assistance.

Try it now!

Calculate the price of your order

Total price:

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

You have had a hectic day, and still need to complete your assignment, yet it is late at night. No need to panic. Place your order with us, retire to bed, and once you wake up, the paper will be ready.


Essay Writing Service

It does not matter the urgency of your paper, or the academic level, our team is ready to help you 24/7. Just contact us and all your academic needs will be sorted.


Admission Essays & Business Writing Help

A student is often required to write an admission letter requesting to be admitted in a certain institution. For you to be gain that admission in your dream institution, you must write a convincing letter. You can depend on our team for the best admission letters.


Editing Support

Academic writing is not just about getting information and throwing it all over. Our team will ensure you have a polished paper that is coherent and has a good flow of information. We also ensure the paper follows the correct formatting styles like APA, Harvard, MLA, Chicago/Turabian.


Revision Support

If our writers write a paper but you are not satisfied in one way or another, you can always ask for revision. This is totally free. Our writers and editors will revise your paper untill you are be totally satisfied. We as well offer revision for papers not done by our writers at a small fee.