Taking a Look at N. Meningitidis

Meningococcal disease is a disease that can be found worldwide. Meningococcal disease refers to any disease or illness that is caused by the type of bacteria called Neisseria meningitides, also called meningococcus (Meningococcal disease, 2015). The first documented outbreak was over two hundred years ago in Geneva in 1805 which circulated rapidly and killed thirty three people. The first case ever recorded in America was in 1806 in Medford, Massachusetts (Fredericks, n.d.). A European physician, Professor A Weichselbaum, discovered the cause of the mysterious cerebro-spinal meningitis illness in 1887 and Penicillin was the first antibiotic used to fight the disease. In 1978 the first

Bacteria are ubiquitous; they can be found on the skin, in the soil, and inside the body. Because of the very nature of this ubiquity, it is important to be able to determine between different strains of bacteria. An example of this is determining the causative agent for a disease so that the patient will be treated with the appropriate antibiotics. It may be important to determine the bacteria in a certain region, because like with enteric bacteria, it is normal to find them in the digestive tract as they are in a symbiotic relationship with our bodies in this area; however, they also cause opportunistic infections in places outside of the digestive tract to our detriment, such as with a urinary tract infection. Some strains of bacteria are common to nosocomial infections, and identifying these bacteria as such helps create the guidelines for healthcare workers in antiseptic technique. All of the morphology and characteristics of each strain of bacteria help us to better understand the role of bacteria in the body as well as helps us understand how they can cause illness, and what treatment regimen to set in place. In lab this semester, a sample of unknown

Neisseria meningitidis is a fastidious, aerobic, and encapsulated gram-negative diplococcus which infects humans via droplet transmission to and from mucosal surfaces in the nasopharyngeal region. Only humans can be infected with N. meningitidis and the disease manifests in children under two years of age and in young adults. N. meningitidis can be found as normal regional flora of the nasopharynx in some individuals, but when it causes infection leads to meningitis and occasionally septicaemia. The major symptoms of N. meningitidis infection include a stiff neck, high fever, photophobia, confusion, cephalgia and emesis. If the patient’s condition has worsened causing sepsis, they can present with a haemorrhagic rash which is indicative of

Naegleria fowleri infection is a deadly disease caused by a form of protist typically found dwelling within warm bodies of fresh water, such as lakes, rivers, streams and unchlorinated swimming pools. It can also be found within soil or in warm fresh water deposits outside of factories. Naegleria fowleria typically reside within fish or other water-dwelling organisms, but they have been known to infiltrate the human body via the nasal cavity.

that is responsible for this disease. It is usually seen in pairs with neighboring sides flattened.

Phylogenetic trees are a useful tool in looking at individuals (Hill et al. 2016). Knowing this, we can look at the evolutionary history of that particular bacteria, and discover how it has evolved. Phylogeny can trace closely related bacterial species to Neisseria gonorrhoeae. From this, we can discover characteristics that have been derived in gonorrhea that differ from the common ancestor of the bacterial species. N. menigitidis and N. lactamica are the closely the evolutionary history of diseases. The bacteria Neisseria gonorrhoeae was primarily found within infected related bacterial species to N. gonorrhoeae (Bennett 2007). Each pathogen is known to effect humans. Since N. gonorrhoeae have uniformity, the closely related species help to sort out and identify these strains using multilocus sequence typing (Bennett 2007). The uniformity in the strains of gonorrhea suggest they have a fitness that is

Whenever there is an unknown disease caused by microorganisms, tests are usually made in order to identify the organism causing the disease. There are several tests that need to be made and they include tests such as performing a gram stain, streaking a plate to isolate colonies, inoculating a broth culture, inoculating API strip, and performing oxidase and catalase tests. Having knowledge on how to identify these tests are of high importance in the medical field so it would be to the advantage of those individuals who know how to examine microorganisms and be able to identify it by correctly performing tests on organisms.

Meningitis can be destructive without proper understanding of what it is caused by. There are three types of meningitis- bacterial, fungal, and viral. Contrasting factors tend to arise during a comparison of them. One of the most notable areas that viral, fungal and bacterial meningitis differ in are their treatment ability. However, they have the same general affects on the human body. In any case, there are tests that doctors can utilize in order to discover if the meningitis is bacterial, fungal, or viral.

Rouphael N, Stephens S (2015, March 4) Neisseria meningitidis: Biology, Microbiology and Epidemiology Retrieved from

There are thirteen serogroup classifications of Neisseria meningitidis that fall under the genus Neisseria which are closely related to Neisseria gonorrhoeae. Of the thirteen serogroups - A, B, C, D, 29E, H, I K, L, W-135, X, Y, and Z only three genetic strains have been sequenced: Z2491 from serogroup A, MC58 from serogroup B and FAM18 from serogroup C and all three of those strains contain a single circular chromosome that has a GC pair content of 51%. Several strains of this bacteria contain pili which enhances their pathogenicity giving them the purpose to adhere to surfaces, move, and transform their genetics. N. meningitidis are aerobic bacteria containing high catalase and oxidase activity. The reason for a high catalase allows them to compensate for oxidative damage in a low-pressure oxygen environment for their lack of a superoxide dismutase enzyme. Neisseria meningitidis is characterized as a parasitic, aerobic, gram-negative diplococcus that is non-endospore with a niche in the human nasopharyngeal. Its genetics consists of a surface polysaccharide capsule. In addition, their morphological colonies tend to appear smooth, moist and gleaming. The bacterium can produce gamma-glutamylamino-peptidase and typically grow on plates with

5. Describe in detail the mode of action of this antibiotic and how it would be effective in treating the microbe causing bacterial meningitis. The mode of action would be to treat for 3 to 7 days of intravenous or intramuscular with penicillin or ceftriaxone. This can also be treated with other antibiotics such as chloramphenicol, meropenem and fluoroquinolones. A person is still infectious as long as menigococci is present in oral or respiratory secretions or if they have been on effective antibiotic treatments for 24

N. meningitides bacterium responsible for outbreaks in densely populated areas such as childcare centers, boarding schools, or college living areas (Smeltzer, Bare, Hinkle, & Cheever, 2010). These outbreaks are most common in winter and spring months when risk factors like upper respiratory infections are more likely (Smeltzer, Bare, Hinkle, & Cheever, 2010). Immunosuppression must be present for this pathogen to invade. Other risk factors for meningitis are otitis media (middle ear infection), mastoiditis (mastoid bone infection) (Smeltzer, Bare, Hinkle, & Cheever, 2010), systemic sepsis, sinusitis (sinus infection), basilar skull fractures, and the very young and the very old (Porth & Matfin, 2009).

Meningococcal Meningitis is a dangerous bacterial infection that has taken the lives of many people since it has been discovered. This particular form of meningitis can be detected by symptoms that someone experiences and can also sometimes be treated. There are now methods of prevention in order to try to avoid outbreaks from occurring. This blood borne pathogen is extremely dangerous and can greatly damage someone’s life.

In 1906 it was first discovered that horses were a viable source to make antibodies that could be used against the meningococcal bacteria. This was then further looked into and made more progress by an American scientist by the name of Simon Flexner. Flexner’s further development of the antibodies from the horses aided in the attempt to lower the mortality rate from the meningococcal disease. (1) The first reported case of using penicillin against meningitis and effectively working was not until over forty years later. Georg Joachmann, in Germany, and Flexner, in America, were the firsts to successfully treat meningitis with introduction of the serum therapy for meningococcal meningitis.

Meningococcal disease is a large concern in the medical field because it is unbiased towards the patients it infects. There has been limited success in trying to eliminate this disease. Antibiotics play a role in helping to treat patients with bacterial meningitis, and steroids have been tested to help reduce risk factors. Prevention has also become a key issue because meningitis can only be spread through direct contact with infected body fluid. The best prevention is to maintain clean hygiene. Vaccines are another way of preventing disease. However, there are multiple serogroups of meningitis that makes creating a universal vaccine extremely difficult. So far, there have only been two