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M. catarrhalis can be a commensal organism found in the respiratory tract of young children and infants, and in a small percentage of adults depending on factors such as location, age and health. If symptomatic, it commonly presents as otitis media, or infection of the middle ear, in children and as an upper respiratory infection in adults. Because of widely varying colonization rates throughout studies, more information must be gathered to understand these processes [9] .

Electron micrograph of secreting BRO ß-lactamase after sucrose shock. From:

Since the discovery of a ß-lactamase-positive strain of M. catarrhalis , the resistance of the species to ß-lactam drugs has increased at a rate much greater than other bacterial species. More than 90% of known isolates are ß-lactamase-positive [10] . The origins of this structure are unknown, as it seems to be very unique to the species, existing at two forms: BRO-1 and BRO-2. Unlike other gram negative bacteria, the enzyme is lipidated and membrane associated. It is possible that this might have evolved from a similar enzyme found in gram positive bacteria. The evidence of this is the distinctive G+C content of the BRO region compared to the rest of the genome [11] . BRO-1 expressive strains seem to have a greater antibiotic resistance than BRO-2 strains. This does not result from a difference in enzymatic activity, but from variance in expression Buy Cheap Huge Surprise surf sticker track pants with sleeve detailing Black Ex Infinitas Low Shipping Fee Cheap Price View Sale Amazon xn6arWyH7v

CopB is a surface protein expressed that is believed to be involved in acquisition of iron from host lactoferrin or transferrin molecules. Studies have shown that CopB is expressed much more readily under conditions of low iron and that CopB will bind with human lactoferrin molecules when they are under heavy load [13,14] . Anti-CopB antibodies have been found in blood serum of patients previously infected and have been studied for potential methods of enhancing clearance. Although M. catarrhalis is strictly a human pathogen and results are therefore inconclusive, animal models have shown increased clearance in CopB knockout infection of rats [15] .

The function of OMP CD is not very well understood. It shares some characteristics with the OprF porin Pueudomonas, however its exact function has not been proven. Like CopB, studies have been conducted to examine it as a potential basis for vaccines. Again, the certainty of animal models is uncertain, but mice that have been immunized with CD have shown much better bacterial clearance rates than controls [16] .

uspA1 and uspA2 is a dimeric protein associated with cell adherence to human epithelial cells. It has been shown that isolates of the protein have a high affinity to extracellular fibronectin, a component of integrands, and vitronectin [17] . It has also been observed that uspA2 gives a certain degree of resistance to the bactericidal qualities of blood serum. Knockout strains, again in mice, were extremely sensitive to the toxicity of human serum, whereas uspA1 and wild type strains were unaffected [18] . These proteins are also excellent candidates for possible vaccination due to their homogeneity amongst virulent strains, and because of the immune response that they illicit. Again, mice models have shown better clearance rates in those immunized with uspA1 or uspA2 [19] .


Bacteria are any of a very large group of single-celled microorganisms that display a wide range of metabolic types, geometric shapes and environmental habitats—and niches—of occurrence. Normally only several micrometers in length, bacteria assume the form ofspheres, rods, spirals and other shapes. Bacteria are found in a very broad gamut of habitats; for example, bacterial extremophiles that thrive in such places as hot springs, arctic environments, radioactive waste, deep sea oil seeps, deep Earth crustal environments, hypersaline ponds and within other living organisms. There are approximately 50 million bacterial organisms in a single gram of typical surface soil. The worldwide bacterial biomass exceeds that of all plants and animals on Earth. However, the majority of bacteria have not yet been characterised.

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Bacteria are members of the prokaryote group. In contrast to eukaryote cells, bacteria lack a cell nucleus and customarily have no organelles. The bacteria domain can be grouped into two major categories: (a) Eubacteria and (b) Cyanobacteria. The latter group has historically been termed blue-green algae, but modern cladistics classifies these as bacteria. Presently the bacteria are considered composed of five discrete clades, or unique phylogenetic trees, each having a unique common ancestor. While there are a number of recognized phyla, the dominant ones are Proteobacteria, Firmicutes, Actinobacteria....

This major phylum incorporates a gamut of pathogens, such as Escherichia, Salmonella, Vibrio, Helicobacter , and numerous other genera. Some other proteobacteria are free-living, and include many of the species responsible for fixing nitrogen. Many move about using flagellae, but some are non-motile or rely on bacterial gliding. The latter include myxobacteria, a unique group of bacteria that can aggregate to form multicellular fruiting bodies.

A wide variety of metabolic types reside within proteobacteria. Most species are facultatively or obligately anaerobic, chemoautotrophs, and heterotrophic, but there are many exceptions. Numerous genera, which are not closely related to each other, convert energy from light through photosynthesis. These are termed purple, in reference to their generally reddish pigmentation.


This gram positive phylum has widespread occurrence in soils, freshwater and marine ecosystems. Many of the species in the phylum are key decomposers of organic detritus, and thus have an important role in the carbon cycle. Some of the species of Actinobacteria are pathogens and inhabit plant or animal hosts. Most of the phylum are aerobic species, but some are capable of metabolizing in oxygen-deprived environments. This phylum often exhibits a filamentous branched structure as in the case of Actinomyces israelii . The organism believed to be the oldest living creature is a species within the Actinobacteria found in Siberia, that is thought to date to about 500,000 years before present.

There is no vaccine to protect the population from Chlamydia infections. At this time there are laboratories, such as Rocky Mountain Laboratories (RML), who are actively working to develop a vaccine against C. trachomatis . Dr. Harlan Caldwell of RML and his research group are actively testing a vaccine that can protect against all 15 Chlamydia varieties. His group’s studies have shown that the vaccine can prevent lab cells from becoming infected. They are currently testing it in animals (6). Until a vaccine is developed though, abstinence, sexual education/prevention programs, and timely and proper screening for and treatment for Chlamydia are the only recourse in controlling this infection.


1. Center for Disease Control. STD Surveillance 2006. Available from: . Accessed February 9, 2008.

2. Center for Disease Control. STD Treatment Guidelines 2006. Available from: . Accessed February 9, 2008.

3. Center for Disease Control. Chlamydia-CDC Fact Sheet. Available from: . Accessed February 9, 2008.

4. Diagnostic Automation, Inc. Chlamydia IgG ELISA. Available from: . Accessed February 16, 2008.

5. The Merck Manual of Diagnosis and Therapy . 16 th ed. Merck Research Laboratories. Rahway, N.J. 1992.

6. Pekoc K. RML Vaccine Concept Awarded for Innovation. NIH News. June 11, 2007. Available from: . Accessed February 7, 2008.

7. Quest Diagnostics. December 2007. Prevention of Pelvic Inflammatory Disease (PID) - Screening for Chlamydia trachomatis and Neisseria gonorrheae . Available from: Accessed February 11, 2008.

8. TJ Clark Co. Chlamydia Trachomatis. Available from: Accessed February 11, 2008.

9. The World Health Organization. Chlamydia Trachomatis. Available from: . Accessed February 25, 2008.

10. The World Health Organization. Sexually Transmitted Infections. Available from: . Accessed February 25, 2008.

Pharmacokinetics and pharmacodynamic . Pharmacokinetics is the study of the absorption, distribution, metabolism, and elimination of a drug from the body. Pharmacodynamics is the study of the relationship between drug concentration (in serum or tissue) and the anticipated pharmacological effects (e.g., bacterial killing) at the site of activity. MICs for a particular pathogen may be misleading if they are used as the sole criterion for selecting an antimicrobial agent, because the MIC of a given antimicrobial provides only partial insight into its potency [ 60–64 ].

Pharmacokinetics and pharmacodynamic

The β-lactams (i.e., penicillins, cephalosporins, and carbapenems), the macrolides, and clindamycin display time-dependent kill rates. Thus, the length of time that the serum concentration of the antimicrobial drug exceeds the MIC value (i.e., time µ MIC) is related to bacterial cure rates. In general, if the antimicrobial serum concentration is higher than the MIC for at least 40% or 50% of the dosing interval for penicillins and cephalosporins, respectively, bacteriologic cure rates will be high [ 62 , 63 ]. A study of mortality associated with S. pneumoniae infection in animal models has shown that the survival rate was nearly 0% when serum levels exceeded the MIC for <20% of the dosing interval but was 90%–100% when serum concentrations were higher than the MIC value for ⩾40%–50% of the dosing interval [ 63 ]. Studies of children with acute otitis media [ 65 ] and adults with pneumococcal pneumonia have replicated these findings. Most oral β-lactams, with the exception of amoxicillin and, perhaps, cefuroxime, cannot be used to treat acute otitis media caused by penicillin-nonsusceptible S. pneumoniae , because the length of time that the drug concentration is higher than the MIC is too short [ 66 ].

The aminoglycosides and quinolones display concentration-dependent pharmacokinetic and pharmacodynamic mechanisms, meaning that higher serum concentrations correlate with higher bacterial kill rates. Thus, the key parameter used to predict clinical and bacterial eradication with these antimicrobials is the ratio of the 24-h area under the concentration-time curve (AUC) to the MIC (AUC/MIC ratio, sometimes called “area under the inhibitory curve,” or AUIC) [ 63 ]. The AUC and thereby the AUC/MIC ratio may be calculated for total drug or free drug. Although most studies have reported total-drug ratios, the free-drug AUC/MIC ratio may be more important. For example, when quinolones were tested, mortality rates among immunocompromised animals were high (µ50%) when the AUC/MIC ratio (or AUIC) was <30, and mortality rates were nearly 0% when the AUC/MIC ratio exceeded 100. AUC/MIC ratios of ⩾100–125 have been predictive of satisfactory clinical outcome in immunocompromised patients who are receiving intravenous quinolones for serious bacterial infections [ 61 , 63 , 64 ]. In animals with intact immune systems, a free-drug AUC/MIC ratio of 25 may be adequate. At present, there is no real consensus on the ideal target free-drug AUC/MIC ratio for most patients, but data suggest that, for S. pneumoniae , a ratio of at least 25–30 and perhaps as high as 55 is necessary ( table 5 ) [ 63 , 67 ].

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