50 Matching Annotations
  1. Jun 2017
    1. including the common cold, bronchitis, pneumonia,

      Adenovirus and Sin Nombre Virus can both cause respiratory disease

    2. These integrin proteins signal to the cell to endocytose the cell (receptor-mediated endocytosis), which engulfs the adenovirus in a clathrin-coated vesicle

      Adenovirus and Sin Nombre Virus both use integrin proteins to complete receptor-mediated endocytosis

    1. which progresses to a severe respiratory disease

      Adenovirus and Sin Nombre Virus can both cause respiratory disease

    2. The hantavirus virion first attaches to its target cell, pulmonary endothelial cells, by using the protein αVβ3 integrin as a receptor (Borges). Next, the virion enters the targeted cell via endocytosis (Vaheri).

      Adenovirus and Sin Nombre virus both use integrin proteins to complete receptor-mediated endocytosis

    1. Motile via flagella at 30 °C and below, but usually not at 37 °C,[4] L. monocytogenes can instead move within eukaryotic cells by explosive polymerization of actin filaments (known as comet tails or actin rockets).

      virulence

    1. Seven serotypes of the bacterium have been identified on the basis of capsular polysaccharides. H. influenzae type b is the most important serotype involved in meningitis.

      virulence

  2. May 2017
    1. These capsular polysaccharides protect the meningococci from the action of phagocytic cells and enhance organism’s survival during bloodstream and Central Nervous system invasion.

      virulence

    1. More than 98% of cases of invasive meningococcal disease in the United States are sporadic. In 2008 in the United States, disease caused by serogroup B (32% of cases), serogroup C (32% of cases), and serogroup Y (24% of cases) accounted for most of the endemic disease, causing meningitis in 53% of cases

      prevalence

    2. S. pneumoniae is now the most common etiological agent of bacterial meningitis in the United States and Europe, accounting for 61% of total cases in the United States

      prevalence

    3. it now accounts for only 7% of cases (281, 305).

      current prevalence

    4. Prior to the availability of H. influenzae type b conjugate vaccines in the United States, H. influenzae accounted for 45 to 48% of all cases of bacterial meningitis

      prevalence

    5. Given the better system of searching for active cases, the overall incidence of bacterial meningitis was two to three times that of the previous report (276), although H. influenzae, N. meningitidis, and S. pneumoniae continued to account for the majority of cases (77%).

      prevalence

    1. encapsulated bacterium.

      virulence

    2. hough H. influenzae meningitis is rare in adolescents and adults, rates of meningitis due to Hib are highest in children less than five years of age, with an estimated incidence rate of 31 cases per 100,000

      prevalence of H. influenzae

    1. On the basis of ABCs data, the serogroup distribution in the US in 2007 was serogroup B, 25%; serogroup C, 30%; and serogroup Y, 37%, with 9% caused by serogroup W-135, other serogroups, and nongroupable strains (www.cdc.gov/ncidod/DBMD/abcs/survreports/mening07.pdf).

      prevalence of n. meningitidis

    2. Virulent N. meningitidis strains have a polysaccharide capsule, which allows the organism to cause invasive diseases such as bacteremia and meningitis.

      virulence factor

    1. Viral infections are the most common cause of meningitis, followed by bacterial infections and, rarely, fungal infections.

      causes

    1. Campylobacter jejuni is known to possess a LuxS/ autoinducer-2 (AI-2) mediated system that have been partially characterized over the last decade

      quorum sensing

    1. To initiate infection the organism must penetrate the gastrointestinal mucus, which it does by using its high motility and spiral shape. The bacteria must then adhere to the gut enterocytes and once adhered can then induce diarrhoea by toxin release.

      adherence

    1. In this review, we summarize the current “state of the art” of carbapenem antibiotics and their role in our antimicrobial armamentarium

      mechanism of carbapenems

    1. among Klebsiella pneumoniae isolates ESBL producers increased from 1.5% to 4.0%

      Klebsiella resistance prevalence to carbapenems

    1. Those who are living in long-term care facilities or are currently hospitalized and breathing with mechanical ventilators are at even higher risk of developing a lung infection from Klebsiella.

      risk factor for patient

    1. The growth and appearance of these bacteria were not influenced by pH changes over a pH range of 5.2 to 6.4.

      pH conditions

    1. One mechanism of resistance to vancomycin involves the alteration to the terminal amino acid residues of the NAM/NAG-peptide subunits, under normal conditions, D-alanyl-D-alanine, to which vancomycin binds.

      vancomycin resistance mechanisms

    1. Two mechanisms of bacitracin resistance are understood. One mechanism relies on a protein called a BcrABC transporter which pumps bacitracin out after it has entered the cell. Another mechanism relies on another protein called BacA which provides the active phosphorylated bactoprenol from a different synthetic pathway.

      bacitracin resistance

    1. The majority of GCS and GGS strains demonstrate in vitro susceptibility to penicillins, vancomycin, erythromycin, and cephalosporins (3,30). Antimicrobial tolerance, defined as a minimum bactericidal concentration (MBC) 32 or more times higher than the MIC, among GCS and GGS has been reported for penicillin and other agents (24, 27,29).

      examples of antibiotic susceptibilities and tolerances for group c/g strep

    1. rapid streptococcal antigen test and monospot test were negative

      tests to rule out other possibilities

    2. complaining of sore throat, high fever, and neck swelling

      symptoms caused by group c strep in case study example

  3. Apr 2017
    1. Early and aggressive surgical debridement of the site of infection as well as appropriate antimicrobial therapy is required. Due to the "inoculum effect," penicillin may be less effective in the treatment of necrotizing fasciitis (83). Appropriate antibiotics include nafcillin and clindamycin (7,83).  

      antibiotic treatment for nec fas.

    1. Adjust the pH to 7.5.

      pH

    2. Optimal growth of GAS is seen in 5% CO2; however, GAS will also grow in ambient air albeit a little slow.

      other growing conditions

    3. GAS is considered a multiple amino acid auxotroph requiring nearly all amino acids to be present in its growth media. A Chemically Defined Medium has been developed for GAS containing all of the necessary amino acids for GAS growth

      growth requirements for GAS

    1. TheseresultsindicatethatthehyaluronicacidcapsuleofmucoidGASprotectstheorganismfromphagocytosisandenhancesvirulence.

      HA also part of immune evasion

    2. Mproteinhasbeenconsideredtobethemajorsurfacecomponentrespon-sibleforresistanceofGAStophagocytosis(12)

      immune evasion-virulence factor

    3. OccasionalstrainsofGASisolatedfromclinicalsourcesgrowaslarge,spreading,wetcoloniesonsolidmedia;

      colony morphology

    1. Humans can become infected(https://www.cdc.gov/tularemia/transmission/index.html) through several routes, including:

      mode of transmission

    2. Tularemia is a disease of animals and humans caused by the bacterium Francisella tularensis.
    1. Nature of the exposure
    2. Francisella tularensis is highly infectious when grown in culture, and laboratory-acquired infections have been documented.
    1. Use insect repellents containing 20% to 30% DEET (N,N-diethyl-meta-toluamide), picaridin or IR3535. EPA provides information on the proper use of repellents.

      can ask if working outside/camping/etc without using insect repellent

    1. For this reason, it is important to share with your health care provider any likely exposures, such as tick and deer fly bites, or contact with sick or dead animals. 

      asking about mode of transmission necessary for diagnosing this

    1. It can also occur when other forms of tularemia (e.g. ulceroglandular) are left untreated and the bacteria spread through the bloodstream to the lungs.
    2. This can occur when a person is butchering an infected animal and touches his or her eyes
    3. Also generally acquired through the bite of an infected tick or deer fly or from handling sick or dead animals.