Where is Moraxella found in the body?
Moraxella organisms are Gram-negative cocci in the family Neisseriaceae. They were previously known as diplococcus of Morax-Axenfeld. Moraxellae are normal inhabitants of the upper respiratory tract and are also found on the skin and in the urogenital tract.
Does Moraxella grow on MacConkey Agar?
They grow well on blood agar as well as chocolate agar but not on MacConkey agar.
Is Moraxella catarrhalis hemolysis?
Moraxella catarrhalis is an oxidase-positive, catalase-positive, gram-negative diplococci that exhibits γ-hemolysis (no hemolysis) when grown on blood agar plates (Figure 2-5).
Where is Moraxella Osloensis?
Moraxella osloensis is part of normal flora in the skin, mucus membranes and respiratory tract of humans. Infection with this organism is rare, and few cases in literature were reported.
How do you catch Moraxella?
Moraxella catarrhalis is a bacterium that causes infection by sticking to a host cell. It does this using special proteins called adhesins that are on its outer membrane. Doctors usually treat M. catarrhalis infections with antibiotics, but this is becoming increasingly challenging due to antibiotic resistance.
What antibiotics cover Moraxella catarrhalis?
Amoxicillin-clavulanate, second- and third-generation oral cephalosporins, and trimethoprim-sulfamethoxazole (TMP-SMZ) are the most recommended agents. Alternatively, azithromycin or clarithromycin can be used. More than 90% of M catarrhalis strains have been shown to resist amoxicillin, and these rates vary by region.
Is Moraxella aerobic or anaerobic?
Moraxella catarrhalis is an obligately aerobic Gram-negative bacterium that colonizes the human upper respiratory tract.
How can you tell the difference between Neisseria and Moraxella?
The key difference between Neisseria and Moraxella is that Neisseria is a genus that belongs to the class of beta proteobacteria while Moraxella is a genus that belongs to the class of gamma proteobacteria. Proteobacteria is a major phylum comprised of gram-negative bacteria.
Does Moraxella ferment glucose?
M. catarrhalis typically is oxidase positive and fails to ferment glucose, maltose, sucrose and lactose.
Is Moraxella catarrhalis an STD?
Moraxella catarrhalis – Gonorrhea – STD Information from CDC.
Can Moraxella cause UTI?
Recurrent urinary tract infection with haematuria caused by Moraxella (Branhamella) catarrhalis. J Infect.
Does doxycycline treat Moraxella?
Doxycycline has a high degree of activity against many common respiratory pathogens including S pneumoniae, Haemophilus influenzae, Moraxella catarrhalis, anaerobes such as Bacteroides and anaerobic/microaerophilic streptococci and atypical agents like Legionella, Mycoplasma pneumoniae, and Chlamydia pneumoniae.
What causes Moraxella Osloensis?
The genus Moraxella consists of aerobic, oxidase-positive, and Gram-negative coccobacilli. Moraxella osloensis has been isolated from environmental sources in hospitals and from the normal human respiratory tract,1 and has been reported as a rare causative pathogen of infections in humans.
Is Moraxella Osloensis pathogenic?
osloensis alone is pathogenic to D. reticulatum after injection into the shell cavity or hemocoel of the slug. The bacteria from 60-h cultures were more pathogenic than the bacteria from 40-h cultures, as indicated by the higher and more rapid mortality of the slugs injected with the former.
Can Moraxella cause meningitis?
A number of common childhood illnesses, including some middle ear (otitis media) and sinus infections (sinusitis), are caused by Moraxella catarrhalis bacteria. On rare occasions, this same organism may cause a blood infection (bacteremia), an eye infection (conjunctivitis), and meningitis in newborns.
How long does Moraxella last?
Although bacteremia. It can occur spontaneously, during certain tissue infections, with use of indwelling genitourinary or IV catheters, or after dental… read more is rare, half of patients die within 3 months because of intercurrent diseases.
Do you need antibiotics for Moraxella catarrhalis?
Infections caused by M. catarrhalis usually respond well to antibiotics. However, almost all strains of M. catarrhalis produce an enzyme called beta-lactamase, which makes them resistant to some common antibiotics, such as penicillin and ampicillin.
Is there a vaccine for Moraxella catarrhalis?
Moraxella catarrhalis is a prominent pathogen that causes acute otitis media in children and lower respiratory tract infections in adults, resulting in a significant socioeconomic burden on healthcare systems globally. No vaccine is currently available for M. catarrhalis.
Does Moraxella catarrhalis cause pneumonia?
M catarrhalis causes bronchitis and pneumonia in children and adults with underlying chronic lung disease and is occasionally a cause of bacteremia and meningitis, especially in immunocompromised persons. Bacteremia can be complicated by local infections, such as osteomyelitis or septic arthritis.
How is Moraxella catarrhalis transmitted?
Transmission is believed to be due to direct contact with contaminated secretions by droplets. The endotoxin of M catarrhalis, a lipopolysaccharide similar to those found in Neisseria species, may play a role in the disease process.
How common is Moraxella catarrhalis?
Moraxella catarrhalis is an exclusively human pathogen and is a common cause of otitis media in infants and children, causing 15%-20% of acute otitis media episodes. M. catarrhalis causes an estimated 2–4 million exacerbations of chronic obstructive pulmonary disease in adults annually in the United States.
Is Moraxella encapsulated?
Moraxella species are gram negative, non-motile diploccocci and may be encapsulated.
Does Moraxella catarrhalis have endospores?
Moraxella catarrhalis is also non-motile, non-spore forming, aerobic, which means it needs oxygen to survive, and oxidase positive, which means it produces an enzyme called oxidase.
What is Moraxella catarrhalis beta lactamase positive?
Beta-lactamases produced by the M. catarrhalis not only protect the pathogen but also inactivate penicillin, an antibiotic that is commonly used for the treatment of mixed infections caused by other airway pathogens such as Streptococcus pneumoniae and/or nontypeable Haemophilus influenzae [1, 4].
What is the most appropriate antibiotic therapy for meningococcemia?
Cefotaxime (Claforan) Cefotaxime is used as a first-line antibiotic for the empiric therapy of meningitis or sepsis while culture and susceptibility data are pending. Cefotaxime or ceftriaxone are the preferred agents for the treatment of confirmed meningococcal disease.
Is Neisseria catalase positive?
Neisseria species are gram-negative, oxidase-positive bacteria. All are catalase positive, except some strains of N. bacilliformis and N. elongata.
Is Neisseria a cocci?
Neisseria species are Gram-negative cocci, 0.6 to 1.0 μm in diameter. The organisms are usually seen in pairs with the adjacent sides flattened. Pili, hairlike filamentous appendages extend several micrometers from the cell surface and have a role in adherence.
Are Staphylococcus gram-positive or negative?
Staphylococcus aureus is a gram-positive bacteria that cause a wide variety of clinical diseases. Infections caused by this pathogen are common both in community-acquired and hospital-acquired settings.
Does vancomycin cover Moraxella?
Moraxella catarrhalis is resistant to penicillin, ampicillin, amoxicillin, vancomycin, and clindamycin but susceptible to amoxicillin-clavulanate, expanded-spectrum or broad-spectrum cephalosporins, tetracyclines, rifampin, and erythromycin(3,4,7).
Is diplococci gram-negative?
Examples of gram-negative diplococci are Neisseria spp. and Moraxella catarrhalis. Examples of gram-positive diplococci are Streptococcus pneumoniae and Enterococcus spp.
How do you test for Moraxella catarrhalis?
Confirmation of the diagnosis of M catarrhalis infection is based on isolation of the organism in culture. Cultures can be taken from middle ear effusion, the nasopharynx, sputum, sinus aspirates, transtracheal or transbronchial aspirates, blood, peritoneal fluid, wounds, or urine.
Is Moraxella DNA positive?
Moraxella spp. are Gram-negative diplococci that morphologically and phenotypically resemble Neisseria spp. They are strictly aerobic, oxidase-positive, catalase-positive, DNAse-positive and asaccharolytic.
Where does Moraxella catarrhalis live?
Moraxella catarrhalis is an exclusively human commensal and mucosal pathogen. It is a common commensal organism of the upper respiratory tract, particularly in children; however, it is increasingly being recognised as a pathological organism causing otitis media, sinusitis, ocular infection and occasionally laryngitis.
What is Moraxella pneumonia?
Moraxella catarrhalis is a gram-negative diplococcus that commonly colonizes the upper respiratory tract. It is a leading cause of otitis media in children, acute exacerbations of chronic obstructive pulmonary disease (COPD), and acute bacterial rhinosinusitis.
What are the symptoms of streptococcus pneumoniae?
Symptoms can include fever, cough, shortness of breath, chest pain, stiff neck, confusion, increased sensitivity to light, joint pain, chills, ear pain, sleeplessness, and irritability. In severe cases, pneumococcal disease can cause hearing loss, brain damage, and death.
Which of the following are sources of exogenous infection?
Infections caused by exogenous bacteria occurs when microbes that are noncommensal enter a host. These microbes can enter a host via inhalation of aerosolized bacteria, ingestion of contaminated or ill-prepared foods, sexual activity, or the direct contact of a wound with the bacteria.
Is doxycycline a strong antibiotic?
Is doxycycline a strong antibiotic? Doxycycline is an antibiotic that is frequently used for hard-to-treat infections or those that are resistant to other drugs. It works somewhat differently than other antibiotics, and its potency is determined by dosage and course of treatment.
What does doxycycline do to bacteria?
Doxycycline is in a class of medications called tetracycline antibiotics. It works to treat infections by preventing the growth and spread of bacteria. It works to treat acne by killing the bacteria that infects pores and decreasing a certain natural oily substance that causes acne.
How long does it take for doxycycline to work for bacterial infection?
Response and effectiveness. Doxycycline is almost completely absorbed after oral administration. Peak concentrations are reached within two to three hours after dosing; however, it may take up to 48 hours before infection-related symptoms start to abate.
Is Moraxella an Enterobacteriaceae?