Urease Operon and Urease Activity in Commensal and Disease-Causing Nontypeable Haemophilus influenzae
نویسندگان
چکیده
منابع مشابه
Invasive Disease Caused by Nontypeable Haemophilus influenzae.
such as sepsis and meningitis, has declined substantially since the introduction of the H. influenzae serotype b vaccine. However, the H. influenzae type b vaccine fails to protect against nontypeable H. influenzae strains, which have become increasingly frequent causes of invasive disease, especially among children and the elderly. We summarize recent literature supporting the emergence of inv...
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Nontypeable Haemophilus influenzae (NTHI) are Gram-negative bacteria that colonize the human pharynx and can cause respiratory tract infections, such as acute otitis media (AOM). Since NTHI require iron from their hosts for aerobic growth, the heme acquisition genes may play a significant role in avoiding host nutritional immunity and determining virulence. Therefore, we employed a hybridizatio...
متن کاملNontypeable Haemophilus influenzae: pathogenesis and prevention.
In this paper, we describe the ability of nontypeable Haemophilus influenzae (NTHi) to coexist with the human host and the devastating results associated with disruption of the delicate state of balanced pathogenesis, resulting in both acute and chronic respiratory tract infections. It has been seen that the strains of NTHi causing disease show a marked genetic and phenotypic diversity but that...
متن کاملNontypeable Haemophilus influenzae and childhood pneumonia.
Nontypeable Haemophilus influenzae (NTHi) is a common microbe frequently isolated from the nasopharynx of children. Bacterial pneumonia is a major cause of morbidity and mortality in children less than 5 years of age, with the burden of disease being greatest in developing countries. Determination of the bacterial aetiology of pneumonia is difficult due to sampling constraints. However, with a ...
متن کاملNontypeable Haemophilus influenzae in carriage and disease: a difference in IgA1 protease activity levels.
CONTEXT Nontypeable Haemophilus influenzae strains form part of the normal flora of the human upper respiratory tract but are also implicated in a wide range of diseases. Infections caused by nontypeable H influenzae are major health and socioeconomic burdens. No single bacterial trait has been associated with disease as opposed to colonization. OBJECTIVES To compare IgA1 protease activity in...
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ژورنال
عنوان ژورنال: Journal of Clinical Microbiology
سال: 2012
ISSN: 0095-1137
DOI: 10.1128/jcm.03145-12