What does Streptococcus viridans cause?

Viridans streptococci, a diverse group of streptococcal species, are important causes of sepsis and pneumonia in the neutropenic host and sepsis and meningitis in the neonate. The oral mucosa is the most common portal of entry.

What antibiotic kills Streptococcus viridans?

Patients with viridans group streptococcal endocarditis receive parenteral therapy with either penicillin G or ceftriaxone with or without an aminoglycoside, or with vancomycin administered alone (8).

How do you know if you have Streptococcus viridans?

Identification. Viridans streptococci can be differentiated from Streptococcus pneumoniae using an optochin test, as viridans streptococci are optochin-resistant; they also lack either the polysaccharide-based capsule typical of S. pneumoniae or the Lancefield antigens of the pyogenic members of the genus.

Is Viridans streptococci serious?

Viridans Streptococci The most serious Viridans infections occur when the bacteria enters other regions of the body. For example, if Viridans gets into the bloodstream it can cause endocarditis (infection of the inner lining of the heart).

How does Streptococcus enter the body?

These bacteria are spread by direct contact with nose and throat discharges of an infected individual or with infected skin lesions. The risk of spread is greatest when an individual is ill, such as when people have strep throat or an infected wound.

What antibiotics treat endocarditis?

Initial empiric therapy in patients with suspected endocarditis should include vancomycin or ampicillin/sulbactam (Unasyn) plus an aminoglycoside (plus rifampin in patients with prosthetic valves). Valve replacement should be considered in selected patients with infectious endocarditis.

How do you identify streptococcus bacteria?

Streptococci are non-motile, microaerophilic, Grampositive spherical bacteria (cocci). They often occur as chains or pairs and are facultative or strict anaerobes. Streptococci give a negative catalase test, while staphylococci are catalase-positive.

Does strep Viridans live on skin?

The viridans streptococci are most prevalent in the oral cavity but also reside in the upper respiratory tract, the female genital tract, and all regions of the gastrointestinal tract; they also are occasionally found as part of the skin flora.

What kind of disease does viridans streptococci cause?

Viridans Streptococci. Viridans Streptococci are a grouping of multiple Streptococcal species which do not possess Lancefield antigens, are alpha-hemolytic, and result in infective endocarditis.

How can you tell if you have strep viridans?

Another test that can be used to distinguish Strep viridans from Strep pneumoniae is the bile solubility test, which can be done in a test tube, or more commonly, by dripping drops of bile on bacterial colonies.

Is the viridans bacteria a by-product of alpha hemolysis?

Lack of alpha hemolysis does not seem to correlate with the clinical outcome or severity of disease; no enzymatic or toxigenic effect has ever been documented as a by-product of alpha hemolysis. Under the microscope, bacteria from the viridans group are gram-positive cocci in chains.

What makes Streptococcus anginosus a Gram positive bacteria?

However, in the Streptococcus anginosus group, some species can be assigned to Lancefield groups A, C, F or G. Now, viridans streptococci have a thick peptidoglycan cell wall, which takes in purple dye when Gram stained – so they’re gram-positive bacteria. They’re also catalase negative – which means they don’t produce an enzyme called catalase.