Infectious Disease
Expert guidance on antimicrobial stewardship, emerging infections, and complex infectious disease management.
Recent Discussions
Is there any utility to trending Histoplasma serology titers to guide duration of therapy or treatment response for pulmonary histoplasmosis with negative urine antigen?
Serology unfortunately is not useful to monitor response to therapy as the fall in titers is often very slow. In immunocompetent individuals, titers will often take a few years to show a significant drop in the antibody titer after successful treatment. The treatment duration should be guided by the...
Does a low serofast RPR titer (such as 1:1 or 1:2) in the setting of a remote history of appropriately treated latent syphilis in a patient with now uveitis of yet unknown etiology referred from ophthalmology for possible ocular syphilis make a diagnosis of ocular syphilis less likely?
I err on the side of offering empiric treatment. As syphilis rates have risen over the past 20 years, so has the incidence of syphilitic uveitis (Mir et al., PMID 37991790), and the question posed, therefore, represents a not uncommonly encountered conundrum for infectious disease consultants. Syphi...
Do you prefer vancomycin or daptomycin for gram-positive coverage in culture-negative prosthetic valve endocarditis considering both Corynebacterium and Enterococcus are notable possible pathogens?
In recent years, we have transitioned from using Vancomycin to Daptomycin for the treatment of endocarditis, whether it involves a native or prosthetic valve or culture negative. This shift is primarily due to concerns about intolerance rather than Vancomycin resistance. Additionally, recent literat...
How long would you treat an upper urinary tract infection in a patient with acute obstructive pyelonephritis due to a kidney stone status-post urinary stenting without yet removal of the stone?
After treatment of an ascending urinary tract infection for 7 days, the infection will be treated. However, if the stone is large enough it may be colonized and cause recurrent infection. I would make my best efforts to get the stone removed as soon as possible and I would likely give the patient a ...
Do you recommend starting anti-fungal prophylaxis for patients on systemic antibiotics who have a peritoneal dialysis catheter that is only currently being accessed for once weekly flushes?
This is a unique situation which is for me a strictly hypothetical one, as I've not encountered this situation in my 38-year PD career. Nor am I aware of data to guide a response. On reflection, however, I would answer in the affirmative. Fungal peritonitis is a very serious infection which invariab...
Do you consider the use of tocilizumab in patients with COVID pneumonia who have had an improvement in supplemental O2 requirements but have significantly elevated inflammatory markers after day two of remdesivir and dexamethasone?
I don’t use tocilizumab if the clinical condition is improving.
How do you decide between ceftolozane/tazobactam and ceftazidime/avibactam for empiric treatment of an infection due to difficult-to-treat Pseudomonas aeruginosa while awaiting additional susceptibilities?
Either is generally acceptable. The choice of empiric therapy in this circumstance may be dependent on additional information, if available. As an example, a patient with cystic fibrosis may have recent microbiological data that could guide the decision. Such information, however, is not often avail...
What is the role of anticoagulation in patients with septic thrombophlebitis?
The role of heparin anticoagulation in septic thrombophlebitis is controversial. There are limited to no randomized trials to document outcomes. A systematic review (Falagas et al., PMID 17222406) supported this practice, and the Infectious Disease Society also supports this practice. The role of or...
Would you treat a brain abscess due to S. anginosus longer than one caused by another organism?
Depending on the Clinical Picture, usually standard duration, but I once had a case with Strep anginosis abscess which started as a liver abscess, went on to be a pneumonia, then a brain abscess and also Thoracic Spine intramedullary abscess. I did 12 weeks of therapy. Repeat scans showed a mild dec...
Do you routinely perform echocardiography in patients with Staphylococcus aureus bacteremia deemed low risk for metastatic infection, or do you selectively omit it based on specific clinical criteria?
A limitation of the applicability of this study is that no isolates of MRSA were detected. Thus, there would be no strains, such as USA300-like strains, with both virulence and resistance mechanisms. In this situation, the goal is to avoid morbidity and mortality from a uniformly deadly disease: S. ...