Infectious Disease
Expert guidance on antimicrobial stewardship, emerging infections, and complex infectious disease management.
Recent Discussions
Have you used Karius to aid in the diagnosis of a non-resolving pneumonia, with negative bronchoscopy, biopsy, and other infectious work up in an immunocompetent patient?
Culture-negative hospital-acquired pneumonia is approximately 50%. Positive cultures are complicated by having to correlate results clinically as organisms may contaminate specimens (even if from a protected brush) and include an organism that doesn't even cause pneumonia, such as Enterococcus spp. ...
How do you approach treatment of RA with methotrexate in a patient with treated Hepatitis C and normal liver function?
Active hepatitis C infection can be present in the setting of normal liver function tests. So, I always check for the viral load, especially if the hep C treatment was done more than a few years ago. Here, the old alpha interferon-based treatments achieved a cure rate no better than 30%. The newer a...
For which pediatric oncology patients do you start bacterial prophylaxis, inpatient or outpatient, and what is your antibiotic of choice?
Bacterial prophylaxis in pediatric oncology patients should be guided by the intensity of treatment, depth and duration of neutropenia, and individualized risk for invasive infection. Current evidence and expert consensus support targeted prophylaxis in children with the highest risk of life-threate...
How do you approach DMARD therapy in patients with rheumatoid arthritis and chronic hepatitis B?
Patients with hepatitis B core positivity, surface antigen positivity, and positive PCR for viral DNA, should be treated with entecavir prior to starting any DMARD. Given the DNA PCR is positive too, that indicates active viral replication and they may need treatment for a while before starting anyt...
When do you consider repeating CSF studies in a patient with suspected viral encephalitis but overall initially unrevealing CSF?
Definitely not an expert on this topic, but this situation does come up, particularly for HSV encephalitis! One question worth asking your lab is what kind of assay are they using to run this test. If it's a dedicated HSV PCR assay (e.g., Simplexa), then the sensitivity is going to be quite robust, ...
How do you approach ongoing screening for TB in patients with a history of treated latent TB, but who have ongoing use of DMARDs and/or biologics given Quantiferon testing and PPD can remain positive?
Interferon-release assays (such as Quantiferon) and PPD testing do not discriminate between infection, reinfection, and prior infection with TB. However, in most developed countries, the likelihood that a patient who has once been treated for LTBI becomes reinfected and develops LTBI again is low, i...
Would you use the pneumococcal conjugate-21 vaccine (Capvaxive) instead of the conjugate-20 (Prevnar-20) for routine vaccinations in immunosuppressed patients?
PCV-21 was recently approved by the FDA and supported by ACIP. At this early stage (August 2024), CDC has not finalized guidance on PCV-21, so we do not know how the vaccine schedule will be changed. An important distinction is that PCV-21 covers different serotypes of pneumococcus, as outlined in t...
Is the combination of a negative BAL PJP PCR and normal fungitell enough to rule out PJP pneumonia in an at-risk non-HIV patient?
Yes
How do you counsel patients and doctors on antibiotic avoidance in myasthenia gravis?
I generally recommend avoiding aminoglycosides and most macrolides in MG. The rationale is that there are alternative effective antibiotics for most of the infections covered by the above categories. With fluoroquinolones, however, it's not that simple, because there are some infections that are uni...
For how long do you treat an early spinal hardware infection secondary to MSSA after operative washout and retention of hardware?
This infection is a key research interest of mine and one I'm deeply passionate about. I typically treat with a 12-week induction regimen, preferably using antibiofilm-active agents—an approach adapted from the DATIPO trial for prosthetic joint infections (PJI). I generally do not recommend routine ...