The Center for Microbial Medicine at CHOP

@centermicrobialmed.bsky.social

The Center for Microbial Medicine at the Children’s Hospital of Philadelphia is dedicated to finding cures and improving pediatric health through the lens of the microbiome. https://www.research.chop.edu/center-for-microbial-medicine

Congratulations to the newly minted Dr. @rinniehewlett.bsky.social on an amazing thesis defense!! Super proud of all you’ve accomplished exploring how nutrition and ecology shape susceptibility to C. diff. Excited to watch what’s to come next in the Tufts IRACDA Program and in Aimee Shen’s lab!!

BildZackular lab with blue hair

So excited to have been selected for this recognition by BWF PDEP and am ever more inspired to continue the work I have done and hope to do to follow in the footsteps of past and current mentor(s)!

Joe Zackular@joeyzacks.bsky.social · 2mo ago

Super proud of Zackular Lab postdoc @shealynicg.bsky.social for receiving @bwfund.bsky.social PDEP! This is well-deserved recognition of Nic's incredible work and potential.Thank you to @bwfund.bsky.social for supporting Nic and this amazing cohort of future leaders! www.bwfund.org/news/2026-po...

Researchers from @centermicrobialmed.bsky.social @chopresearch.bsky.social identify strategies for preventing the most infectious strains of Staph aureus. @pjplanet.bsky.social @ahmedmicrobes.bsky.social @qianxuan.bsky.social @joeyzacks.bsky.social

Children’s Hospital of Philadelphia, Penn Medicine Researchers Identify Strategies for Preventing the Most Infectious Strains of S. aureus in the NICU

A new study has identified which strains of Staphylococcus aureus – commonly known as staph – are commonly transmitted in neonatal intensive care units. A new study led by researchers at Children’s Hospital of Philadelphia (CHOP) and the Perelman School of Medicine at the University of Pennsylvania (Penn Medicine) has identified which strains of Staphylococcus aureus – commonly known as staph – are commonly transmitted in neonatal intensive care units and which specific strains are most likely to cause invasive and serious infections.The findings, published today in Nature Communications, offer a critical blueprint for precision surveillance of staph in the NICU and provide an important foundation for reducing infections in vulnerable newborns.Staphylococcus aureus is a bacterium often found on the skin and in the noses of healthy people. While usually harmless, certain strains can cause anything from mild skin infections to more serious bloodstream infections and pneumonia. A recent study found that one in four healthcare-acquired infections in very preterm U.S. infants were due to staph. Lakshmi Srinivasan, MD, FAAP As part of bi-monthly surveillance sampling at CHOP led by co-lead author Lakshmi Srinivasan, MD, an attending physician in the Division of Neonatology and the Pediatric Sepsis Program, nurses routinely swab the noses of babies in the neonatal intensive care unit (NICU) to test for the presence of these bacteria. However, there are currently no standard approaches for NICU surveillance of staph, and there is little evidence for when to begin or stop surveillance, how frequently to test, and which patients to closely monitor. Joseph P. Zackular, PhD “Staph is a critical human pathogen and a major cause of severe infection in our highest-risk infants,” said co-senior study author Joseph Zackular, PhD, a researcher in the Department of Pathology and Laboratory Medicine and Co-Director of the Center for Microbial Medicine at CHOP. “In this study, we brought together basic researchers, clinicians, and computational biologists in a highly collaborative effort to address a major challenge in pediatric health.”Utilizing expertise in CHOP’s NICU, the Center for Microbial Medicine, the Infectious Disease Diagnostics Laboratory, and the Microbiome Sequencing Center, researchers performed precision surveillance of invasive infections of staph in high-risk infants with the goal of identifying new strategies for prevention and control. Over three years, whole-genome sequencing showed that shared spaces and physical proximity were major drivers of staph transmission. Stable colonization by two types of staph, MSSA and MRSA, occurred across all areas within the NICU, and an analysis of more than 1,000 staph genomes revealed strain-specific persistence and colonization patterns, with MSSA causing more colonization and invasive disease than MRSA. Ahmed M. Moustafa, BPharm, PhD “Our study demonstrated that certain strains of staph pose significantly greater risk by being more transmissible and potentially more invasive, suggesting that a more effective prevention strategy might isolate and target the strains that cause the most infections,” said co-senior study author Ahmed M. Moustafa, BPharm, PhD, a researcher in the Division of Gastroenterology, Hepatology and Nutrition and Co-Director of the Center for Microbial Medicine at CHOP and the Sequencing Core Director of the CHOP Microbiome Center. Paul J. Planet, MD, PhD “This study provides a path forward for real-time interventions and improved surveillance that we hope can be implemented in NICUs around the country and improve the health and safety of preterm infants,” said co-senior study author Paul J. Planet, MD, PhD, an attending physician in the Division of Infectious Diseases at Children's Hospital of Philadelphia and Co-Director of the Center for Microbial Medicine at CHOP.This study was supported by the Center for Microbial Medicine at the Children’s Hospital of Philadelphia and National Institutes of Health grant 1R01AI185544.She et al, “Rapid dissemination of Staphylococcus aureus in the neonatal intensive care unit is associated with invasive infection.” Nat Commun. Online February 9, 2026. DOI: 10.1038/s41467-026-69074-z

chop.edu

Joe Zackular@joeyzacks.bsky.social · 6mo ago

Thrilled to share this study tracking Staph aureus carriage and transmission across the NICU using genomics! Work done w @pjplanet.bsky.social & @ahmedmicrobes.bsky.social and made possible by @centermicrobialmed.bsky.social. Study co-led by the amazing @qianxuan.bsky.social & Lakshmi Srinivasan!

Happy New Year, all! Reminder that the deadline for abstract selected talks is Jan 7th for @keystonesymposia.bsky.social meeting "Beyond Antibiotics: Emerging Strategies Combating Bacterial Infection." Register today and join us in Breckenridge!! It is going to be an awesome meeting!

Joe Zackular@joeyzacks.bsky.social · 9mo ago

Registration is now open for @keystonesymposia.bsky.social "Beyond #Antibiotics: Emerging Strategies Combating #BacterialInfection." Deadline for scholarships and abstract selected short talks is Jan 7! Join us this May for an amazing meeting! keysym.us/KSBeyondAntibiotics26 #KSBeyondAntibiotics26

The Center for Microbial Medicine at CHOP is delighted to be a sponsor for this important @keystonesymposia.bsky.social meeting on emerging strategies for combating AMR! Come find us at the meeting!

Joe Zackular@joeyzacks.bsky.social · 9mo ago

Registration is now open for @keystonesymposia.bsky.social "Beyond #Antibiotics: Emerging Strategies Combating #BacterialInfection." Deadline for scholarships and abstract selected short talks is Jan 7! Join us this May for an amazing meeting! keysym.us/KSBeyondAntibiotics26 #KSBeyondAntibiotics26

We are incredibly grateful for the generous support we have received for @centermicrobialmed.bsky.social. Support from these donors is allowing us to improve pediatric health through the lens of the microbiome and bring precision pathogen surveillance to reduce infections in children.

The Center for Microbial Medicine at CHOP@centermicrobialmed.bsky.social · 11mo ago

Donors Join Forces to Support Center for Microbial Medicine at Children’s Hospital of Philadelphia

Excited to share this collaborative study with @ritatamayo.bsky.social showing that E. faecalis influences C. diff morphology through the phase variable CmrRST system! This work was co-led by the amazing team of @ashleyweiss.bsky.social and Jilarie Santos-Santiago!

bioRxiv Microbiology@biorxiv-microbiol.bsky.social · last yr.

Enterococcus faecalis modulates phase variation in Clostridioides difficile https://www.biorxiv.org/content/10.1101/2025.07.24.666506v1

Incredibly honored to be selected as a @bwfund.bsky.social Investigator in the Pathogenesis of Infectious Disease. Thank you to @bwfund.bsky.social for supporting our work - I am thrilled to join this amazing community! And special thank you to my AMAZING team (past & present) for getting us here!

Burroughs Wellcome Fund@bwfund.bsky.social · last yr.

Announcing the 2025 Investigators in the Pathogenesis of Infectious Disease www.bwfund.org/news/announc... #bwfpath