Left to right: Amelia, Eliana, Ana, Susan, Denise

Ana A. Weil, MD, MPH

Principal Investigator
Ana is originally from Fairbanks, Alaska, but spent most of her time growing up on a small farm in Washington. She worked in infectious disease research and public health, primarily in Africa, prior to attending medical school. She became interested in cholera research after spending one year in the laboratory of Dr. Firdausi Qadri at the International Centre for Diarrheoal Disease Research, Bangladesh, in 2008. She lives in Seattle with her family.

Denise Chac, PhD

Staff Scientist
​Denise is a postdoctoral researcher with a background in microbiology and immunology. Denise has always been dealing with poop - first studying how the primate gut aids in seed dispersal for her undergraduate honors thesis, then analyzing the gut microbiota of mice with different diets and infections, and now investigating the human microbiota and cholera. Outside of lab, Denise’s passion is random DIY projects and playing board and video games.

Anthony Luong

Undergraduate researcher
​Anthony is an undergraduate student majoring in Biochemistry at the University of Washington and is originally from Vietnam. He is on the pre-med track with the goal of becoming a physician. His research interests focus on how environmental factors and the gut microbiome influence disease outcomes, with the goals of improving prevention strategies and overall health. Outside of school and the lab, he enjoys cooking, traveling to new countries, exploring different cuisines, and singing car karaoke with friends.

Pawan Grewal

Undergraduate Researcher
​Pawan is a pre-med undergraduate majoring in Biology at the University of Washington. He is passionate about pursuing a career in medicine and exploring how science can be applied to improving patient care. Volunteering in Guyana deepened his curiosity about how research can drive disease prevention and expand access to effective healthcare. Outside of academics, he likes to snowboard, hike with friends, and listen to new music.

Open positions at the Weil Lab! 
Please contact Ana at [email protected]



Postdoctoral Student - we are hiring!
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Pathobiology Graduate Students
(Department of Global Health)
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Undergraduate positions

Lab Alumni

Susan Markiewicz
  • Currently: hiking !
  • Weil Lab Position: Research Scientist/Engineer I (2022-2026)
  • Weil Lab Project: Emerging Pathogens Initiative; ETBF; 
Amelia Rice
  • Currently: Undergraduate at Barnard University
  • Weil Lab Position: Undergraduate researcher, summer 2024 and 2025
  • Weil Lab Project: Single ChromosomeVibrio cholerae virulence
Eliana Diep
  • Currently: Dental student at the University of Pennsylvania
  • Weil Lab Position: Undergraduate researcher, 2025
  • Weil Lab Project: Aerobic and Anaerobic microbial nitrate/nitrite production
Joyce Liu
  • Weil Lab Position: Undergraduate researcher, 2024
  • Weil Lab Project: Vibrio cholerae interaction with Paracoccus aminovorans, microbe identification
​Gwen ​Dumayas​
  • Currently: Molecular Laboratory Technician at GenScript
  • Weil Lab Position: Undergraduate researcher, 2021-2024
  • Weil Lab Project: Vibrio cholerae gene expression, microbe identification
Mirra Chinta
  • Currently: Undergraduate, University of Washington​
  • Weil Lab Position: Summer student, 2023
  • Weil Lab Project: Bacteroides uniformis microbiology
Kristine Tandoc
  • Currently: Pathobiology PhD Student at University of Washington​
  • Weil Lab Position: Graduate Rotation Student, 2023
  • Weil Lab Project: Toxin co-regulated pilus phenotype of Vibrio cholerae with genetic mutations
Chelsea Dunmire
  • Currently: Research Associate at Outpace Bio
  • Weil Lab Position: Research Scientist, 2020-2022
  • Weil Lab Project: Isolation of anaerobic bacteria, investigating Vibrio cholerae genomic evolution between the upper and lower gastrointestinal tract
Emerson Smith
  • Currently: UC Berkeley Masters in Public Health, Infectious Disease and Vaccinology
  • Weil Lab Position: Summer Undergraduate Lab Assistant, 2022
  • Weil Lab Project: Vibrio cholerae evolution during household transmission of cholera
Patricia Silva-Ramirez
  • Currently:​ Dental School in San Juan, Puerto Rico
  • Weil Lab Position: PREP NIH Scholar - Post-baccalaureate student, 2021-2022 
  • Weil Lab Project: Interactions between Vibrio cholerae and Rothia mucilanginosa​
Fred Heller, MD
  • Currently: Psychiatry Resident Mount Sinai Hospital, New York City
  • Weil Lab Position: Medical Student Researcher (from Duke University), 2020-2021
  • Weil Lab Project: Metagenomic data analysis for identification of bacterial strains correlated with protective immunity to oral cholera vaccination
Meti ​Debela, MD​​
  • Currently: Anesthesia resident at Yale University - New Haven Medical Center
  • Weil Lab Position: Research Technician, 2016-2019
  • Weil Lab Project: Interactions between Vc and Paracoccus aminovorans​
Alaina Ritter, MD
  • Currently: Assistant Professor at University of Florida
  • Weil Lab Position: Postdoctoral Researcher, 2017-2019​
  • Weil Lab Project: Innate immune responses generated by human duodenal enteroids in Vibrio cholerae infection
Purva Patel, MD
  • Currently: Resident Physician, University of Indiana
  • Weil Lab Position: Undergraduate Researcher, 2017​
  • ​Weil Lab Project: Vibrio cholerae virulence expression in the setting of Vc-host microbe co-culture measured by qPCR
Emma Krolicki
  • Currently: Data Analyst Intern at International Packaging Corporation
  • Weil Lab Position: Undergraduate Researcher, 2018​
  • Weil Lab Project: Isolation of anaerobic bacteria from stool of cholera patients and their household contacts