Dr. Hooshmand received his medical degree from Shahid Beheshti University of Medicine in Tehran, Iran. He completed both his internal medicine residency and infectious disease fellowship at Ascension St. John Hospital and Medical Center in Detroit, Michigan.

Before specializing in infectious disease, Dr. Hooshmand worked as a hospitalist. He is board-certified by the American Board of Internal Medicine and in Infectious Disease.

Dr. Hooshmand has a passion for teaching and enjoys traveling and exploring nature in his free time.

After graduating from medical school in Syria, Dr. Youssef moved to the United States to pursue advanced training. She completed her internal medicine residency at St. Joseph Hospital in Ann Arbor, Michigan, and an infectious disease fellowship at Ascension Saint John Hospital in Detroit, Michigan.

In 2023, Dr. Youssef joined Comprehensive Infectious Disease of Nevada, bringing her extensive expertise to the community.

Dr. Youssef is married and has three children. Outside of work, she enjoys outdoor activities, cooking, and spending quality time with her family.

Dr. Chen grew up on the island of Hawaii and graduated from Midwestern University Osteopathic Medicine in Arizona. He completed his internal medicine residency in Parkersburg, West Virginia, and his infectious disease training at the University of Missouri.

After his training, Dr. Chen practiced infectious disease for three years in Reno, Nevada, before moving to Las Vegas in 2021. He has since established residency in Las Vegas and continues to provide high-quality patient care.

In his spare time, Dr. Chen enjoys hiking, golfing, traveling, snowboarding, and participating in bar trivia.

Dr. O'Reilly is a board-certified infectious disease specialist and internal medicine physician. His introduction to the medical field began as a combat medic for the US Army Reserve. He earned his undergraduate degree in microbiology from Cornell University, followed by a master's degree in medical science from Yale University, where he was awarded the prestigious Wilbur G. Downs Fellowship and conducted research on HIV and hepatitis C co-infection in Uganda.

Dr. O'Reilly received his MD and MPH from Tulane University, completed his residency at Columbia University, and his Infectious Diseases fellowship at UCLA. Since 2021, he has been practicing in Las Vegas, where he serves on the board of the Southern Nevada Infectious Disease Society.

He has a special interest in HIV care, NTM infections, transplant infectious diseases, and tropical medicine. Dr. O'Reilly is also passionate about medical education, teaching medical residents, lecturing at a nursing college, and hosting an infectious disease journal club.

Dr. Rajeev Fernando is a disaster medicine and infectious diseases specialist. Dr. Fernando completed his Disaster Medicine Fellowship at BIDMC/Harvard Medical School. He currently co-chairs the Infectious Diseases Special Interest Group (SIG) for the World Association of Disaster Emergency Medicine (WADEM).

Dr. Fernando also serves as Executive Director for Field Operations at the Society of Disaster Medicine and Public Health.  He managed critical COVID-19 cases across the world, including in the United States, India, Brazil, and Mexico. Dr. Fernando is a fashion designer and has showcased his work in New York, Paris and Cannes. All profits from his products help fund Chiraj humanitarian projects. Chiraj, founded by Dr. Fernando, focuses on assisting girls and women who have been trafficked in Iraq, Thailand, Colombia and will start a new operation in Los Angeles in 2026. Chiraj also focuses on projects empowering women in Brazil and India.

Dr. Fernando has successfully led, organized, and participated in numerous humanitarian/refugee missions, some of which include: Darfur, Sudan on mission with Doctors Without Borders (2008); The Rohingya refugee crisis in Bangladesh (2017); Türkiye earthquake disaster response (2023); Los Angeles wildfire disaster response (2025); and Hurricane Melissa response in Jamaica (2025).

Dr. Fernando has consistently been voted amongst New York’s best Infectious Diseases doctors. He has shared his medical opinions on networks including CNN, BBC and Fox News.

Mary Holstein is an Acute Care Nurse Practitioner with advanced clinical practice since 2021 and more than a decade of nursing experience. She began her career through the Army Medical Education Department, earning her Licensed Practical Nursing certification and serving six years on active duty in the United States Army. She completed her ADN at El Paso Community College, BSN at the University of Texas at El Paso, and MSN and DNP at Texas Tech University Health Sciences Center.

Mary is a board-certified Adult-Gerontology Acute Care Nurse Practitioner licensed in Nevada and Texas. She cares for medically complex adults in acute and high-acuity settings, managing conditions such as sepsis, advanced infections, respiratory and renal disease, and post-operative complications. She evaluates undifferentiated patients, orders and interprets diagnostics, and coordinates multidisciplinary care.

She is fluent in Spanish and provides culturally competent care to Spanish-speaking patients and families.

Ms. Lea Diola is a nurse practitioner specializing in Infectious Disease. She graduated Magna Cum Laude with Honors from the University of Arizona's Bachelor of Science in Nursing program, where she actively participated in research and was a member of the Research and Clinical Scholarship committee at the College of Nursing. Lea worked as a registered nurse for over 5 years before advancing her career as a nurse practitioner.

She earned her Doctor of Nursing Practice degree from the University of Arizona, focusing on Adult-Gerontology Acute Care. Lea is a member of both the American Association of Nurse Practitioners and the Infectious Disease Society of America. Outside of work, she enjoys traveling and is passionate about exploring different cuisines as an avid foodie.

Leilani P. Marcelino is a family and adult nurse practitioner specializing in infectious disease at Comprehensive Infectious Disease of Nevada. She completed her Bachelor of Science in Nursing at Silliman University and went on to earn her Master of Science degree at Charles R. Drew University of Medicine and Science in Los Angeles, California. Leilani holds a national certification with the American Academy of Nurse Practitioners.