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. Keswani earned his medical degree from Ross University School of Medicine before completing his Internal Medicine residency through the Sunrise Graduate Medical Education Consortium at MountainView Hospital and Medical Center in Las Vegas, Nevada. During his residency, he developed a strong interest in point-of-care ultrasound and the management of infectious diseases in critically ill patients.

He went on to complete his fellowship in Infectious Diseases at Ochsner Clinic Foundation in New Orleans, Louisiana, where he received extensive training in transplant infectious diseases and the management of immunocompromised patients. During the final phase of his fellowship, he also completed an elective rotation at National Jewish Health in Denver, Colorado, a nationally recognized center specializing in respiratory and immunologic diseases.

Dr. Keswani is board-certified in both Internal Medicine and Infectious Disease. His clinical interests include non-tuberculous mycobacterial (NTM) infections, infectious diseases in critically ill patients, transplant infectious diseases, antimicrobial stewardship, and the management of immunocompromised hosts.

Outside of medicine, Dr. Keswani enjoys playing the piano, participating in Bollywood dance, and spending time with family and friends.

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.

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.

Maggie Lauer, MSN, APRN, FNP-C is a board-certified Family Nurse Practitioner dedicated to delivering compassionate, evidence-based care to patients across the lifespan. She earned her Bachelor of Science in Nursing from Youngstown State University and her Master of Science in Nursing from Chamberlain University.

Before becoming a Family Nurse Practitioner, Maggie worked as a critical care charge nurse in a medical intensive care unit, where she gained extensive experience caring for patients with complex acute and chronic medical conditions. Her background in critical care has equipped her with the clinical expertise to manage a wide range of medical conditions while maintaining a calm, patient-focused approach.

Maggie is passionate about preventive medicine, patient education, and empowering individuals to take an active role in their healthcare. She believes in developing meaningful relationships with her patients and providing personalized, collaborative care tailored to each individual's unique needs and goals. By combining clinical excellence with a compassionate approach, Maggie strives to help every patient achieve their best possible health outcomes and improve their overall quality of life.

Aaron Lunario, MSN, APRN, FNP-C is a board-certified Family Nurse Practitioner committed to delivering compassionate, evidence-based care to patients with complex medical conditions.

Aaron earned his undergraduate nursing degree from the University of Santo Tomas in the Philippines. During his nursing education, he volunteered with the Philippine Red Cross and participated in numerous medical missions through both the Red Cross and Lions Clubs International, experiences that strengthened his commitment to community service and patient-centered care.

Prior to becoming a Nurse Practitioner, Aaron gained approximately eight years of diverse nursing experience in bedside nursing, case management, charge nursing, and wound care. This extensive clinical background provided him with the knowledge and skills to care for patients across a variety of healthcare settings.

He went on to earn his Master of Science in Nursing – Family Nurse Practitioner from Charles R. Drew University of Medicine and Science. After graduation, Aaron practiced as a hospitalist Nurse Practitioner for two years before joining APEX Infectious Disease Specialists, where he provides comprehensive, evidence-based care for patients with infectious diseases and other complex medical conditions.

Outside of work, Aaron enjoys fishing, traveling, and photography. He values spending time outdoors, exploring new places, and capturing memorable moments through the lens of his camera.

Valentina Staleva, MSN, APRN, FNP-C is a board-certified Family Nurse Practitioner who combines a strong critical care foundation with a empathetic, patient-centered approach to caring for patients with infectious diseases and complex medical conditions.

Valentina earned her Bachelor of Science in Nursing from Nevada State College and her Master of Science in Nursing – Family Nurse Practitioner from the University of Nevada, Las Vegas.

Originally from Bulgaria, Valentina immigrated to the United States as a child and was raised in Las Vegas. Fluent in both Bulgarian and English, she is passionate about serving the community that shaped her, educating her patients, and providing personalized, high-quality care.

Prior to becoming a Nurse Practitioner, Valentina spent five years as a critical care and relief charge nurse in a cardiac intensive care unit, assisting patients with complex medical conditions. This experience strengthened her clinical judgment, leadership skills, and commitment to exceptional patient care.

Outside of work, Val enjoys spending time with family and friends. She loves traveling, snowboarding, discovering new dining experiences, and creating lasting memories.