Since we first opened in 1975 Dr. Diaz and his staff have provided high quality health service to the families of Brownsville and the entire Rio Grande Valley community. In a wave of growth, we have expanded our services to the Port of Brownsville area where board certified physicians and physician assistants can provide family care, occupational health, injury care, DOT drug screening, work related drug screens, laboratory blood work, transportation physicals, work physicals, x-rays, surgical procedures and much more. We are here to make sure you don’t miss work. Here families and workers can receive prompt, fast, and high-quality medical treatment.

Staff at The Port Occupational and Medical Clinic is devoted to deliver health care at the highest standard of care to all our patients. At The Port Occupational and Medical Clinic we believe in team work and we work hard to stay up-to-date to your needs. We have a team designed to attend Family and Occupational Medicine in as expedite manner, maintaining high quality and personal care to help you.


The Port Occupational and Medical Clinic strives in providing health for workers, safety at workplace, and quality of working environment.


The Port Occupational and Medical Clinic is dedicated at prevention and treatment of occupational injury, illness, and promote health and productivity of workers, their families, and the community in general.


Dr. Antonio M. Diaz, Jr. M.D

Is a well stablished and highly skilled Board Certified Physician with over 35 years of experience in Family Practice and Occupational Medicine. He is well regarded in the Brownsville and Rio Grande Valley community, earning numerous awards for his quality and patient centered care. Awarded Readers Choice Family Doctor of the year in 2012, 2014, 2017 and 2018. He is a compassionate doctor dedicated to the care of his patients.

Certified American Board of Family Medicine

Certified Medical Review Officer

Certified Senior Aviation Medical Examiner

Dr. Diaz specializes in Family Medicine, Occupational Medicine and Occupational Physicals.  He is a Health Provider in the areas of Preventive Care, Medical Care for Job Injuries, Workers Compensation, Department of Transportation Drug Screens (DOT Drug Screens), Department of Transportation Physicals (DOT Physicals), Aviation Physicals, Employment Physicals, Work Drug Screens, Company Physicals, Police Academy Physicals, Immigration Physicals, Traveler’s Physicals and Traveler’s Vaccines, Women’s Health, Flu vaccines, Pneumonia vaccines, Shingles vaccines.

Dr. Diaz is also affiliated to Valley Regional Medical Center and Valley Baptist Medical Center in Brownsville, Texas.

Clara Salazar PA.

Clara Salazar has been a Physician Assistant since 2006. She has lived in Brownsville Texas more than 30 years. Mrs. Salazar completed her Biology Degree at the University of Texas in Brownsville and Physician Assistant Degree at Pan American University in Edinburg Texas.  She has 3 children, is family oriented and she is an avid football fan, cross country, track and field fan.  She enjoys outdoor cooking with her husband like grilling steaks and smoking brisket for family and friends.

Mrs. Salazar expertise is in Family Practice, Occupational Medicine and Emergency Medicine.  Her focus is on preventive medicine, pediatrics, wellness exams, a variety of chronic conditions like Hypertension, Diabetes, High Cholesterol and many more.  Additionally, she has worked in Houston Texas at the Doctors Occupational Clinic, Deer Park Occupational Medicine and Express Occupational in Brownsville, Texas. She has performed pre-employment physicals, police academy physicals, traveler’s physicals, immigration physicals, compliance physicals such as DOT, and OSHA physicals as well as work related injuries like workers compensation. Lastly, her experience working in the emergency setting as a Physician Assistant at Ben Taub Hospital a level one trauma center in Houston Texas and as a Paramedic at UTRGV has earned her the confidence to promptly assess and treat emergency conditions.

Alberto S. Guajardo PA-C

Board Certified PA-C moved to Brownsville, Texas 6 years ago. He attended The University of Texas Rio Grande Valley where he was granted the Master’s in Physician Assistant. Alberto has ample experience in Family Practice and Preventive care and under Doctor Diaz one to one training. He is dedicated to Occupational Medicine, work prevention medicine, work injury treatment, work physicals, DOT physical examination, drug screening, company related physical exams, immigration physicals.

Alberto enjoys the outdoors in Brownsville and South Padre Island, loves all sports and history. He will to continue providing patient centered health care to every patient he encounters.