A
- ABCs (Active Bacterial Core surveillance)
- Abdominal Aortic Aneurysm — see Aortic Aneurysm
- ABLES (Adult Blood Lead Epidemiology and Surveillance)
- Abortion Surveillance
- Abrasive Blasting
- Abuse, Child — see Child Maltreatment
- Abuse, Elder — see Elder Maltreatment
- AC (Hydrogen cyanide)
- Acanthamoeba Infection
- Accreditation — see Health Department Accreditation
- ACE (Adverse Childhood Experiences)
- Acinetobacter Infection
- ACIP (Advisory Committee on Immunization Practices)
- ACIP Recommendations
- Acquired Immune Deficiency Syndrome (AIDS) — see HIV
- Acquisition
- Acrylamide
- Acrylonitrile
- Active Bacterial Core surveillance (ABCs)
- Acute Flaccid Myelitis (AFM)
- Adenovirus Infection
- Adenovirus Vaccination
- ADHD [Attention Deficit/Hyperactivity Disorder]
- Adolescent Health
- Adolescent Pregnancy — see Teen Pregnancy
- Adult Blood Lead Epidemiology and Surveillance (ABLES) — see Blood Lead Levels
- Adult Vaccinations
- Advanced Molecular Detection (AMD)
- Advancing Excellence & Integrity of CDC Science — see Science
- Adverse Childhood Experiences (ACE)
- Adverse Drug Events — see Medication Safety
- Adverse Events Following Immunization — see Vaccine Adverse Event Reporting System
- Advisory Committee on Immunization Practices (ACIP)
- Advisory Committees - see Federal Advisory Committees
- Aerosols
- Afghanistan
- AFib, AF (Atrial fibrillation)
- AFIX Immunization Strategy
- AFM
- African Trypanosomiasis — see Sleeping Sickness
- Agents, Chemical — see Chemical Agents
- Aging
- Aging in the Workplace
- Agricultural Safety — see Farm Worker Injuries
- AHF (Alkhurma hemorrhagic fever)
- AIDS (Acquired Immune Deficiency Syndrome)
- Air
- Air Pollutants
- Air Quality
- Alcohol
- Binge Drinking
- Drinking & Driving
- Excessive Alcohol Use
- Fetal Alcohol Spectrum Disorders
- Underage Drinking
- Alcohol & Pregnancy
- Alkhurma hemorrhagic fever (AHF)
- ALS [Amyotrophic Lateral Sclerosis]
- Alzheimer's Disease
- AMD (Advanced Molecular Detection)
- Amebiasis, Intestinal [Entamoeba histolytica infection]
- American Samoa
- American Trypanosomiasis — see Chagas Disease
- Ammonia
- Amphibians and Fish, Infections from — see Fish and Amphibians, Infections from
- Amyotrophic Lateral Sclerosis — see ALS
- Anaphylaxis — see Food Allergies in Schools
- Anaplasmosis, Human
- Ancylostoma duodenale Infection, Necator americanus Infection — see Human Hookworm
- Angiostrongylus Infection
- Angola
- Animal-Related Diseases
- Animal and Animal Product Importation — see Importation of Animals, Animal Products
- Animal Product Importation — see Importation of Animals, Animal Products
- Animal Welfare
- Anisakiasis — see Anisakis Infection
- Anisakis Infection [Anisakiasis]
- Anthrax Vaccination
- Anthrax [Bacillus anthracis Infection]
- Anthropometry
- Antibiotic-resistant Infections - Listing
- Antibiotic and Antimicrobial Resistance
- Antibiotic Stewardship
- Antibiotic Use, Appropriate
- see also Get Smart about Antibiotics Week
- Antimicrobial Stewardship — see Antibiotic Stewardship
- Antimony
- Antineoplastic Agents
- Aortic Aneurysm
- Aortic Dissection — see Aortic Aneurysm
- Arenavirus Infections
- Argentina
- Armenia
- ARRA — see Recovery Act
- Arsenic
- Arsine
- ART (Assisted Reproductive Technology)
- Arthritis
- Childhood Arthritis
- Fibromyalgia
- Gout
- Osteoarthritis (OA)
- Rheumatoid Arthritis (RA)
- Asbestos
- Ascariasis — see Ascaris Infection
- Ascaris Infection [Ascariasis]
- Aseptic Meningitis — see Viral Meningitis
- Aspergillosis — see Aspergillus Infection
- Aspergillus Infection [Aspergillosis]
- Asphalt Fumes
- Assisted Living Facilities, Infection Prevention in — see Long-Term Care Facilities, Infection Prevention in
- Assisted Reproductive Technology (ART)
- Assurance of Confidentiality — see Certificate of Confidentiality
- Asthma
- Asthma and Community Health
- Asthma and Influenza
- see also Influenza
- At-Risk — see Social Vulnerability Index
- Atrial fibrillation (AFib, AF)
- Attention Deficit/Hyperactivity Disorder — see ADHD
- Autism
- see also Genetics and Genomics
- Autism and Thimerosal — see Thimerosal (Mercury) and Vaccines
- Avian Influenza
- Aviation in Alaska, Commercial
- Azerbaijan
